cashco B2 Instruction manual

IOM-B2
02-20
MODEL B2
BACK PRESSURE REGULATOR
The Model B2 is a back pressure regulator used to control upstream (inlet or P1) pressure. Sizes are 1/4" and
3/8" NPT (DN8 and DN10) FNPT or 1/2" (DN15) with Tri-Clamp connections. The unit is suitable for gaseous
or liquid service. Refer to Technical Bulletin B2-TB for design conditions and selection recommendations.
SECTION II
II. INSTALLATION
1. An inlet block valve should always be installed.
2. If service application is continuous such that
shutdown is not readily accomplished, it is rec-
ommended that an inlet block valve, outlet block
valve, and a manual bypass valve be installed.
3. Pipe unions should be installed to allow removal
from piping.
4. An inlet pressure gauge should be located ap-
proximately ten pipe diameters upstream, and
within sight.
5. All installations should include a downstream
relief device if the inlet pressure could exceed the
pressure rating of any downstream equipment or
the maximum outlet pressure rating of the unit.
6. Clean the piping of all foreign material including
chips, welding scale, oil, grease and dirt before
installing the regulator. Strainers are recom-
mended.
7. In placing thread sealant on pipe ends prior to
engagement, ensure that excess material is
removed and not allowed to enter the regulator
upon startup.
8. Flow Direction: Install so the flow direction
matches the inlet stamp on the main regulator
body (1).
9. For best performance, install in well drained
horizontal pipe.
10. Basic Regulator - (Refer to Figure 2, Model B2):
Regulator may be rotated around the pipe axis
360°. Recommended position is with knob (4)
vertical upwards.
11. Regulators are not to be buried underground.
12. For insulated piping systems, recommendation
is to not insulate regulator.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
SECTION l
I. DESCRIPTION AND SCOPE
CAUTION
This is not a safety device and must not be substituted for a code approved pressure safety relief valve
or a rupture disc.
CAUTION
Installation of adequate overpressure protection
is recommended to protect the regulator from
overpressure and all downstream equipment from
damage in the event of regulator failure.
Recommended Piping Schematic for Back Pressure Regulator
ISO Registered Company

IOM-B22
SECTION IV
IV. STARTUP
SECTION V
V. SHUTDOWN
SECTION III
III. PRINCIPLE OF OPERATION
1. Movement occurs as pressure variations register on
the diaphragm. The registering pressure is the inlet,
P1, or upstream pressure. The range spring opposes
diaphragm movement. As inlet pressure drops, the
range spring pushes the diaphragm down, closing
the port; as inlet pressure increases, the diaphragm
pushes up and the port opens.
2. A complete diaphragm failure will cause the regulator
to fail closed.
1. Start with the block valves closed. A bypass valve
may be used to maintain inlet pressure in the up-
stream system without changing the following steps.
2. Relax the range spring (15) by turning knob (4)
counter clockwise (CCW) a minimum of three (3) full
revolutions. This reduces the inlet pressure setpoint.
3. If it is a “hot” piping system, and equipped with a
bypass valve, slowly open the bypass valve to pre-
heat the system piping and to allow slow expansion
of the piping. Assure proper steam trap operation if
installed. Closely monitor inlet (upstream) pressure
via gauge to assure not over-pressurizing. NOTE: If
no bypass valve is installed, extra caution should be
used in starting up a cold system; i.e. do everything
slowly.
4. Crack open the inlet (upstream) block valve.
5. Slowly open the outlet (downstream) block valve
observing the inlet (upstream) pressure gauge.
Determine if the regulator is flowing. If not, slowly
rotate the regulator adjusting screw CCW until flow
begins.
6. Continue to slowly open the outlet (downstream)
block valve until fully open.
7. Observing the inlet (upstream) pressure gauge,
rotate knob (4) clockwise (CW )slowly until the inlet
pressure begins to rise. Rotate CW until the desired
setpoint is reached.
8. Continue to slowly open the inlet (upstream block
valve. If the inlet (upstream) pressure exceeds the
desired setpoint pressure, rotate knob (4) CCW until
the pressure decreases.
9. When flow is established steady enough that both
the outlet and inlet block valves are fully open, begin
to slowly close the bypass valve, if installed.
10. Develop system flow to a level near its expected
normal rate, and reset the regulator setpoint by turn-
ing knob (4) CW to increase inlet pressure, or CCW
to reduce inlet pressure.
11. Using a downstream valve, reduce system flow to a
minimum level and observe setpoint. Inlet pressure
will rise from the setpoint of Step 9. (Ensure this rise
does not exceed the stated upper limit of the range
spring by greater than 50%, i.e. 2-50 psig (.14 - 3.4
Barg) range spring, at maximum flow the inlet pres-
sure should not exceed 1.5 x 50 psig (3.4 Barg), or
75 psig (5.2 Barg). If it does, consult factory).
12. Increase flow to maximum level, if possible. Inlet
(upstream or P1) pressure should fall off. Readjust
setpoint as necessary at the normal flow rate.
1. On systems with a bypass valve, and where system
pressure is to be maintained as the regulator is shut
down, slowly open the bypass valve while closing the
inlet (upstream) block valve. Fully close the inlet (up-
stream) block valve. (When on bypass, the system
pressure must be constantly observed and manually
regulated. Close the outlet (downstream) block
valve.
CAUTION
The maximum inlet pressure is stamped on the
body as the upper range spring pressure level, and
is the recommended “upper operative limit” for
the sensing diaphragm (see Section IV. Startup,
Step 7). Higher pressures could damage the
diaphragm. (Field hydrostatic tests frequently
destroy diaphragms. DO NOT HYDROSTATIC TEST
THROUGH AN INSTALLED UNIT; ISOLATE FROM
TEST.)
CAUTION
Do not walk away and leave a bypassed regulator
unattended.

IOM-B2 3
CAUTION
To prevent damage to body, use soft jaws when
placing body in a vise. Position so that vise closes
over the flats on lower end of body.
SECTION VI
VI. MAINTENANCE
A. General:
1. Maintenance procedures hereinafter are
based upon removal of the regulator unit
from the pipeline where installed.
2. Owner should refer to owner's procedures
for removal, handling, cleaning and disposal
of nonreusable parts, i.e. gaskets, etc.
3. Refer to Figure 2 for Model B2 basic regula-
tor and Figure 1 for the diaphragm subas-
sembly.
B. Diaphragm Replacement - Model B2:
1. Securely install the body (1) in a vise with
knob (4) directed upwards.
2. Relax range spring (15) by turning knob (4)
CCW until rotation comes to a complete
stop. NOTE: It is not necessary to remove
the knob (4) before removing the spring
chamber (6) from the body (1).
3. Remove spring chamber (6) by grasping the
flats and turning CCW. Upon removal, the
range spring (15), range spring clip (16),
and spring button (5) should remain inside
the spring chamber.
4. Remove diaphragm subassembly (7) consist-
ing of the actuator nut (7.3), diaphragm (7.1),
actuator post (7.2), actuator gasket (7.4), ac-
tuator o-ring (7.5). Remove diaphragm gasket
(10).
5. Remove actuator nut (7.3) and separate all
parts of the diaphragm subassembly (7).
6. Clean body (1) diaphragm flange surface
and all reusable parts according to owner's
procedures. Do not scratch diaphragm
gasket seating surface. NOTE: On regu-
lators originally supplied as “oxygen clean”,
Option-M, maintenance must include a level
of cleanliness equal to Cashco's cleaning
standard #S-1134. On regulators originally
suppled for Sanitary Service, maintenance
must include a level of cleanliness equal to
Cashco cleaning standard #S-1576. Contact
factory for details.
7. Inspect and replace any necessary parts.
NOTE: Use only parts manufactured and
supplied by Cashco, Inc. for these products.
See Section VIII.
8. Reassemble diaphragm subassembly (7) by
placing the actuator gasket (7.4), diaphragm
(7.1), and actuator o-ring (7.5) over the
threads of the actuator post (7.2). Place a
thread sealant compound on the threads of
the actuator post (7.2) prior to installing the
actuator nut (7.3). Install actuator nut (7.3)
and tighten to the following torque value: ALL
SIZES: 15 Ft-lbs (20 Nm).
9. Place the diaphragm gasket (10) onto the
body (1) diaphragm flange. Place di
aphragm
subassembly on top of the gasket (10).
Figure 1: Diaphragm Subassembly
WARNING
SYSTEM UNDER PRESSURE. Prior to performing
any maintenance, isolate the regulator from the
system and relieve all pressure. Failure to do so
could result in personal injury.
WARNING
SPRING UNDER COMPRESSION. Prior to removing
spring chamber, relieve range spring compression
by turning the knob CCW until rotation comes to a
complete stop. Failure to do so may result in flying
parts that could cause personal injury.
2. If the regulator and system are to both be shut
down, slowly close the inlet (upstream) block
valve. Close the outlet (downstream) valve only
if regulator removal is required.

IOM-B24
10. Lubricate the threads of the body (1) with a
lightweight grease that is compatible with ser-
vice use. Rotate the spring chamber (6) CW
by hand onto the threaded portion of the body
(1) until firmly seated against the diaphragm
gasket (10). Tighten to the following torque
value: ALL SIZES: 65–70 Ft lbs (88–95 Nm).
11. Pressurize with air and spray liquid leak de-
tector around body (1) and spring chamber
(6) to test for leakage. Ensure that an outlet
pressure is maintained during this leak test
of at least mid-range spring level; i.e. 2-100
psig (.14-6.9 Barg) range spring, 51 psig (3.5
Barg) test pressure minimum.
C. Trim Replacement:
1. Remove spring chamber subassembly and
diaphragm subassembly per Section VI,
Steps B.1.–B.4.
2. Remove seat retainer (13) and seat (12) by
turning CCW.
3. Clean debris from within the body (1) cav-
ity. Clean all parts to be reused according
to owner's procedures. NOTE: On regula-
tors originally supplied as “oxygen clean”,
Option-M, maintenance must include a level
of cleanliness equal to Cashco's cleaning
standard #S-1134. On regulators originally
suppled for Sanitary Service, maintenance
must include a level of cleanliness equal to
Cashco cleaning standard #S-1576. Contact
factory for details.
4. Inspect all parts for damage and replace if
necessary. NOTE: Use only parts manufac-
tured and supplied by Cashco, Inc. for these
products. See Section VIII.
5. Install new seat retainer (13) with seat (12)
into body (1) cavity with the seat (12) facing
downward. Tighten seat retainer (13) to the
following torque value: ALL SIZES: 6.25 Ft-
lbs (8.47 Nm).
6. Reinstall diaphragm subassembly and spring
chamber subassembly per Section VI, Steps
B.9. – B.10.
7. Bench test unit for suitable operation. NOTE:
Regulators are not tight shutoff devices.
Even if pressure builds up beyond set point,
a regulator may or may not develop bubble
tight shutoff.
8. Pressurize with air and spray liquid leak de-
tector around body (1) and spring chamber
(6) to test for leakage. Ensure that an outlet
pressure is maintained during this leak test
of at least mid-range spring level; i.e. 2-100
psig (.14-6.9 Barg) range spring, 51 psig (3.5
Barg) test pressure minimum.

IOM-B2 5
SECTION VII
VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
Possible Causes Remedies
A. Oversized regulator; inadequate rangeability. A1. Check actual flow conditions, re-size regulator for minimum and maximum flow.
A2. Increase flow rate.
A3. Decrease regulator pressure drop; decrease inlet pressure by placing a throttling
orifice in inlet piping union.
A4. Install next step higher range spring.
A5. Before replacing regulator, contact factory.
2. Regulator inlet (upstream) too high.
Possible Causes Remedies
A. Regulator undersized. A1. Confirm by opening bypass valve together with regulator.
A2. Check actual flow conditions, re-size regulator; if regulator has inadequate
capacity, replace with larger unit.
B. Incorrect range spring (screwing in CW of
adjusting screw does not allow bringing
pressure level up to proper level).
B. Replace range spring with proper lower range.
C. Too much rise (build). C1. Review rise (build) expected.
C2. Contact factory.
3. Sluggish operation.
Possible Causes Remedies
A. Fluid too viscous. A. Heat fluid. Contact factory.

IOM-B26
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.
SECTION VIII

IOM-B2 7
Figure 2: Model B2
Repair Parts
Item No. Description Kit B
1 Body
2 Adjusting Screw
3 Knob Nut
4 Knob
5 Spring Button
6 Spring Chamber
7 Diaphragm Subassembly
7.1 Diaphragm ------------------------‡‡
7.2 Actuator Post with Seat (#8)--‡‡
7.3 Actuator Nut
7.4 Actuator Gasket -----------------‡‡
7.5 Actuator O-ring ------------------‡‡
10 Diaphragm Gasket ----------------- ‡‡
12 Seat ------------------------------------ ‡‡
13 Seat Retainer ------------------------ ‡‡
15 Range Spring
16 Spring Clip
21 Inline Filter---------------------------- ‡‡
39 Snap in cover
‡‡ Recommended Spare Part

IOM-B28
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 and given in Schedule 1 of The Equipment and Protective Systems
Indented for Use in Potentially Explosive Atmospheres Regulations 2016. 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 DIRECTIVE 2014/34/EU and THE EQUIPMENT AND PROTECTIVE SYSTEMS INTENDED FOR USE IN
POTENTIALLY EXPLOSIVE ATMOSPHERES REGULATIONS 2016
IOM ADDENDUM:

IOM-B2 9
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. B2-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
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