cashco 764P Installation guide

Outlet
@ P2
Port “B”
IAS @
60-100
psig
MODEL
764P
Port “A”
EXH
REV
SIG
“Output”
LOAD
P/P
Blowdown - Drain
Blowdown - Drain
(Shaded portion for steam/condensate systems)
PC
PI
PCV
Bypass
II. INSTALLATION
1. A block valve of the globe/needle type should
be installed at the location of the pressure
tapping. Ball, butterfly or gate valves are not
recommended.
2. Recommended sensing tap pipe size is 1/2"
(DN15).
3. Location of pressure sensing tap should be
in a zone not subject to flow disturbances.
Recommend a minimum of 10 pipe diameters
upstream and 10 pipe diameters downstream
from any elbow, tee, valve, etc. that disturbs flow.
4. A pressure gauge is recommended at the location
of each tapping. Differential pressure designs
may incorporate a differential pressure gauge.
5. A pigtail siphon is required for hot condensing
fluids, such as steam, to assure a liquid trap at
the controller. The siphon should be installed
as near to the pressure connection(s) on the
controller’s diaphragm housing as practical.
Figure 1: Recommended Piping Schematic for Pressure
Reducing Control Valve with Positioner
I. DESCRIPTION AND SCOPE
The Model 764P is a pressure controller used for sensing static pressure, and outputting a pneumatic signal
proportional to the deviation from the setpoint.
The Model 764PD is a differential pressure controller used for sensing two static pressures (“HIGH” and “LOW”),
and outputting a pneumatic signal proportional to the deviation from the setpoint.
With proper materials selection, the units are suitable for gaseous, liquid or steam service. Refer to Technical Bulletin
764P-TB for design conditions and selection recommendations.
Use of oxygen gas as the IAS for a 764P or 764PD is outside the scope of this IOM, and is considered “special
construction”.
Abbreviations Utilized:
CCW – Counter Clockwise P1 – Inlet Pressure P/P – Pneumatic-to-Pneumatic
CW – Clockwise P2 – Outlet Pressure REV – Revolution or Reverse
DIR – Direct PB – Proportional Band SIG – Signal
EXH – Exhaust PC – Pressure Controller SRV – Safety Relief Valve
IAS – Instrument Air Supply PCV – Pressure Control Valve TR – Condensate Trap
PI – Pressure Indicator V – Vent
SECTION I
MODEL 764P & 764PD
PNEUMATIC PRESSURE CONTROLLERS
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-764P / PD
02-20
TR
Supply
Supply @
P1
DIR
TR
Supply
Airset
SRV
PROCESS
Pigtail
Siphon
V
SECTION II
ISO Registered Company

IOM-764P / PD
2
Figure 3
With Option -23; Field Bracket Mounting to Structure
Field Pipe Nipple Mounted. Recommend pipe tap
on top or side of pipe.
Figure 4
Output Pipe Nipple Mounted to Model 2266 Control Valve
Figure 5
Field Pipe Nipple Mounted to Piping
6. It is recommended as a good practice to locate
the controller as close as practical to the pressure
tapping and at a similar elevation. For installations
where the controller was factory mounted on a
control valve unit, the pressure tapping should
be within 6 - 10 feet (2 - 3 meters) of the control
valve. (Remember to compensate for tappings
located above the elevation of the controller for
any liquid pressure head that may occur.)
7. The controller’s pneumatic output signal (SIG)
piping or tubing should be limited in length, and
consideration must be given for the ultimate
purpose of the SIG at its final destination. The
following are recommended practices:
8. 764P controllers may be mounted by various
methods:
Bracket Mounted. Includes a bracket with
machine screws to allow attachment to a fixed
structural appendage; requires specifying Option
-23. (This is the method utilized when the 764P/
PD is specified to be mounted to a control valve
actuator.)
Figure 2
Factory Bracket Mounted to Ranger QCT Control Valve
Purpose Tubing
Size Max Length*
SIG to Positioner 1/4" O.D. 100 ft.
SIG to Supply Booster 1/4" O.D. 100 ft.
LOAD to Actuator 1/4" O.D. 10 - 12 ft.
* Contact factory for longer lengths.

IOM-764P / PD 3
particles over 20 microns. Desiccant dried air
is absolutely required for outdoor installations
exposed to freezing temperatures.
14. For 764PD the system must be designed such that
the “HIGH” pressure is always at a higher value
than the “LOW” pressure is at the same time. If
the expected HIGH and LOW pressures reverse
with respect to each other, the unit will become
inoperative, and the output will increase towards
full IAS pressure of 18–20 psig (1.24–1.38 Barg).
Countersink hole
for #10-32 flat heat
machine screw.
Figure 6
Panel Mounted Assembly View
INSTALLED ASSEMBLY
(Bottom View)
PANEL CUTOUT
(Front View)
9. It is recommended that a 764PD be bracket or
panel mounted. A 764PD can be pipe nipple
mounted from 1/4" NPT connection.
10. Clean the piping and tubing of all foreign materials
including chips, burrs, dirt, etc., prior to use.
Use care in applying thread sealant or TFE tape
to prevent excess material from entering the
connecting pipe or tubing.
11. Controllers may be oriented in any position indoors.
Outdoors, recommended locations are with the
main longitudinal axis in a horizontal position,
or with the pneumatic sensor head directed
downwards. Exhibit care to assure rainwater is
prevented from entering the unused exhaust port
(Port A or Port B).
12. Connect piping/tubing per Tables 1 and 2.
13. 764P/PD’s can operate with a lubricated, non-
dried air supply. However, good practice and other
system components (airsets, relays, etc.) dictate
use of the highest quality air supply available.
If air can not be practically dried and bears oil,
coalescing filters should be utilized to remove
as much oil and water as possible, as well as
Panel Mounted. Not factory provided. Requires
field provision of a panel opening and support
bracket per the below dimensions:
* Common applications Uncommon applications
Adjusting Screw
Panel
#10-32 flat head
machine screw and nut
#10-32 machine
screws
TABLE 1
Controller 764P
Action
IAS to Port Direct Reverse
ASupply Exhaust
BExhaust Supply
Process
Pressures
Above Atm.
Pressure
Increase in
pressure Increases
output signal
Increase in
pressure Decreases
output signal
764PD
Increase in
differential pressure
Increases output
signal
Increase in
differential pressure
Decreases output
signal
Controller 764P
Action
IAS to Port Direct Reverse
BSupply Exhaust
AExhaust Supply
Vacuum
Process
Below Atm.
Pressure
Increase in
vacuum
Increases output
signal
Increase in
vacuum
Decreases output
signal
NOTE: 764PD cannot be utilized in vacuum service.
TABLE 2
Controller Pressure Reducing Applications Controller
Pressure
Adjustment
Actions
IAS to
Port
Control
Valve Controller
B * ATO-FC
(REVERSE)
Reverse-
Increase in pressure
decreases output
signal.
Valve "fails closed".
CW = - Pres
CCW = + Pres
AATC-FO
(DIRECT)
Direct-
Increase in pressure
increases output signal.
Valve "fails open".
CW = + Pres
CCW = - Pres
Back Pressure/Relief Applications
Actions
B * ATC-FO
(DIRECT)
Reverse-
Increase in pressure
decreases output
signal.
Valve "fails open".
CW = - Pres
CCW = + Pres
AATO-FC
(REVERSE)
Direct-
Increase in pressure
increases output signal.
Valve "fails closed".
CW = + Pres
CCW = - Pres

IOM-764P / PD
4
SECTION III
III. PRINCIPLE OF OPERATION
1. The 764 controllers employ laminar flow to
produce the 3-15 psig (nominal 0.2–1.0 Barg)
output signal. Laminar flow eliminates the need
for range springs, levers, pivots and other
parts that produce friction and lost motion.
2. The sensing diaphragm in the 764P and 764PD
has a high spring rate and any change in the
sensed pressure produces a minute diaphragm
movement which strokes the sensor plate.
The sensor plate, in turn, throttles the flow of
instrument air through the sensor to develop
the 3-15 psig (0.2-1.0 Barg) output signal.
3. On direct acting 764P controllers (see Figure 7)
the supply air enters PORT A and passes through
the proportional band restriction. With an increase
in the controlled pressure the flow through the
sensor is reduced which increases the output
signal. The proportional band restriction regulates
the flow rate of supply air into PORT A. PORT B
is the exhaust port. A 764PD operates the same.
4. On reverse acting 764P controllers (see Figure
8) the supply enters PORT B (not PORT A). With
an increase in the controlled pressure, the supply
air flowing through the sensor decreases, which
reduces the output signal. The proportional band
restriction regulates the flow of exhaust through
PORT A. A 764PD operates in a similar manner.
5. Closing (CW rotation) the proportional band
adjusting screw reduces the proportional band.
Openingthescrewincreasestheproportionalband.
6. The setpoint adjustment positions the sensor so
the diaphragm must deflect its maximum for its
highest controlled pressure setting and hardly
deflects for the lowest controlled pressure setting.
SUPPLY AIR
OUTPUT SIGNAL
EXHAUST (VENT)
LOWER SENSED PRESSURE
HIGHER SENSED PRESSURE
4
4
4
4
4
4
4
4

IOM-764P / PD 5
Do not rotate the needle valve (3) CW beyond this
location as the unit will be rendered inoperative.
Rotate needle valve (3) CCW approximately 1/8 of
a revolution increments at each adjustment. 1-1/2
revolutions are the maximum rotation available
from the 3 percent minimum PB position to the
20% maximum PB position.
SECTION IV
IV. STARTUP
1. Prior to pressurizing through the airset, disconnect
the instrument air supply (IAS) at the airset inlet,
open the IAS block valve and blow the piping clear
of any debris. Reconnect the piping and open the
isolation valve. Set the airset to 18 psig (1.2 Barg).
2. The unit is shipped with the proportional band
(PB) set at a minimum value of approximately 3
percent. Matchmarks are factory placed on the
housing (1) and the PB needle valve (3) head
approximately perpendicular to the screwdriver
slot of the needle valve (3) head.
4. Start the process, observing the output gauge of
the controller and the process pressure gauge.
(For 764PD's, always pressure the HIGH pressure
before the LOW pressure.) Assure that the output
is changing (decreasing from 18 psig (1.2 Barg)
if reverse acting, or increasing from 0 psig (0.0
Barg) is direct acting) as the controller approaches
setpoint. Confirm proper action of control valve.
Vary the process flow and observe the reaction
of the controller to the disturbances.
5. If the controller seems to be “hunting” with
overshoot and undershoot of setpoint, additional
PB should be added. Rotate the needle valve
(3) CCW in increments of 1/8 revolution. NOTE:
When PB is adjusted, setpoint will normally require
slight resetting; rotate the adjusting screw (2.3) as
required. Repeat until best stability is obtained, or
up to the maximum of 1-1/2 revolutions.
3. Units are factory calibrated to approximately mid-
range; i.e. 50-150 psig (3.4-10.3 Barg) range will
have setpoint at approximately 100 psig (6.9 Barg).
It is recommended that the unit be field calibrated
following installation and prior to startup. (See
Section VI. CALIBRATION for detailed procedure.)
Direct Action: Adjust setpoint by rotating
adjusting screw CCW to decrease setpoint or turn
CW to increase setpoint.
Reverse Action: Adjust setpoint by rotating
adjusting screw CW to decrease setpoint or turn
CCW to increase setpoint.
Always make adjustments in small increments and
wait until reactions can be observed before making
further adjustments.
6. If “hunting” persists after comple
tion of Step 5, the
controller can be slowed down by reducing airset
supply pressure down to 16 psig (1.1 Barg) in 1 psi
(0.07 Bar) increments. If this procedure is used,
repeat Step 5.
7. If “hunting” persists after completion of Step 6,
rotate the needle valve on the sensing line “towards
closed” to provide “snubbing” action. DO NOT
FULLY CLOSE SENSING NEEDLE VALVE.
SECTION V
V. MAINTENANCE
A. General:
1. Refer to Figure 12 for basic pressure controller.
Refer to Figure 13 for differential pressure
controller.
2. Maintenance procedures hereinafter are
based on removal from the process piping
system where installed. When removing the
tubing, put a tag on the tubing which port, “A”
or “B”, was utilized.
3. If complete overhaul is undertaken, it is
recommended that the pneumatic circuit
overhaul be completed prior to diaphragm
replacement.
4. Lightly grease all sensor sub-assembly (2)
O-rings (5) (6) upon replacement with lithium
grease; cloth wipe all excess grease.
B. Diaphragm Replacement:
1. If diaphragm (12) has cracked and leaked,
complete unit must be overhauled including
the pneumatic circuit portion.
CAUTION
CAUTION

IOM-764P / PD
6
7. Remove the three sensor O-rings (5) from the
sensor (2.1).
NOTE: Typically, additional dis-assembly of
the sensor sub-assembly (2) is not required.
If it is necessary to replace any of the sensor
sub-assembly parts (2.1, 2.2, 2.3, 2.4, 2.5) a
complete new sensor sub-assembly must be
installed. Contact the factory for assistance.
8. Take all the metal parts except the gauge (11)
and nameplate (10) and clean in suitable solvent.
Clean and air blow all drilled air passages.
9. Install pressure gauge (11) into the pneumatic
housing (1) using suitable thread sealant.
10. Install new O-rings (5) on sensor sub-assembly
(2). Check the two dimensions given in Figure 10
of the sensor sub-assembly as “final settings”.
2. Remove cap screws (19) and nuts (18). Remove
diaphragm upper case (13) and upper diaphragm
O-ring (16). Remove diaphragm (12), and SST
diaphragm cover (17) if supplied. Remove lower
case diaphragm O-ring (16) and pusher post O-ring
(23) for 764PD. Inspect for any corrosion damage
and/or permanent deformation of the diaphragm
(12) and diaphragm cover (17); if bent, replace.
3. For 764PD, separate at the screwed joint between
the diaphragm lower case (14) and the adapter (21)
turning the diaphragm case (14) CCW (viewed from
diaphragm case end). When separated, remove
the adapter O-ring (22) and replace. Reinstall the
adapter (21) and diaphragm lower case (14).
4. For the 764PD, replace diaphragm O-ring (16) for
the lower case (14) and the pusher post O-ring
(23).
5. Replace diaphragm (12) and diaphragm cover(s)
(17), if supplied. Assure that the diaphragm
cover (thin SST material) (17) is placed on
side(s) exposed to the process fluid(s). (764PD
requires both sides to be covered, if supplied with
diaphragm covers (17).
6. Replace with new upper case diaphragm O-ring
(16), upper case (13), and cap screws with nuts
(19 and 18).
7. Recalibrate per Section VI.
C. Pneumatic Circuit Overhaul:
1. Remove output pressure gauge (11) and test
calibration. If gauge is off ± 2 psi (±0.14 Bar)
recommend replacement.
2. Remove lower diaphragm case (14) from the
pneumatic housing (1) at the point where screwed
together. Rotate the diaphragm case (14) CCW
(viewed from diaphragm case end) to loosen.
For 764PD: Remove adapter (21) together with
lower diaphragm casing (14) at the screwed
joint between the pneumatic housing (1) and
the adapter (21). Rotate the adapter (21) CCW
(viewed from diaphragm case end) to loosen. Once
loosened, orient the unit along a horizontal axis
to prevent internal parts from falling from within
when separated. DO NOT REMOVE PUSHER-
POST (24) FROM 764PD.
3. Remove sensor plate (15.1) (15).
4. Remove nameplate screw (9), nameplate (10),
and four housing screws (8). Grasp the sensor
sub-assembly (2) end plate (2.2), and pull it
outwards from the housing (1). Watch for the
sensor pin (2.4) as the sensor sub-assembly
(2) is withdrawn, as pin (2.4) easily falls out and
could be lost.
Figure 9: Sensor Sub-Assembly (2)
5. Remove sensor plate O-ring (6).
6. Take note of the position of the PB needle valve
(3) by rotating it CW until it seats: count the
exact amount of rotation in 1/8 rev. increments;
record the count in Table 3. Remove the PB
needle valve (3) with O-ring (7) by rotating
CCW. Remove O-ring (7).
TABLE 3
Part DESCRIPTION
OF ROTATION
NO. OF
REVOLUTIONS
PB Needle
Valve (3)
No. of Revolutions rotated CW to
fully seat

IOM-764P / PD 7
X
5/16”
X = 1-27/32" (46.8mm) all ranges
except 50–150 psig = 1-25/32" (45.2mm)
Figure 10
Sensor Sub-Assembly
Assemble per these Dimensions
Figure 11
12. Install the nameplate (10) and nameplate
screw (9).
13. Install the PB needle valve (3) with a new
O-ring (7). Screw the needle valve (3) CW
until seated, then back out to same position
recorded in Table 3 prior to disassembly.
14. Place a new sensor plate O-ring (6) down into
the housing (1) cavity next to the end of the
sensor (2.1). Slide the sensor plate (15) into
the housing (1); the flat portion of the sensor
plate (15) should seat against the O-ring (6).
11. Slide the sensor sub-assembly (2) back into
the housing (1) so as not to damage the sensor
O-rings (5). The final position should have the
sensor pin (2.4) directly above the center of the
adjusting screw (2.3). Install the four end plate
screws (8). See Figure 11.
The rounded end of the sensor plate (15) will touch
the diaphragm (16) for the 764P, or the pusher post
(24) of the 764PD.
NOTE: The previous description is for 764PD’s and
764P’s in pressure ranges 2" - 30" Hg, 1-30 psig,
20-100 psig, 50-150 psig and 90-500 psig; it is
also for 764PD’s for differential pressure ranges
1-30, 20-100 and 50-150 psid. Refer to Figure 12
“Diaphragm Sub-Assembly for 450-2500 psig”.
Observe that the sensor plate (15) consists of a
four part sub-assembly as follows:
15.1 Sensor Plate
15.2 Adaptor
15.3 Retaining Ring
15.4 Spring
17. Re-engage the pneumatic housing (1) to the
diaphragm lower case (14) of the 764P, or
the adapter (21) of the 764PD; rotate CW.
Wrench tighten.
18. Calibrate per Section VI.

IOM-764P / PD
8
SECTION VI
SECTION VII
VII. TROUBLE SHOOTING GUIDE
Possible Cause Remedy
A. No air supply. A1. Check to see if air is available at airset.
A2. Check to see if airset filter and/or dripwell is plugged.
B. Improper action; port "A" or "B"
connections reversed.
B. Reference Tables 1 & 2 herein for desired action and proper
port; reverse as required.
C. Check process isolation valve and line to
see if open and/or clear.
C1. Open block needle valve on process.
C2. Disconnect piping/tubing at both ends, blow to determine
if obstructed. Carefully blow needle valve to clear obstruction;
use caution commensurate with fluid handled in accordance
with Owner's procedures.
D. Improper pressure tap location. D. For relief applications, tapping is upstream; for reducing
applications tapping is downstream of the control valve.
E. PB needle valve is fully closed. E. Open at east to alignment of matchmarks on valve's screw
head and housing.
F. Adjusting Screw is outside of operating
window.
F. Reset Adjusting Screw length to be 5/16" out from nameplate.
G. Ice formation. G. Use dry air as an IAS medium in cold weather. Thaw as
necessary by use of air heater. Trace as necessary.
H. Final element operation problem; i.e.
control valve, positioner, solenoid, etc. H. Reference instructions for operation of final element.
1. No controller response
VI. SHOP CALIBRATION
1. Install a 1/4" pipe plug in the “OUTPUT” port of
unit.
2. Provide an 18 psig (1.2 Barg) IAS to the proper
port as determined by Table 1, Section II.
3. Leave PB as set in Section V.C.13. If this
setting is unknown, rotate the PB needle valve
(3) CW until seated. Rotate needle valve (3)
CCW until “indented matchmarks” align; this is
approximately/8–1/4 of a revolution.
4.1. Provide a known pressure (compressed nitrogen,
etc.) equal to the desired setpoint to the diaphragm
“PROCESS” connection for the 764P.
4.2. For the 764PD, place a known static pressure
equal to the desired differential pressure setpoint to
the “HIGH” process connection; leave the “LOW”
process connection vented to atmosphere.
5.1. FOR DIRECT ACTION: If the output pressure
gauge is at/near 15 psig (1.03 Barg) increase the
setpoint by rotating the adjusting screw (2.3) CW
until the output decreases to 9 psig (0.62 Barg)
If the output pressure gauge is at/near 0 psig
(0.0 Barg) decrease the setpoint by rotating the
adjusting screw (2.3) CCW until the output rises
to 9 psig (0.62 Barg).
5.2 FOR REVERSE ACTION: If the output pressure
gauge is at/near 15 psig (1.03 Barg) decrease
the setpoint by rotating the adjusting screw (2.3)
CCW until the output decreases to 9 psig (0.62
Barg).
If the output pressure gauge is at/near 0 psig
(0.0 Barg) increase the setpoint by rotating the
adjusting screw (2.3) CW until the output rises
to 9 psig (0.62 Barg).
NOTE: If the unit cannot be shop calibrated to either
the upper or lower value of the stated range, refer
to statement in VII.7.A. for recommendation. Repeat
shop calibration.

IOM-764P / PD 9
Possible Cause Remedy
A. Insufficient PB A. Increase PB in 1/8 rev. increments by turning the needle valve
CCW. Reset setpoint as required (Max PB at 1-1/2 revs.).
B. Improper air supply.
B1. Supply pressure too high. Reduce airset output supply pres
sure to 15-18 psig.
B2. Air supply unsteady. Replace airset.
C. Pulsing process sensing.
C1. Snub process needle valve as far as practical without shutting
off. Observe process gauges carefully.
C2. Poor location of process pressure tap. Evaluate and consider
relocation.
D. Non-Correctible process dynamics.
D1. Bypass control valve positioner and directly load actuator.
D2. Review sizing of control valve, may be oversized. Use re
stricted trim if necessary.
D3. Consult factory
Possible Cause Remedy
A. Mismatch of pneumatic hardware. A. Check bench set of actuator. Consider positioner or
booster.
B. Improper action; port "A" or "B"
connections are reversed.
B. Reference Tables 1 and 2 herin for desired action
and proper port; reverse as required.
2. Improper control valve action.
Possible Cause Remedy
A. Restricted flow(s).
A1. Open process needle valve adequately. Disconnect tubing and
blow sensing line.
A2. Check equivalent output tubing line length against those
indicated herein in Section 11.7. Relocate controller, or
consider adding an air booster or positioner at the control
valve.
A3. Check for mashed or pinched tubing.
A4. Installation debris. Air blow line.
A5. Ice in lines. Use dry air supply.
B. Insufficient air supply. B. Increase supply up to 18-20 psig.
C. Too much PB. C. Decrease PB in 1/8 rev. increments. Reset setpoint as
required.
D. Improper range selection. D. Use the lowest range possible, if available to obtain the best
response.
E. Too large actuator. E. Add an air booster or positioner at the actuator.
F. Use of alcohols, glycols in freezing
weather; dissolved lubricant on O-rings. F. Remove sensor sub-assembly and lubricate O-rings.
Possible Cause Remedy
A. Sensing diaphragm loose at screwed
connection to housing or adapter.
A. Piping weight is cantilevered off of process connections or
instrument air connections causing unscrewing, and effecting
internal clearances. Change piping or add supports as required.
B. Bent sensing diaphragm. B. Inspect diaphragm; replace if bent. Bent diaphragm indicates an
overpressure condition; correct if necessary.
C. Air supply debris. C1. Provide a cleaner air supply or piping source.
C2. Ice in lines. Correct as necessary.
3. Erratic Operation; Rapid Cycling.
4. Sluggish operation; slow action.
5. Calibration Erratic; frequent setpoint adjustments.

IOM-764P / PD
10
SECTION VIII
Possible Cause Remedy
A. Improper sensor sub-assembly setting. A. Remove sensor sub-assembly. Check dimension to those
indicated in Figure 10. If dimension is correct, and high setting
cannot be reached, decrease dim. "X" by rotating sensor end
plate 1/2 revolution CW; reverse for lower setting.
7. Cannot reach upper or lower pressure levels of stated range.
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.
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.
6. Leakage of process fluid.
Possible Cause Remedy
A. Sensing diaphragm O-ring failure.
A1. Improper installation causing overheating by not provifing a
loop seal for hot condensing fluids; i.e. steam.
A2. Chemical attack. Consult factory.
B. For 764PD, pusher post O-ring failure. B1. Same as A1. above.
B2. Same as A2. above.
C. Diaphragm failure. C. Corrosive attack. Consult factory.

IOM-764P / PD 11
ITEM NO. DESCRIPTION
1 Housing
2 Sensor Sub-Assembly
2.1 Sensor *
2.2 End Plate *
2.3 Adjusting Screw *
2.4 Sensor Pin *
2.5 Retsainer Clip *
3 Needle Valve
5 O-Ring - Sensor
6 O-Ring - Sensor Plate
7 O-Ring - Needle Valve
8 End Plate Screw
9 Name Plate Screw
10 Name Plate
11 Gauge
Sensor Plate Sub-Assembly
450-2500 psig Range
ITEM NO. DESCRIPTION
12 Diaphragm
13 Upper Case
14 Lower Case
15 Sensor Plate Sub-Assembly
15.1 Sensor Plate
15.2 Adaptor
15.3 Retaining Ring
15.4 Spring
16 O-ring – Diaphragm
17 Diaphragm Cover (if supplied)
18 Nut
19 Screw
20 Vent Plug
* Not Sold as individual parts.
(Purchase Sensor Sub_Assembly 2)
Figure 12
Model 764P
Available Ranges
psig (Barg)
1-30 (0.7-2.1)
20-100 (1.4-6.9)
50-150 (3.5-10.3)
90-500 (6.2-34.5)
450-2500 (31.0-172.4)
2"-30" Hg Vac. (50-760 mm Hg Vac. )
Sensor Plate
Sub-Assembly

ITEM NO. DESCRIPTION
11 Gauge
12 Diaphragm
13 Upper Case
14 Lower Case
15 Sensor Plate
16 O-ring – Diaphragm
17 Diaphragm Cover (if supplied)
18 Nut
19 Screw
21 Adaptor
22 O-Ring – Adaptor
23 O-Ring – Pusher Post
24 Pusher Post
* Not Sold as individual parts.
(Purchase Sensor Sub-Assembly 2)
ITEM NO. DESCRIPTION
1 Housing
2 Sensor Sub-Assembly
2.1 Sensor *
2.2 End Plate *
2.3 Adjusting Screw *
2.4 Sensor Pin *
2.5 Retainer Clip *
3 Needle Valve
5 O-Ring - Sensor
6 O-Ring - Sensor Plate
7 O-Ring - Needle Valve
8 End Plate Screw
9 Name Plate Screw
10 Name Plate
Figure 13
Model 764PD
1/4" NPT
Tap
Available Ranges
1-30 psid (.07-2.1 Bard)
20-100 psid (1.4-6.9 Bard)
50-150 psid (3.5-10.3 Bard)

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-764P / PD
14
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
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. 764P/PD-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]