Cashco C-PRV User Manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL

IOM-C-PRV

12-13

MODEL C-PRV

PRESSURE REDUCING REGULATOR

SECTION I

I. DESCRIPTION AND SCOPE

Model C-PRV is a pressure regulator used to control downstream (outlet or P2) pressure. Inlet and outlet sizes
are 1", 1-1/2", 2" and 3" with Tri-Clamp® fi tting connections. This regulator is only suitable for liquids and gases at
temperatures less than 300°F (149°C). Refer to Technical Bulletin C-PRV-TB for specifi c design con di tions.

SECTION II

II. INSTALLATION

A. General:

1. An inlet block valve should always be installed
up stream of the regulator.

2. An outlet pressure gauge should be located
ap prox i mate ly ten pipe diameters down stream
and within sight.

3. All installations should include a downstream
re lief device if the inlet pressure could exceed
the pressure rating of any downstream equip­ ment.

4. Flow Direction: Install so fl ow enters through
the bottom connection and exits the side con­nection.

5. Install with spring chamber (2) in the vertical
up position to allow for proper draining.

III. PRINCIPLE OF OPERATION

A. General:

1. Movement occurs as pressure vari a tions reg is­ ter on the di a phragm. The registering pres sure
is the outlet, P2 or downstream pres sure. The
range spring op pos es diaphragm move ment.
As the outlet pressure drops, the range spring
pushes the diaphragm down, opening the port;

CAUTION

Installation of adequate overpressure pro tec tion is
recommended to pro tect the reg u la tor from overpres­sure and all down stream equip ment from damage
in the event of regulator failure.

SECTION III

as outlet pressure increases, the diaphragm
pushes up and the port opening closes.

2. A complete diaphragm failure will cause the
reg u la tor to fail open

CAUTION

The Model C-PRV should never be used as a shutoff
device.

IV. START-UP

A. General:

1. Ensure that lock-open pin (10) and hitch pin
(15) are in proper po si tion. See Sec tion VII.

SECTION IV

2. Confi rm that the proper range spring is in di -
cat ed to be within the regulator by inspection
of the unit’s nameplate. Apply setpoint pres­ sures that are only within the stated range.

3. When stating direction of rotation of the
nut or handle (6), the view is with respect to
look ing down towards the spring chamber or
its’ nor mal location.

4. Start with the block valve closed.

6. Slowly open the inlet (upstream) block valve
ob serv ing the outlet (downstream) pressure
gauge. De ter mine if the regulator is fl owing
and the downstream equip ment is operative.
Rotate the regulator nut or handle (6) CW
slowly until fl ow begins.

5. Relax range spring (7) by turning nut or handle
(6) counter-clockwise (CCW) until rotation
stops. Rotate nut or handle (6) clockwise (CW)
three (3) full revolutions to maintain spring
(7) to di a phragm assembly (16) contact. This
reduces the outlet pressure setpoint.

SECTION V

V. SHUTDOWN

A. In all cases the regulator should be shutdown by

slowly closing the inlet (upstream) block valve.

SECTION VI

VI. MAINTENANCE

WARNING

WARNING

SYSTEM UNDER PRESSURE. Prior to performing
any inspection and cleaning, isolate the regulator
from the system and relieve all pressure. Failure to
do so could result in personal injury.

A. General:

1. Unit’s lock-open feature allows this regulator
to be cleaned in-line, see Section VII.

7. Continue to slowly open the inlet (upstream)
block valve until fully open.

8. Develop system fl ow to a level near its ex-
pect ed normal rate and reset the regulator
setpoint by turning the nut or handle (6) CW
to increase outlet pressure or CCW to reduce
outlet pressure.

CAUTION

DO NOT DEAD-END FLOW DOWNSTREAM of the
Model C-PRV as internals may be damaged.

4. Refer to Figure 3 for basic regulator item
number reference ( ) and description.

B. Trim Replacement:

1. Securely install the bottom portion of the plug
(17) in a smooth jawed vise with the spring
chamber (2) directed upwards and the face
of the inlet fl ange of the body (1) resting on
the vise.

2. Maintenance procedures hereinafter are based
upon removal of regulator unit from the pipeline
where installed.

3. Owner should refer to owner’s procedures for
re mov al, handling, cleaning and disposal of
non-reuseable parts.

NOTE: For those fl uids which could create a
potential hazard to personnel working on this unit,
owner must provide an OSHA approved MSDS
(Material Safety Data Sheet), and a signed state­ ment attesting to the fact that the unit has been
fl ushed out, for a specifi c period of time, using an
OSHA acceptable neu tral iz ing agent. The name
of the agent, man u fac tur er’s name and total con­ cen tra tion level must also be included for both the
service medium as well as the neu tral iz ing agent.
Returns WILL NOT BE ACCEPTED by Cashco,
Inc. without an MSDS form at tached to the outside
of shipping carton.

2

SPRING UNDER COMPRESSION. Prior to re mov­ ing the clamp (13), relieve spring (7) compression.
Failure to do so may result in fl ying parts that could
cause per son al injury.

2. Relax range spring (7) by turning nut or handle

3. Remove socket head set screw (27) CCW

4. Pull hitch pin (15) and lift up nut or handle (6)

WARNING

(6) CCW until rotation stops. Count and record
the number of revolutions in the box below.

Number of revolutions required to relax
range spring: ________

from top end of guide post (18).

to remove.

IOM-C-PRV

CAUTION

Do not apply spring load or operate regulator with
hitch pin (15) removed from top of guide post (18).
Pre ma ture di a phragm failure will re sult.

5. Loosen thumbclamp screw (13) and remove.
a. For Opt-80: 2 piece clamp (13A): Loosen

and remove clamp nuts (13B), washers (13D),
bolts (13C) and clamps (13A). See Figure 1.

6. Place matchmarks between body (1) and
spring chamber(2) to assist in fi nal orientation
when reassembled.

7. Lift spring chamber (2) vertically up and off
guide post (18) and body (1) and set aside.

NOTE alignment of spring button (4) tab
(ears) with slot guides inside spring cham­ber (2).

8. Remove bearing seal (22). Lift up to remove
adjusting screw assembly (5), spring button
(4) and spring (7) off guide post (18).

9. Grasp cap (5.1) of adjusting screw assembly
with hand and lift up to separate cap (5.1) from
(5.3) to reveal and remove two u-cup seals
(5.4). Do Not remove dowel pin (5.2).

10. Install two new u-cup seals (5.4) into the ad­justing screw cap (5.1). Insert the fi rst u-cup
with the open side with the spring showing into
the hole in the cap. Ensure that the u-cup is
pressed all the way in. Look into the hole to
confi rm that the white seal material is show-
ing and not the spring material. Then press
second u-cup seal with white seal material
side in fi rst into the hole all the way in next to
the fi rst u-cup. (Spring side of u-cup should
be visible.

14. Remove pressure plate (3), diaphragm (16)
and diaphragm spacer (26). NOTE: Correct

orientation of spacer (26) has the side with
the I.D. radius facing towards the clamping
surface of the plug (17).

15. Inspect seating surface of plug. Replace plug
if surface is worn or damaged.

16. Clean parts in accordance with owner's speci­fi cations.

CAUTION

Owner’s cleaning solution must be com pat i ble with
regulator trim materials.

17. Install diaphragm spacer (26) on plug (17).
Place new diaphragm (16) with convolution
side facing up, onto plug (17) and fi t it around
the diaphragm spacer (26). Align tab on O.D.
of diaphragm (16) with the tab slot cut in the
body fl ange lip.

18. Lay pressure plate (3) on top of diaphragm
(16).

19. Apply Emhart Bostic White Food Grade "Never
Seeze" or equivelant to threaded end of plug
(17). Thread adapter nut (20) onto plug (17)
and tighten to 60 in-lbs of torque.

For 1" Investment Cast Body:

a. Install spacer (21).

b. Apply Loctite 242 or equivelant to set

screw (24). Thread set screw into adapter
nut (20) secure tight against plug (17).

c. Apply Emhart Bostic White Food Grade

"Never Seeze" or equivelant to the exter­nal threads of the adapter (20) and thread
guide post (18) securely to the adapter.

11. Slide adjusting screw cap (5.1) with new u-cup
seals (5.4) and adjusting screw (5.3) together,
use the dowel pin (5.2) for alignment. NOTE;

Top end of pin (5.2) should be fl ush with top
surface of adjusting screw cap (5.1). Place

new seal (22) on adjusting screw cap (5.1).
Set parts aside for fi nal assembly later.

12. Remove set screw (19) rotate CCW. Rotate
guidepost (18) CCW and remove.

For 1" Investment Cast Body:
a. Remove spacer (21).
b. Remove set screw (24) CCW.

13. Place a wrench on fl ats of the adapter nut(20)
and rotate CCW to remove.

IOM-C-PRV

20. Thread guide post (18) onto end of plug (17),
thighten fi rmly into place.

21. Apply Loctite 242 or equivelant to set screw
(19). Thread set screw tight into guide post
(18).

22. Position spring (7) over guide post (18) - rest­ing fl at on pressure plate (3).

23. Place spring button(4) with adjusting screw
assembly (5) and bearing (22) down over guide
post (18) into spring (7) cavity. Align one tab
(ear) on spring button (4) directly above tab
slot cut into the body fl ange lip.

3

NOTE: Apply a small amount of Emhart

Bostic White Food Grade “NEVER-SEEZ®” or
equiv a lent to threads of ad just ing screw (5) .

24. Align the two ribs inside the spring chamber
(2) with the tabs (ears) on the spring button
(4) and place the spring chamber (2) over as­sembled parts directly on body (1). Refer to
step 6 previous for alignment of match marks
for fi nal orientation.

NOTE: Gap be tween clamp (13A) halves should

be equal in size. See Figure 1.

25. Position the Tri-Clamp (13) around the mating
fl anges of the body (1) and the spring chamber
(2) with the threaded fastener aligned with
the tab slot cut in the body fl ange lip. Clamp
should be tightened to approximately 4 to 6
ft-lbs.

a. For Opt.-80: Position the clamp (13)

halves around the mating fl anges of the body
(1) and the spring chamber (2). Insert clamp
bolts (13C), wash ers (13D) and tighten clamp
nuts (13B) in alternating pattern. The clamp
should be tightened to approximately 4 to 6
ft-lbs.

VII. CLEANING PROCEDURE

A. Pre-Sanitation:

1. Owner should refer to owner’s op er at ing
pro ce dures for system shutdown to include
re liev ing all system pres sure.

2. Refer to Figure 3 for item number reference ().

3. Remove the lock-open pin (10) from the pin
retainer hole in the spring cham ber (2). (See
Figure 2.)

Figure 1: Clamp Arrangement.

26. Place nut or handle (6) onto square end of
adjusting screw assembly (5).

27. Insert hitch pin (15) through hole near the top
of the guide post (18). Apply Loctite 242 or
equivelant to set screw (27) and secure tight
into the top of the guide post (18).

28. Return to Section II. for Installation, Section
IV. for Start-up, and Sec tion VII for cleaning
procedure.

SECTION VII

CAUTION

Owner’s cleaning solution must be com pat i ble with
regulator’s trim materials.

NOTE: CIP is limited to 50 psig (3.45 Barg) maxi-
mum cleaning solution pres sure at 300°F (149°C).
SIP is recommended to 20 psig (1.38 Barg) sat u­ rat ed steam pressure; can withstand 30 psig (2.07
Barg), but may reduce elastomer life expectancy.

C. Post-Sanitation:

B. Sanitation:

4

4. System internal pressure must be at/near 0
psig (0 Barg). This will ensure plug (17) is fully
open. NOTE: Do not change range spring

(7) setting by rotating nut or handle (6).

5. Insert pin (10), jostle nut or handle (6) lift up
or push down to secure pin (10) thru ad just ing
screw (5).

1. Flush, drain and sanitize system in ac cor dance
to owner’s spec i fi ca tions.

1. Prior to system start-up, remove the lock­open pin (10) from the adjusting screw (5)
and insert it into the pin retainer hole. Unit
is again operative at the setpoint established
prior to cleaning.

Figure 2: Spring Chamber in Lock-Open Position

IOM-C-PRV

SECTION VIII

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 refl ects revision level for the product).

–

NEW REPLACEMENT UNIT:

Contact your local Cashco, Inc., Sales Rep re sen­ ta tive 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.

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.

PARTS "KIT" for FIELD REPAIR:

Contact your local Cashco, Inc., Sales Rep re sen­ ta tive 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.

–

7

NOTE: Those part numbers that have a quantity indicated

under "Spare Parts" in column "A” refl ect 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 cross­sectional drawings included in this manual for part
identifi cation and selection.

A Local Sales Representative will provide quotation
for appropriate Kit Number, Price and Availability.

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 specifi cations 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-C-PRV

5

Figure 3

Forged Body shown above

See the next page for Item Number Descriptions.

6

IOM-C-PRV

Figure 4

1" Investment Cast Red. Port shown above

NOTE: This product is to be installed with the spring chamber in the vertical position.

Item No. Description

1 Body
2 Spring Chamber
3 Pressure Plate
4 Spring Button
5 Adjusting Screw

5.1 Adjusting Screw Cap

5.2 Pin

5.3 Adjusting Screw

5.4 U-Cup Seal (2 pcs.)
6 Nut - Handle
7 Spring
13 Clamp
15 Pin (Cotterless Hitch)

IOM-C-PRV

Item No. Description
16 Diaphragm
17 Plug
18 Guide Post
19 Set Screw
20 Adapter / Nut
21 Guide (Spring) / Spacer
(1" & 1-1/2" Red. Port Only)
22 Bearing (Soft Seal)
24 Set Screw (Investment cast only.)
(Set Screw not needed for C-PRV
with comp seat.)
26 Diaphragm Spacer
27 Set Screw

Not Shown:

Item No. De scrip tion

8 Connector
9 Ball Chain
10 Quick Release Pin
11 Name Plate
12 Drive Screw
14 3A Symbol Plate
23 Diaphragm Cover
25 Diaphragm Gaskt (LG Trim)

7

Cashco, Inc.
P.O. Box 6
Ellsworth, KS 67439-0006
PH [phone]
Fax. # [phone]
www.cashco.com
email: [e-mail]

Printed in U.S.A. IOM-C-PRV

Cashco GmbH
Handwerkerstrasse 15
15366 Hoppegarten, Germany
PH [phone]
Fax. No. [phone]
www.cashco.com
Email: [e-mail]

Cashco do Brasil, Ltda.
Al.Venus, 340
Indaiatuba - Sao Paulo, Brazil
PH [phone]
Fax. No.
www.cashco.com
Email: [e-mail]