cashco 521 Instruction manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
Model 521
with ATO - FC Actuator
SECTION II
ABBREVIATIONS
SST.......... Cast or Wrought Stainless Steel
HC ........... Wrought Hastelloy C-276
ATO-FC ... Air-to-Open, Fail Close
ATC-FO ... Air-to-Close, Fail Open
CCW........ Counter Clockwise
CW........... Clockwise
D or DIR... Direct Acting
R or REV.. Reverse Acting
IAS........... Instrument Air Supply
IOM.......... Installation, Operation and Maintenance
Manual
SIG .......... Output Signal from Instrument
LOAD....... Positioner Output Air Pressure
V .............. Vent
IOM-521
02-20
MODEL 521
TOTAL TFE, GLOBE-PATTERN CONTROL VALVE
BODY IOM
SECTION I
I. DESCRIPTION AND SCOPE
The Model 521 is a bellows sealed, globe-style control
valve fabricated from a tee-block of isostatically
compacted virgin TFE. Sizes are 1/2", 1", 1-1/2" and
2". The split body jacket is CF8 (304 SST) material.
All wetted internal parts are of isostatically compacted
TFE material. The standard stem material is of 316
SST; two optional Hastelloy C-276 stem material
constructions are available.
End connections are available to mate with 150#,
300# or DIN PN16, 25 or 40 flanges. Each flange
is drilled and tapped to receive stud bolting only.
The valve is designed for chemical service with fluids
that are normally corrosive to metallic materials.
For application pressure vs. temperature zone refer
to Model 521-TB, Graph No. 1 (pg. 3).
Actuators that may be mounted to a Model 521
body are Cashco Model C27 or Model C53, both
field reversible.
II. REFERENCES
Refer to Technical Bulletin 521-TB for complete
technical specifications of a Model 521 coupled with
either Cashco Actuator C27 or C53.
www.cashco.com/techbulletins/521.pdf
Refer to following Installation, Operation &
Maintenance Manuals (IOM’s) for either actuator
and/or devices that maybe mounted to a Model 521:
Actuators: www.cashco.com/IOM/C27-C53.pdf
Positioners:
P/P: www.cashco.com/techbulletins/9540l.pdf
I/P: www.cashco.com/techbulletins/srd991.pdf
I/P: www.cashco.com/iom/PS2iom.pdf
ISO Registered Company

IOM-5212
III. INSTALLATION
A. Orientation
1. Recommended orientation when installed
is in a horizontal pipeline with the stem
vertical. Valves may be installed in a vertical
or horizontal pipeline with the stem between
vertical and horizontal.
2. Outdoors, all installations may be oriented
at any angle from horizontal-to-vertical, as
per A.1. above.
3. Model 521 valves should not be installed
with the stem oriented below horizontal/
downwards.
4. In no case is additional weight to be applied
to the actuator assembly when installed in
an orientation other than vertical.
8. Undue piping stress/strain or bending
torques may not be transmitted through
the control valve body. One pipe (inlet
or outlet) should be anchored rigidly for
piping that is “hot” or “cold” with respect to
SECTION III
Figure 2: Body Insulation
B. Piping System
1. It is recommended that the control valve
unit be installed with a double-block and
bypass as indicated in Figure 1. This
arrangement is recommended especially
where maintenance will be done on the valve
body while still installed in the pipeline.
2. If pipe reducers are located before and/or
after the valve body, keep the reducers as
close as practical to the valve body; this is
especially important where the reducers are
more than one line size larger than the valve
body size, which is common in gaseous
service.
3. Clean the piping of all foreign debris,
including chips, weld scale, weld splatter,
oil, grease, sand or dirt prior to installing
the control valve; THIS IS AN ABSOLUTE
REQUIREMENT.
4. Field hydrostatic testing the completed
piping system, including the Model 521,
to 1-1/2 x CWP indicated on Model 521
nameplate is acceptable. If hydro test
pressure exceeds the 1-1/2 x CWP limit,
the 521 must be removed for such testing.
Before pressurization, the valve plug should
be lifted from the seat if of reverse, ATO-FC
action.
5. Flow Direction: Install so the flow direction
matches the arrow cast on the valve body.
6. Valves are not to be direct buried
underground.
7. Insulation may be applied as indicated in
Figure 2. Drainage from the packing area
must be ensured when fully installed, sealed
and lagged for outdoors installation. Vented
pipe plug (12) should not be covered.
WARNING
The valve/actuator unit should not be used as a
“step” to support personnel. Failure to comply
may cause leakage at the bonnet/body joint,
allowing possible contact with harmful fluids.
Figure 1: Typical Control Valve Station

IOM-521 3
12. Tighten flange stud nuts uniformly in a
crossing pattern. Ensure flange facing
alignment. Do not use flange bolting to “pull”
flanges into alignment. Tighten flange bolting
to torque levels of Table 2 in increments of
1/2 revolution to ensure uniform loading of
valve’s raised facing.
ambient temperature; the remaining pipe
(inlet or outlet) should be supported and
guided to ensure unidirectional expansion/
contraction. Properly align prior to installing
valve with required flange bolting.
9. The Model 521 is designed for a flanged
connection that is gasketless. The raised
face portion of end connection flange serves
as the gasket.
10. An ANSI/DIN adapter gasket (17) is supplied
with all Model 521 valves provided with DIN
16/25/40 end connections. See Figure 3.
The purpose of this adapter gasket (17) is
to ensure proper compression of the body’s
TFE core (1.2) when used with DIN piping.
To assist during installation, place pipe
thread sealant on one side of adapter gasket
(17), and press the sealant covered side of
the adapter gasket over the exposed TFE
of the body core (1.2) end connection. The
sealant will hold the adapter gasket (17)
to its proper location prior to joining with a
piping flange.
NOTE: If the installed Model 521 has had
the flange bolting over-torqued, distortion
of TFE core (1.2) will occur. If dimension
“X” in Figure 4 is 0.040" (1 mm) or less, a
gasket is recommended upon reinstallation.
If dimension “X” is less than 0.020" (0.5 mm),
body replacement is recommended.
Figure 3: ANSI/DIN Adapter Gasket
11. Flange bolting must be of the stud-type. Each
flange is drilled and tapped to accept studs.
The studs should be of a length to penetrate
the full depth of the bolt hole through the
flange; DO NOT USE STUDS/BOLTS OF
TOO SHORT LENGTH. See Table 1 for
stud size/thread/length requirements.
TABLE 1
Body Size End Connection Flange Bolting
In. (DN) 150# 300# DIN 16/25/40
1/2" DN15 1/2" Ø - 1-3/4"
13 UNC-2B
1/2" Ø - 1-3/4"
13 UNC-2B
14 mm Ø - 45 mm
M12x1.75-6H
1" DN25 1/2" Ø - 2"
13 UNC-2B
5/8 Ø - 2"
11 UNC-2B
14 mm Ø - 52 mm
M12x1.75-6H
1-1/2" DN40 1/2" Ø - 2-1/2"
13 UNC-2B
3/4" Ø - 2-3/4"
10 UNC-2B
18 mm Ø - 70 mm
M16x2.0-6H
2" DN50 5/8" Ø - 2-1/2"
11 UNC-2B
5/8" Ø - 2-3/4"
11 UNC-2B
18 mm Ø - 70 mm
M16x2.0-6H
No. Bolt Holes 4 4 or 8 * 4
* 2" - 300 # requires 8 bolt holes; all others 4.
TABLE 2
Body Size End Connection Flange Bolting
In. (DN) ANSI-150 ANSI-300 DIN 16/25/40
1/2" DN15 10 - 12 ft-# 10 - 12 ft-# 15 - 18 N-m
1" DN25 10 - 12 ft-# 12 - 14 ft-# 21 - 25 N-m
1-1/2" DN40 10 - 12 ft-# 14 - 17 ft-# 18 - 22 N-m
2" DN50 35 - 40 ft-# 17 - 20 ft-# 50 - 60 N-m
Figure 4: End Connection - Partial Section

IOM-5214
SECTION IV
IV. STARTUP
A. General:
1. Ensure that the Model 521 unit has been
properly adjusted and calibrated, including
the positioner, if installed.
2. Recommend startup to be in “manual”
mode. This procedure assumes double
block (isolation) and bypass valves for the
“control valve station" per Figure 1.
3. Start with either of the two block valves
closed, with the other open. The bypass
valve should be closed. Pressurize system
if possible/practical.
4. Back out the airset’s adjusting screw until
loose.
5. Turn on air supply pressure.
6. Adjust the air supply airset (filter-regulator) to
the proper level as indicated in the technical
bulletin 521-TB. DO NOT STROKE THE
CONTROL VALVE WITH AN AIR SUPPLY
PRESSURE SETTING GREATER THAN
RECOMMENDEDMAXIMUMPRESSURE!
7. Place loop controller into “manual” mode.
Vary setting from minimum – mid-range—
maximum SIG output. Observe response of
control valve unit to these changes of input
SIG. The valve should fully stroke at the
variation from minimum SIG to maximum
SIG; the mid-range SIG should have the
valve stem travel at/near 1/2 open.
8. Confirm that action of controller and
positioner – direct or reverse – are producing
the desired response in the control unit.
Confirm that the control valve “fail” position
is as required.
9. Hereafter, the procedure assumes that
actual fluid flow may be established. This
may not be practical/possible in all cases;
if so, vary procedure as required.
Always “heat” or “cool” down the system
piping SLOWLY by opening the control valve
station bypass valve in small increments.
10. With one of the control valve station block
valves still closed, and the loop controller
still in “manual” mode, open bypass valve
and vary flow rate manually to observe the
response of the controller and control valve
unit together.
11. Attempt to develop manual control of the
loop by opening/closing the manual bypass
as required, or by manually controlling
mainstream flow as required.
12. When the control valve is partially open,
crack open, slowly, the closed block valve
while simultaneously closing the bypass
valve; it may be necessary/desirable to
vary the manual output SIG from the
controller simultaneously also. Continue
this procedure until the bypass is closed
and the block valves are both fully open.
The system is still under “manual” mode
control, but all flow is passing through the
control valve.
C. Auxiliary Detection:
1. When a fluid is known to permeate TFE over
a finite time period and the fluid is lethal
or is subject to stringent limits of fugitive
emissions, the vented pipe plug (12) should
be removed and one of, or a combination of,
the following methods should be considered
to monitor the integrity of the internal primary
stem (9) seal – the bellows sub-assembly
(8):
a. gas detector with alarm
b. pressure indicating gauge
c. pressure switch with alarm
d. inert gas, constant flow purge.
CAUTION
DO NOT WALK AWAY AND LEAVE A MANUALLY
CONTROLLED CONTROL VALVE UNATTENDED!
13. Vary controller “manual” SIG output until
matching the “automatic” SIG output, then
change the mode of the controller over to
“automatic”, and the loop will experience a
minimum of upset conditions, and will be in
automatic control.

IOM-521 5
A. General:
1. Once fluid pressure has been isolated by
block valves, and piping flange bolting has
been only loosened, carefully remove vented
pipe plug (12) from the bonnet (2), applying
the detection procedures of C. 1. above, as
a small quantity of fluid may be “trapped” in
the void space of the bellows (8) interior due
to permeation. The plug (12) has a “groove”
notched in its threads to assure venting prior
to the threads fully disengaging. Once fully
vented and/or purged as required by safety
procedures, reinstall the plug (12) using a
fluid compatible lubricant . DO NOT USE
THREAD SEALANT FOR VENTED PIPE
PLUG (12) ON REINSTALLATION.
2. Maintenance procedures hereinafter are
based upon removal of the valve/actuator
unit from the pipeline where installed.
3. Owner should refer to Owner’s procedures
for removal, handling and cleaning of
nonreusable parts and suitable solvents,
etc.
4. Valves supplied from the factory do not
use any sealing aids for the gasket such
as oil, sealant, or pipe dope in the wetted
portions of the valve body assembly. Sealing
aids should not be required and are not
recommended.
5. All indicated Item Numbers that are with
respect to actuator assembly (AA) will be in
parenthesis and underscored; i.e. (20). All
Item Numbers that are with respect to the
body assembly (BA) are not underscored;
i.e. (32). Reference with respect to the
positioner is in double parentheses; i.e.
((AP)).
V. MAINTENANCE
WARNING
Model 521 control valves frequently are installed
in hazardous/lethal fluid services. Before removal
from pipeline or any level of disassembly,
consult the Owner’s safety procedures for
proper flushing, cleaning and handling of a
valve exposed to potentially hazardous fluids
during de-pressurization and removal. Owner's
safety procedures preempt any statements or
recommendations contained in this IOM.
Figure 5: Pressure Boundry Testing Configuration
SECTION V
6. The stem sub-assembly (9) is designed
for non-rotation when installed. DO NOT
ATTEMPT TO ROTATE WITH THE STEM
SUB-ASSEMBLY INSTALLED; FAILURE
TO HEED MAY CAUSE DAMAGE TO THE
STEMSUB-ASSEMBLY(9),THEBELLOWS
SUB-ASSEMBLY (8), THE PLUG (3) AND/
OR THE BODY ASSEMBLY(1). Exhibit
special care when handling the stem (9)
surface where it contacts the packing (6).
B. Pressure Boundary Leakage Shop Test:
1. Secure the body assembly (BA) in a vise
with the valve stem (9) oriented vertically.
2. Remove vented pipe plug (12).
3. Install a pipe nipple, test pressure gauge and
isolation valve into the 1/8"-NPT (female)
opening. (See Figure 5.)
4. Place a suitable adhesive tape (“duct tape”)
around the perimeter of the bonnet/body
flange. Place tape on the “joint lines” of the
shell halves (1.1) (see Figure 10). Place blind
flanges over the flanged end connections
and bolt down; one of the blind flanges must
have a hole through the face; place tape
over the opening of the blind flange.
5. Using a source of acceptable fluid such as
nitrogen gas, pressurize the bellows “void
zone” to 30 psig (2.1 Barg). Tightly close off
the isolation valve of 3. above. Disconnect
the pressure source.
6. Poke small holes in the tape at the bonnet/
body flange and at the opening in the blind
flange.

IOM-5216
6. Loosen stem nut (20) by rotating nut CW
(viewed from above) to base of threads.
7. Loosen packing (6) by turning packing gland
nut (5) CCW 2-3 revolutions.
8. Rotate yoke nut (15) CCW to fully loosen
nut.
9A. For ATO-FC Reverse Action Actuators:
a. Connect a temporary air source
to the actuator and pressurize the
actuator to upper limit of the bench
range specified on the valve name
plate. (Pressure will lift the plug head
(3) away from the body's (1) integral
seat until the plug (3) is 100% open.)
b. Place a wrench on the hex surface
of the swivel lower knuckle (44) and
rotate knuckle CCW (viewed from
above actuator) until lower knuckle dis-
engages from stem (9). Keep track of the
number of full revolutions to dis-engage
and record here. _______________
c. Maintain lift support from above the
7. For units with Reverse Action (ATO-FC)
actuators pressurize to a level sufficient to
initiate travel to approximately mid-stroke
to hold the plug (3) away from the body (1)
seat.
8. Apply leak detection fluid to all the potential
leak paths:
a. Packing gland nut (5). (Tighten as
necessary.)
b. Body (1)-to-bonnet (2) flange tape hole.
c. Body (1) and bonnet (2) bolting (13, 14,
1.3, 1.4, 1.5).
d. End connection blind flange tape hole.
e. Test pressure piping connections.
9. If leakage occurs at:
a. a. above, there is a packing (6) or a
packing (6) /stem sub-assembly (9)
failure.
b. b. above, there is a bonnet gasket (11)
failure.
c. c. above, there is a bonnet gasket (11),
or TFE core (1.2) failure.
d. d. above, there is a bellows sub-assembly
(8) failure.
10. Following this test procedure may help
to solve maintenance problems when
combined with visual examination of
disassembled body assembly (BA).
C. Separation of Body/Actuator:
1. Reference the Actuator IOM-C27-C53 for
item number call outs and drawings for
actuator.
2. Secure the body in a vise with the actuator
assembly (AA) oriented vertically. Place
matchmarks between the body (1) bonnet
flange, the bonnet (2) flange, and the yoke
(3) to assist in final orientation when the
body is disassembled and/or the actuator
removed. If actuator has handwheel - see
Actuator IOM for removal instructions.
3. Secure and rig the actuator assembly (AA)
for a vertical lift using an overhead hoist.
Remove slack from rigging.
4. This procedure assumes that the body
assembly (BA) has been fully assembled
through the bonnet (2), including the packing
gland nut (5) and packing (6).
5. Remove vented pipe plug (12) from body.
Figure 6: Swivel-Type Connector
actuator assembly (AA). Dis-engage
(slide) the swivel lower knuckle (44) out
of the upper knuckle (43) slot.
9B. For ATC-FO Direct Action Actuators:
a. Place a wrench on the hex surface
of the swivel lower knuckle (44) and
rotate knuckle CCW (viewed from
above actuator) until lower knuckle dis-
engages from stem (9). Keep track of the
number of full revolutions to dis-engage
and record here. ________________
b. Maintain lift support from above the
actuator assembly (AA). Dis-engage
(slide) the swivel lower knuckle (44) out
of the upper knuckle (43) slot.

IOM-521 7
The valve body (1) is machined after the
shell halves (1.1) have been bolted (1.3, 1.4,
1.5) around the TFE core (1.2). Disassembly
of the body sub-assembly (1) will create
alignment problems during reassembly. The
TFE core (1.2) is not replaceable, except as
a body sub-assembly (1).
10. Make a visual inspection of the trim portions
still interconnected to the actuator assembly
(AA) for obvious problems.
11. Hand-grasp the bellows sub-assembly
(8) and rotate CCW (viewed from plug (3)
end) to removal. Do not use any wrench,
vise, etc., for grasping the bellows sub-
assembly (8)! The bellows (8) should only
be hand-tight.
12. Loosen packing gland nut (5) 2-3 revolutions
out of the bonnet (2) by rotating CCW (viewed
from stem (9) end).
13. Loosen jam nut (20) 1-2 revolutions.
14. Grasp the valve’s stem sub-assembly (9)
in the lower area (normally surrounded by
the bellows (8.1)) using soft jawed pliers
to prevent marring stem surface. Place
a wrench on the hex surface of the swivel
lower knuckle (44) and rotate knuckle CW
(viewed from plug (3) end) until lower knuckle
dis-engages from stem (9). Keep track of
the number of full revolutions to dis-engage
and record here. _______________
15. Retract the stem sub-assembly (9)
downwards through the bonnet (2) until
stopped by locknut (20). Rotate locknut (20),
CCW until it is removed.
16. Fully withdraw stem sub-assembly (9).
17. Visually inspect parts for wear, general
corrosion, localized corrosion, dirty service
fluid, uneven alignment, seat leakage wire
drawing, excess plug-to-seat loading,
flange facings, looseness of plug-to-bellows
connection, primary seal at TFE Core (1.2)
-to-bellows (8.1) joint, secondary seat at
bonnet gasket (11) (See Figure 9), blisters
on TFE surfaces, etc.
18. Attempt to determine the reason for a
failure. Evaluate if process conditions need
correction, if alternate materials are required
for the stem sub-assembly (9), or if effects
10. Raise the actuator assembly (AA) over stem
(9). Release any actuator air pressure. Lay
actuator assemby aside on work surface.
D. Body Disassembly:
1. Access to body assembly (BA) internals may
be accomplished with the actuator assembly
(AA) intact with the bonnet (2) (i.e. locknut
(15) is still fully tightened), or with the body
assembly (BA) separated as per above
paragraph V.C. Steps 1-10.
2. Maintenance procedures hereinafter are
based upon the actuator assembly (AA) fully
interconnected with the valve stem assembly
(9) during disassembly.
3. Secure the body in a vise with the actuator
assembly (AA) oriented vertically upwards.
Place matchmarks between the body (1)
bonnet flange and the bonnet (2) flange to
assist in final orientation when the body is
disassembled and/or the actuator removed.
4. Secure and rig the actuator assembly (AA)
for a vertical lift using an overhead hoist.
Remove slack from rigging.
5. Loosen all bonnet cap screws (14)
approximately 1/4" (6 mm) by rotating CCW
(viewed from above).
6. Raise actuator assembly (AA) with overhead
hoist approximately 1/8" (3 mm).
7. Continue to loosen and remove bonnet cap
screws (14 and lockwashers (13).
8. Using overhead hoist, lift the actuator
assembly (AA) with the interconnected
valve stem sub-assembly (9), bellows sub-
assembly (8), bonnet (2), bonnet spacer
(19), locknut (15), packing gland nut (5),
packing rings (6), Belleville spring washers
(7), bonnet gasket (11), plug (3) and plug
retainer (4). Lay this assembly down on a
horizontal work surface carefully, so as to
not damage the valve’s internals.
9. Make a visual inspection of the body sub-
assembly (1) exterior, which includes two
shell halves (1.1), TFE core (1.2), and four
body cap screws (1.3) with body nuts (1.4)
and lockwashers (1.5).
NOTE: DO NOT DISASSEMBLE THE PARTS
OF THE BODY SUB-ASSEMBLY (1)!

IOM-5218
F. Packing Ring Replacement:
1. Disassemble the body assembly (BA) per
V.C. previous, including separation of body
assembly (BA) from actuator assembly (AA).
2. Loosen packing gland nut (5) until fully
dis-engaged from bonnet (2) by rotating
CCW (viewed from stem (9) end). Remove
packing rings (6) from packing box (recess)
in bonnet (2).
3. Examine wall surface inside the bonnet (2)
for any sign of corrosion.
4. Hone the bonnet’s (2) packing box to a #16
RMS finish. Burnish the stem sub-assembly
(9) to a #4 RMS finish in the packing (6)
contact area.
G. Reassembly of Body Assembly:
1. Place body assembly (BA) (1) in a vise with
the bonnet (2) end directed upwards.
2. Join the stem sub-assembly (9) to the
bellows sub-assembly (8) (with new plug
head (3) already installed) by rotating the
stem's (9) lower end into embedded nut (8.2)
CW (viewed from bellows (8.1) open end).
Rotate the stem sub-assembly (9) as far as
possible while hand-grasping the bellows
(8.1) DO NOT USE A WRENCH IN THIS
OPERATION. A light coat of Fluorolube
(™ of Occidental Chemical Co.) lubricant
may be applied to the engaged (threaded)
end of the stem sub-assembly (9) if fluid
compatible.
3. Place spacer washer (10) over the threaded
upper end of stem sub-assembly (9).
4. Referring to Figure 7 for proper orientation
and quantity of Belleville spring washers (7),
place the spring washers (7) over the upper
end of stem sub-assembly (9).
5. Position a new bonnet gasket (11) into recess
of body sub-assembly (1).
6. Observe the underneath side of bonnet (2)
where square recess is located. Position
combined bellows sub-assembly (8) and
stem sub-assembly (9) so that the anti-
rotation "stop" (square part of stem)is aligned
to slip into the bonnet’s (2) square recess.
of possible permeation need considerations
similar to those outlined in Section III.C.1.
E. Plug, Bellows, or Both Replacement:
1. Disassemble the body assembly (BA) per
V.D.1.-11. previous.
2. Hand-grasp the bellows sub-assembly (8)
and hand-rotate the plug head (3) until the
plug retainer strip (4) ends come into view
through the slot located on the side of the
plug head (3).
3. Using a pointed end pick tool, get under one
end of the plug retainer strip (4) and extract
through the plug’s (3) slot. Manually rotate
the plug head (3) end to allow more of the
plug retainer strip (4) to be extracted. When
able to grasp with needle nose pliers, lightly
pull the plug retainer strip (4) and rotate the
plug head (3) as necessary until the strip
(4) is fully removed.
4. Slide plug head (3) off the stub-end of the
bellows sub-assembly (8).
5. Discard the plug head (3), if worn. Always
discard the plug retainer strip (4); only use
a new plug retainer strip (4) at reassembly.
6. Do not attempt to field remove embedded
nut (8.2) from inside the bellows (8.1); these
parts are only available as a sub-assembly
(8). If embedded nut (8.2) is badly corroded,
replace the entire bellows sub-assembly (8)
and give strong consideration to alternate
materials for stem sub-assembly (9) and
bellows nut (8.2). If embedded nut (8.2)
is “loose”, consider potential causes and
replace bellows sub-assembly (8).
7. If bellows sub-assembly (8) is to be reused,
thoroughly clean the valleys of the bellows
(8.1) convolutions (inside and outside) for
the smallest of debris. Clean the grooves
of the bellows (8.1) and the plug head (3)
where the plug retainer strip (4) locates.
8. Place the plug head (3) over the bellows
sub-assembly (8) end. Insert a new TFE
plug retainer strip (4) into the slot/groove.
Rotate the plug head (3) as necessary while
feeding the strip (4) until the strip (4) is fully
located into the groove. (No cutting of the
strip (4) should be required.)

IOM-521 9
and alignment of parts (10) (8) (11) (7),
remove temporary spacer while continuing
downward force on the stem (9) while
simultaneously holding the bonnet (2) from
dropping downwards.
13. Lower bonnet (2) carefully downwards into
the recess of the body sub-assembly (1)
while continually applying downward force
on the stem (9).
14. At this point, downward force on stem (9)
may be exchanged for downward force on
the bonnet (2). Hand-tighten all bonnet cap
screws (14); relax downward force on bonnet
once cap screws have taken up all slack.
15. Using a torque wrench, tighten bonnet cap
screws (14) in alternating cross-pattern in
1/4 revolution increments to 40 ft-# (55 N-M).
7. Center the loose parts (10) (7) surrounding
the stem (9) as close as possible.
8. Position the bonnet (2) over the exposed
upper stem sub-assembly (9), ensuring
that the anti-rotation "stop" (square or flat
surface of the stem) is properly engaged
into the bonnet (2) square recess.
9. Placeatemporaryspacerdevice(screwdriver
blade, nuts, plain washers, etc.) equally
spaced on the body (1) flange to hold the
bonnet (2) up, as bonnet is lowered into
the body, maximizing the gap between the
bonnet flanges (1) (2).
10. Place anti-seize thread lubricant on bonnet
cap screws (14). Engage all bonnet
cap screws (14) with lockwashers (13)
approximately 1-1/2 revolutions.
11. Visually observing the gap between the
bonnet (2) lower flange surface and the
body sub-assembly (1) bonnet flange, apply
downward force tending to seat the plug
end (3). This will pull the bellows (8.1) into
proper position for the primary bonnet seal.
12. When visually satisfied of concentricity
Figure 7: Belleville Spring Washer Orientation
1/2" (DN 15) & 1-1/2" (DN 40) Body Sizes
1" (DN 25) Body Size
2" (DN 50) Body Size
CAUTION
Improper bonnet bolting torques may lead to
premature failure of the primary and secondary
bonnet seals.
16. Engage threaded, vented pipe plug (12) into
the 1/8" NPT tap on the bonnet (2) if it was
removed. If a lubricating oil is compatible with
the fluid, a light coating will aid in preventing
galling of the plug (12). Ensure that the tip
of the notch on the threads is in the bonnet
(2) at least 1-1⁄2 revolutions. Do not over-
tighten to minimize chances of galling.
Do not use thread sealing compound that
might “fill in” the notch and negate the purpose
of the notch.
17. The packing ring set (6) design is identical for
all unit body sizes. It consists of seven V-rings
(6.1) and one each male (6.2) and female
(6.3) adapter. (See Figure 8.) The purpose of
the packing rings (6) is to minimize moisture
ingress, and to serve as a secondary stem
seal in the event of bellows sub-assembly
(8) failure.
Carefully install rings (6) as indicated in
Figure 8, one at a time, using a hollow tool
to press the rings (6) to their final position.
Take care in slipping the rings (6) over the
threaded end of the stem (9) so as to not
mar the ring’s (6) internal surfaces. Do not
reverse orientation for vacuum service. Do
not “split” rings (6) for ease in replacement.
Do not reuse removed packing rings (6).

IOM-52110
4. This procedure assumes that bonnet (2) has
been bolted to the body sub-assembly (1).
5. Engage stem jam nut (20) to body assembly’s
stem (9) by rotating CW (viewed from valve
stem (9) end). Rotate jam nut (20) all the
way to root of the stem (9) threads.
6. Lower actuator assembly (AA) until the
opening of the actuator yoke (1) is at the
level of jam nut (20).
7. Place yoke nut (15) over valve stem (9) and
lower the nut to rest upon the yoke (3).
8. Push valve stem (9) downward towards
seating position. NOTE: The valve bellows
(8) may give “spring action” to keep the plug
(3) partially away from the seat.
9. For Direct Action ATO-FC Only: Connect
a temporary air supply hose that has an
adjustable airset with gauge connected at
the lower actuator inlet. Pressurize actuator
to a sufficient level to the upper pressure
level of the bench setting; i.e. for 5–15 psig
(.34–1.03 Barg) range, set pressure at 15
psig (1.03 Barg).
10. Apply Loctite Nickel Anti-Seize to grove and
top surface of swivel lower knuckle. Engage
(slide) the lower knuckle (44) into the upper
knuckle (43) saddle.
11. Continue lowering the actuator assembly
(AA) until the swivel lower knuckle (44)
connector and the valve's stem (9) just
touch. NOTE: For ATO-FC may need to
slowly reduce air pressure in the actuator
to connect the stem and knuckle.
12. Thread yoke nut (15) onto bonnet (2) threads
by hand as far as possible to help stabilize
topworks. Wrench-tighten one-half (1/2)
extra revolution.
13. Engage valve stem (9) threads to swivel
lower knuckle (44). Rotate swivel knuckle
(44) CW (viewed from actuator end) to
engage with valve stem (9), refer to V.C.
Steps 9A or 9B for the number of revolutions
recorded to dis-engage the lower knuckle.
14. Remove overhead rigging to allow actuator
assembly (AA) to fully rest on the bonnet (2).
Refer back to V.C. Step 2 for alignment of
match marks. Hand-tighten yoke nut (15).
18. Place anti-seize thread lubricant on threads
of packing gland nut (5). Place gland nut
(5) over the stem (9) end and engage with
the bonnet (2) by rotating CW (viewed from
exposed stem (9) end); continue finger-
tightening to the point of resistance. Wrench
tighten gland nut (5) 1/8 revolution past the
manual tightening resistance point.
19. Place bonnet spacer (19) down over
threaded portion of the bonnet (2).
20. Valve body assembly (BA) is completed, and
may be pressure tested up to 275 psig x 1.5
= 413 psig (19.0 Barg x 1.5 = 28.5 Barg) at
ambient temperature. Before pressurizing
for hydro, ensure that plug (3) is away from
body (1) seat. NOTE: Use soft gaskets on
body assembly (BA) end flanges to prevent
distortion of TFE flange facings.
H. Mounting Actuator Assembly to Body
Assembly:
1. Reference Actuator IOM-C27-C53 for item
number call outs and drawings for actuator.
This procedure assumes that accessory
plate ((AP)) or indicating washer (51) was
not removed or has been secured to the
actuator stem(6) by the swivel upper knuckle
(43) - tighten with 20-30 ft.lbs. (27-40 N M).
DO NOT allow actuator stem (6) to rotate.
Secure flats on bottom of stem (6) when
rotating knuckle (43).
2. Secure the body assembly (BA) in a vise
with the valve stem (9) oriented vertically.
3. Rig actuator assembly (AA) to be supported
from above.
Figure 8:Packing Ring Set

IOM-521 11
15. For Direct Action ATC-FO Only: Release
all air pressure from actuator assembly (AA),
see step 9 previous and remove temporary
air supply.
16. Re-tighten packing gland nut (5).
VI. CALIBRATION
A. General:
1. This section only covers calibration of this
control valve with Actuator Models C27-C53.
2. Positioner, if installed, requires reference to
the specific positioner model IOM for proper
calibration procedure.
3. All indicated Item Numbers that are
with respect to IOM-C27-C53 will be in
parenthesis and underscored; i.e. (20). All
Item Numbers that are with respect to this
IOM-521 are not underscored; i.e. (32).
B. Procedure – Reverse Action, ATO-FC:
1. Reference the nameplate (40) attached to
the actuator yoke (3). Determine the bench
setting of the installed range springs (10)
from the nameplate (40).
2. Connect a temporary air supply with an in-
line adjustable airset regulator and gauge
to the lower actuator connection. DO NOT
LOAD with any air pressure at this point.
3. To determine when stem/plug (9) begins to
lift out of the seat, touch the stem below the
jam nut with one finger. (Stem will begin to
move when actuator pressure exceeds the
spring load.)
4. Slowly pressurize the actuator to a pressure
equal to the lower pressure level of the bench
setting; i.e. for 5-15 psig (.34–1.03 Barg)
range, set pressure at 5 psig (.34 Barg).
Take note of pressure reading when the
stem first begins to move.
5. If the loading pressure for the start of stem
movement is below the lower end of the
desired bench setting, then the combined
stem (9, 6) length is too short.
a. Rotate jam nut (20) down to base of
threads on stem (9).
SECTION VI
b. Increase pressure in the actuator to
approximately mid range of the bench
setting.
c. Rotate lower knuckle (44) CCW to
increase the combined stem length. DO
NOT allow actuator stem (6) to rotate
in the actuator.
d. Release all pressure from the actuator
and repeat Step 4 previous.
6. If the loading pressure for the start of stem
movement is above the lower end of the
desired bench setting, then the combined
stem (9, 6) length is too long.
a. Rotate jam nut (20) down to base of
threads on stem (9).
b. Increase pressure in the actuator to
approximately mid range of the bench
setting.
c. Rotate lower knuckle (44) CW to shorten
the combined stem length. DO NOT
allow actuator stem (6) to rotate in the
actuator.
d. Release all pressure from the actuator
and repeat Step 4 previous.
7. Observe the location of the indicating washer
(51) to the "C" mark on the indicator plate
(23), making sure to use the “top edge” of
the indicating washer (51) as the reference
point. Adjust indicator plate as needed.
8. Remove vented pipe plug (12) from the neck
of the bonnet (2).
9. Slowly increase the pressure in the actuator
until the indicating washer (51) is in alignment
with the "O" mark on the indicator plate. As
pressure increases, through the hole where
the vented pipe plug (12) was removed,
watch for the anti-rotational "stop" (square
or flat surface of the stem) to appear.
17. Tighten yoke nut (15) to 85 ft--# (115 N-M)
18. Calibrate actuator to valve per Section VI.

IOM-52112
(Stem movement will stop when the plug
engages the seat.)
4. Slowly pressurize the actuator to a pressure
equal to the upper pressure level of the
bench setting; i.e. for a 5-15 psig (.34 -1.0
Barg) range, set pressure at 15 psig (1.0
Barg). Take note of the pressure reading
when stem travel actually stops.
5. If theloading pressure,when stem movement
stops, is below the upper end of the desired
bench setting, then the combined stem (9,
6) length is too long.
a. Rotate jam nut (20) down to base of
threads on stem (9).
b. Decrease pressure in the actuator to
approximately mid range of the bench
setting.
c. Rotate lower knuckle (44) CCW to
shorten the combined stem length. DO
NOT allow actuator stem (6) to rotate
in the actuator.
d. Release all pressure from the actuator
and repeat Step 4 previous.
6. If the loading pressure, whenstem movement
stops, is above the upper end of the desired
bench setting, then the combined stem (9,
6) length is too short.
a. Rotate jam nut (20) down to base of
threads on stem (9).
b. Decrease pressure in the actuator to
approximately mid range of the bench
setting.
c. Rotate lower knuckle (44) CW to
increase the combined stem length. DO
NOT allow actuator stem (6) to rotate in
the actuator.
d. Release all pressure from the actuator
and repeat Step 4 previous.
7. Increase pressure in the actuator to the
upper pressure level of the bench setting.
8. Observe the location of the indicating washer
(51) to the "C" mark on the indicator plate
(23), making sure to use the “top edge” of
the indicating washer (51) as the reference
point. Adjust indicator plate as needed.
8. Remove vented pipe plug (12) from the neck
of the bonnet (2).
9. Slowly release air pressure in actuator until
indicating washer (51) is in alignment with
the “O” mark on the indicator plate (23).
NOTE: This "stop" should not function as an
up travel stop and push up against the bonnet
(2) (metal to metal). A gap of approximately
1/16" (1-1/2 mm) should exist between these
two surfaces.
NOTE: The purpose of a correct calibration
of the stem stroke is to cause the up travel
to be limited by the actuator travel stop nut.
10. To limit the up travel, rotate the travel stop nut
(52) CW and secure to bottom of attachment
hub (4).
NOTE: Secure the actuator stem (6) by the
flats when rotating the travel stop nut.
NOTE: "Stroke" length is indicated on the
nameplate (40), and is the distance between
the "C" and "O" marks of the indicator plate
(23).
NOTE: The proper calibration of the actuator
/ valve unit will occur when at the lower
pressure level of bench setting the valve
plug (3) will just begin to travel from the "C"
position. At the upper level of the bench
setting, the actuator pressure should be
within ±8% of the upper bench range for
the desired stroke length.
11. Engage threaded, vented pipe plug (12)
into the 1/8" NPT tap on the bonnet (2). If
a lubricating oil is compatible with the fluid,
a light coating will aid in preventing galling
of the plug (12). Ensure that the tip of the
notch on the threads is in the bonnet (2) at
least 1-1⁄2 revolutions.
Do not over-tighten to minimize chances of
galling.
Do not use thread sealing compound that
might “fill in” the notch and negate the
purpose of the notch.
12. Release all pressure from actuator.
C. Procedure – Direct Action, ATC-FO:
1. Reference the nameplate (40) attached to
the actuator yoke (3). Determine the bench
setting of the installed range springs (10)
from the nameplate (40).
2. Connect a temporary air supply with an in-
line adjustable airset regulator and gauge
to the upper actuator connection. DO NOT
LOAD with any air pressure at this point.
3. To determine when stem/plug (3) makes
contact with the seat and travel stops, touch
the stem below the jam nut with one finger.

IOM-521 13
As pressure decreases, through the hole
in the bonnet where the vented plug (12)
was removed, watch for the anti-rotational
"stop" (square or flat surface of the stem)
to appear.
NOTE: This "stop" should not function as an
up travel stop and push up against the bonnet
(2) (metal to metal). A gap of approximately
1/16" (1-1/2 mm) should exist between these
two surfaces.
NOTE: The purpose of a correct calibration
of the stem stroke is to cause the up travel
to be limited by the actuator travel stop nut.
10. To limit the up travel, rotate the travel stop nut
(52) CW and secure to bottom of attachment
hub (4).
NOTE: Secure the actuator stem (6) by the
flats when rotating the travel stop nut.
NOTE: "Stroke" length is indicated on the
nameplate (40), and is the distance between
the "C" and "O" marks of the indicator plate
(23).
NOTE: The proper calibration of the actuator
/ valve unit will occur when at the upper
pressure level of bench setting, the valve
plug (3) will be in the "C" position. At the
lower level of the bench setting, the actuator
pressure should be within ±8% of the lower
bench range for the designed stroke length.
11. Reinstall vented pipe plug (12) using
“Fluorolube” grease on threads.
12. Release all pressure from actuator.
Figure 9: Primary & Secondary Body/Bonnet

IOM-52114
SECTION VII
VII. TROUBLE-SHOOTING GUIDE:
1. Valve is "jumpy" in stroking.
Possible Causes Remedies
A. Excess packing friction. A1. Re-align body--stem--actuator.
A2. Packing follower too tight; back packing gland nut out.
A3. Install positioner.
A4. Increase bench set by changing to stiffer actuator range spring. May require
positioner if not installed. May require different airset.
B. Installed backwards. B. Install per flow arrow. Direction is only FTO.
2. Valve/actuator makes "screeching" noise.
Possible Causes Remedies
A. Excess pressure drop. A. Bring pressure drop within design limits.
3. Valve exhibits "excess" vibration.
Possible Causes Remedies
A. Excess pressure drop. A. Bring pressure drop within design limits.
B. Excessive cavitation in liquid service. B. Change operation parameters to relieve causes of cavitation.
C. High outlet velocity. C1. Reduce flow rate and/or pressure drop.
C2. Use multiple valves in series or parallel.
C3. Increase outlet pipe size.
C4. Use larger valve body with reduced trim.
4. Valve exhibits "excess" seat leakage.
Possible Causes Remedies
A. Excess pressure drop. A1. Reduce pressure drop conditions.
A2. Convert to reduced trim.
A3. Increase actuator thrust by changing actuator range spring.
B. Excess body and/or plug wear. B1. Oversized valve operating too close to seat; go to reduced trim.
B2. Remove abrasive particulate.
B3. Possible excess cavitation in liquid service. Change operation parameters.
B4. Replace body assembly if seat is badly worn. Replace plug if badly worn.
5. Bonnet gasket leakage.
Possible Causes Remedies
A. Improper bonnet bolting drawdown. A1. Remove bonnet taking necessary safety precautions. Inspect bellows to
determine if primary seal at body/bellows is damaged. If bellows is damaged,
replace bellows.
A2. Inspect secondary seal bonnet gasket for uneven thickness.
Replace bonnet gasket.
A3. Draw down bonnet bolting evenly and in a cross pattern; use bonnet bolting
torque levels indicated herein.
B. Cantilevered actuator. B1. Do not allow use of the actuator as a "step" upon which personnel may climb.
B2. Do not "set" any added weight on the actuator.
B3. Install vertically.
6. Body flange leakage.
Possible Causes Remedies
A. Over-tightening flange bolting. A. Loosen bolting, replace/install new gasket, retighten flange bolting in s
cross-pattern evenly.
B. Improper pipe supports and anchors. B. Provide piping anchors and guides at control valve station.
Restrain bending movements.
C. Corroded flange bolting. C. Replace with corrosion resistant flange bolting.
D. Used outside pressure/temperature limits. D. Bring process variables within range of application; see Graph 1 in 521-TB.

IOM-521 15
7. Bellows failure.
Possible Causes Remedies
A. Overstroke of actuator. A. Recalibrate valve/actuator unit.
B. Abrasive particulate in fluid. B. Remove all fluid particulate.
C. Pressure, temperature, or pressure drop
outside limits.
C. Bring process variables within range of application; see Graph 1 in 521-TB..
D. Fluid absorption. D1. Reduce pressure/temperature if possible.
D2. Reduce number of startups/shutdowns, or rapid depressurizations.
E. Frequent stroking causing fatigue failure of
TFE material.
E1. Stabilize input SIG.
E2. Stabilize positioner output LOAD.
E3. Stabilize process variations to steady state, steady flow.
E4. Excess "play" in actuator swivel adapter; replace adapter.
E5. Cycle life reached; replace bellows.
F. Corrosion of embedded nut. F1. Consult factory.
F2. Use alternate stem material.
8. Corrosion of stem sub-assembly at packing area.
Possible Causes Remedies
A. Loose packing. A. Disassemble valve and replace stem. Reassemble and tighten packing.
B. Fluid permeation of bellows. B1. Bring process variables within range of application; see Graph 1 in 521-TB.
B2. Use alternate stem materials construction.
B3. Locate, or position valve to be out of ambient moisture.
B4. Modify insulation if "trapping" moisture around packing gland nut.
B5. Purge "void zone".
C. Bellows failure. C. See No. 7 of this section.
9. Corrosion of silver soldered joint in sub-assembly (1-1/2" or 2" sizes only).
Possible Causes Remedies
A. Fluid permeation with chemical attack of
silver solder.
A1. Use alternate stem materials construction.
A2. Purge "void zone".
10. Corrosion surrounding vented pipe plug on bonnet.
Possible Causes Remedies
A. Fluid permeation and loose vented pipe plug. A1. Tighten plug.
A2. Replace corroded plug.
A3. Purge "void zone".
B. Bellows Failure. B. Replace bellows.
11. External corrosion of jacket halves, bonnet, and body and bonnet bolting.
Possible Causes Remedies
A. Corrosive ambient environment. A1. Determine location of corrosive fluid and maintain cause of leakage.
A2. Coat exposed portions with suitable corrosive resistant epoxy to degree able,
12. Blisters on TFE internals.
Possible Causes Remedies
A. Effects of absorption. A1. Reduce pressure/temperature levels.
A2. Reduce startups/shutdowns and rapid depressurizations.
A3. Replace body assembly.
13. General corrosion of internals in "void zone", including Belleville washers ,embedded nut, bonnet, anti-rotation stop, and stem.
Possible Causes Remedies
A. Permeation together with ingress of
moisture in "void zone".
A1. Remove moisture source to greatest degree possible.
A2. Purge "void zone".

IOM-52116
Figure 10: Control Valve Internals
ITEM NO. DESCRIPTION
1 Body Sub-Assembly
1.1 * Half Shell
1.2 * TFE Core
1.3 * Cap Screw
1.4 * Nut
1.5 * Lockwasher
2 Bonnet
3 Plug Head
4 Plug Retainer Strip
5 Packing Gland Nut
6 Packing Set
ITEM NO. DESCRIPTION
7 Belleville Spring Washer
8 Bellows Sub-Assembly
9 Stem Sub-Assembly
10 Spacer
11 Bonnet Gasket
12 Vented Pipe Plug
13 Lockwasher
14 Bonnet Cap Screw
15 Yoke nut
Not Shown
18 Rating Tag
19 Bonnet Spacer
20 Jam Nut
* Sub-level parts that make up the body sub-assembly; NOTE: DO NOT DISASSEMBLE THE PARTS OF THE
BODY SUB-ASSEMBLY (1)! The valve body (1) is machined after the shell halves (1.1) have been bolted (1.3,
1.4, 1.5) around the TFE core (1.2). Disassembly of the body sub-assembly (1) will create alignment problems
upon completed reassembly. The TFE core (1.2) is not replaceable, except as a body sub-assembly (1).
NOTE: No. varies
by body size

IOM-521 17
SECTION VIII
NEW REPLACEMENT UNIT:
Contact your local Cashco, Inc., Sales
Representative with the Serial Number and Product
code. With this information they can provide a
quotation for a new unit including a complete
description, price and availability.
–7–
VIII. ORDERING INFORMATION:
NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR
To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stamped
on the metal name plate and attached to the unit. This information can also be found on the Bill of Material
("BOM"), a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
Product Code typical format as follows: (last digit is alpha character that reflects revision level for the product).
PARTS "KIT" for FIELD REPAIR:
Contact your local Cashco, Inc., Sales
Representative with the Serial Number and Product
code. Identify the parts and the quantity required
to repair the unit from the "BOM" sheet that was
provided when unit was originally shipped.
NOTE: Those part numbers that have a quantity indicated
under "Spare Parts" in column "A” reflect minimum
parts required for inspection and rebuild, - "Soft
Goods Kit". Those in column “B” include minimum
trim replacement parts needed plus those "Soft
Goods" parts from column "A".
If the "BOM" is not available, refer to the cross-
sectional drawings included in this manual for part
identification and selection.
A Local Sales Representative will provide quotation
for appropriate Kit Number, Price and Availability.
CAUTION
Do not attempt to alter the original construction of any
unit without assistance and approval from the factory.
All purposed changes will require a new name plate
with appropriate ratings and new product code to
accommodate the recommended part(s) changes.
TO RETURN A VALVE FOR REPAIR: (RGA)
Before returning this Model - Contact Cashco Inc.
for permission to return the unit (as a whole or
any part of) and to obtain an "RGA" identification
number. This number must be marked clearly on the
outside of the returned container. In addition, affix
to the outside of the container a signed statement
attesting to the fact that the valve and/or parts has
been flushed out for a specific period of time using
an "OSHA"acceptable neutralizing agent. The name
of the agent, the manufacturer's company name
and the total concentration level must be included
for both the valve service medium, as well as the
neutralizing agent.
NO returns will be accepted at Cashco Inc. without
an M.S.D.S. (Material Safety Data Sheet) affixed to
the outside of the returned container.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to
modify or improve the designs or specifications of such product at any time without notice.
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any
Cashco, Inc. product remains solely with the purchaser.

IOM-52118
ITEM NO. DESCRIPTION
1 Body Sub-Assembly
2 Bonnet
3 Plug Head
4 Plug Retainer Strip
5 Packing Gland Nut
6 Packing
7 Belleville Spring Washer
8 Bellows Sub-Assembly
ITEM NO. DESCRIPTION
9 Stem Sub-Assembly
10 Spacer
11 Bonnet Gasket
12 Vented Pipe Plug
13 Lockwasher
14 Bonnet Cap Screw
15 Yoke nut
18 Rating Tag
19 Bonnet Spacer
20 Jam Nut
Not Shown
17 ANSI/DIN Adapter Gasket
43 Upper knuckle See Fig. 6
44 Lower knuckle See Fig. 6
51 Indicating Washer See Fig. 6
Note: End flange
tapped bolt holes
straddle horizontal and
vertical centerlines.
Figure 11: Body Assembly (BA)

IOM-521 19
Cashco, Inc. declares that the products listed in the table below has been found to comply with the Essential
Health and Safety Requirements relating to the design and construction of products intended for use in potentially
explosive atmospheres given in Annex II of the ATEX Directive 2014/34/EU. Compliance with the Essential
Health and Safety Requirements has been assured by compliance with EN ISO 80079-36:2016 and EN ISO
80079-37:2016. The product will be marked as follows:
II 2 G
Ex h IIB T6... T1 Gb
1000ATEXR1 X
The ‘X’ placed after the technical file number indicates that the product is subject to specific conditions of use as
follows:
1. The maximum surface temperature depends entirely on the operating conditions and not the equipment
itself. The combination of the maximum ambient and the maximum process medium temperature shall
be used to determine the maximum surface temperature and corresponding temperature classification,
considering the safety margins described prescribed in EN ISO 80079-36:2016, Clause 8.2. Additionally, the
system designer and users must take precautions to prevent rapid system pressurization which may raise
the surface temperature of system components and tubing due to adiabatic compression of the system gas.
Furthermore, the Joule-Thomson effect may cause process gases to rise in temperature as they expand
going through a regulator. This could raise the external surface temperature of the regulator body and
the downstream piping creating a potential source of ignition. Whether the Joule-Thomson effect leads to
heating or cooling of the process gas depends on the process gas and the inlet and outlet pressures. The
system designer is responsible for determining whether the process gas temperature may raise under any
operating conditions.
2. Where the process medium is a liquid or semi-solid material with a surface resistance in excess of 1GΩ,
special precautions shall be taken to ensure the process does not generate electrostatic discharge.
3. Special consideration shall be made regarding the filtration of the process medium if there is a potential for
the process medium to contain solid particles. Where particles are present, the process flow shall be <1m/s
(<3.3 ft/s) in order to prevent friction between the process medium and internal surfaces.
4. Effective earthing (grounding) of the product shall be ensured during installation.
5. The valve body/housing shall be regularly cleaned to prevent build up of dust deposits.
6. Regulators must be ordered with the non-relieving option (instead of the self-relieving option) if the process
gas they are to be used with is hazardous (flammable, toxic, etc.). The self-relieving option vents process
gas through the regulator cap directly into the atmosphere while the non-relieving option does not. Using
regulators with the self-relieving option in a flammable gas system could create an explosive atmosphere in
the vicinity of the regulator.
7. Tied diaphragm regulators with outlet ranges greater than 7 barg (100 psig) should be preset to minimize the
risk that improper operation might lead to an outboard leak and a potentially explosive atmosphere.
8. All equipment must only be fitted with manufacturer’s original spare parts.
9. Ensure that only non-sparking tools are used, as per EN 1127-1, Annex A.
ATEX 2014/34/EU: Explosive Atmospheres and Cashco Inc. Products

IOM-52120
Cashco, Inc.
P.O. Box 6
Ellsworth, KS 67439-0006
PH [phone]
Fax. # [phone]
www.cashco.com
email: [email protected]
Printed in U.S.A. 521-IOM
Cashco do Brasil, Ltda.
Al.Venus, 340
Indaiatuba - Sao Paulo, Brazil
PH [phone]
Fax. No.
www.cashco.com
email: [email protected]
Cashco GmbH
Handwerkerstrasse 15
15366 Hoppegarten, Germany
PH [phone]
Fax. No. [phone]
www.cashco.com
email: [email protected]
REGULATORS
PRODUCT
31-B, 31-N
1164, 1164(OPT-45)
1171, 1171(OPT-45), 1171(CRYO)
2171, 2171(OPT-45), 2171(CRYO), 3171
1465, 3381, 3381(OPT-45), 3381(OPT-40)
4381, 4381(OPT-37), 4381(CRYO), 4381(OPT-45), 5381
MPRV-H, MPRV-L
PBE, PBE-L, PBE-H
CA-1, CA-2
CA1, SA1, CA4, SA4, CA5, SA5
DA2, DA4, DA5, DA6, DA8
DA0, DA1, DAP, SAP
SLR-1, SLR-2, PTR-1
ALR-1, ULR-1, PGR-1
BQ, BQ(OPT-45), BQ(CRYO)
123, 123(CRYO), 123(OPT-45), 123(OPT-46G)
123-1+6, 123-1+6(OPT-45), 123-1+6(OPT-46G), 123-1+6+S, 123-1+6+S(OPT-40)
1000HP, 1000HP(OPT-37), 1000HP(OPT-45), 1000HP(OPT-45G), 1000HP(CRYO)
1000HP-1+6, 1000HP-1+8, 1000LP, 1000LP(OPT-45), 1000LP(OPT-46G)
6987
8310HP, 8310HP-1+6, 8310HP-1+8, 8310LP, 8311HP, 8311LP
345, 345(OPT-45)
BA1/BL1, PA1/PL1
C-BPV, C-PRV, C-CS
D, D(CRYO), D(OPT-37), D(OPT-20), D(OPT-45)
DL, DL(LCC), DL(OPT-45)
BR, BR(CRYO)
HP, HP(LCC), HP(OPT-45), HP(OPT46G), HP-1+6+S(OPT-40), HP-1+6+S
P1, P2, P3, P4, P5, P7
B2, B7
POSR-1, POSR-2
5200P, 5300P
135
NW-PL, NW-SO
CG-PILOT
FG1
CONTROL
VALVES
RANGER, 987, PREMIER
964, 521, 988, 988-MB, 989
2296/2296HF
SCV-30, SCV-S
FL800/FL200
TANK
BLANKETING
8700, 8910, 8920, 8930, 8940
2100, 2199
3100, 3200, 3300, 3400, 3500, 3600, 3700
1078, 1088, 1100, 1049
5100, 5200, 5400 ,5500
4100, 4200, 4300, 4400, 4500, 4600
MISC 764P/PD, 764-37, 764T