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.
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