Cashco C-CS User Manual

INSTALLATION, OPERATION, & MAINTENANCE MANUAL

IOM-C-CS

12-13

MODEL C-CS

“CLEAN STEAM”

PRESSURE REDUCING REGULATOR

SECTION l

I. DESCRIPTION AND SCOPE

Model C-CS is a pressure reducing regulator used to control down stream (outlet or P2) pressure. Inlet and outlet sizes
are 3/4" (DN20), 1" (DN25), 1-1/2" (DN40), 2" (DN50) and 3" (DN80) with Tri-Clamp® fi tting connections. This regula-
tor is primarily designed for steam service at tem per a tures equal to or less than 366°F (185°C); this cor re sponds to
150 psig (10.3 Barg) sat u rat ed steam; however the unit may also be used for clean gaseous or liquid applications.

CAUTION

The Model C-CS should never be used as a shut-off device.

SECTION II

II. INSTALLATION

Outlet
@ P2

1. An inlet block valve should always be in stalled.

2. If service application is continuous such that
shutdown is not readily accomplished, it is
recommended that inlet and outlet block valves
and a manual bypass valve be in stalled.

3. An outlet pressure gauge should be lo cat ed
ap prox i mate ly ten pipe diameters down stream
and within sight.

Inlet

@ P1

Blowdown Drain

SRV

Bypass

Model C-CS

Reducing Regulator

Blowdown Drain

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

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

6. Install in a well drained pipe, properly trapped,
with spring chamber (2) in the vertical position
to allow for proper drain ing.

III. PRINCIPLE OF OPERATION

1. Movement occurs as pressure variations reg­ is ter on the diaphragm. The registering pres­ sure is the outlet, P2 or down stream pressure.
The range spring opposes di a phragm move­ ment. As the outlet pressure drops, the range
spring pushes the diaphragm down, opening

(Recommended Piping Schematic for Pressure Reducing Station)

7. For insulated piping systems, the regulator
should not be insulated.

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.

SECTION III

CAUTION

Do not apply spring load or operate regulator with
hitch pin (21) removed from top of guide post (27 ).
Pre ma ture di a phragm failure will re sult.

the port; as outlet pressure in creas es, the
diaphragm pushes up and the port closes.

IV. START-UP

NOTE: The regulator set point must be set

under normal fl owing conditions.

1. CCW = Counter Clockwise,
CW = Clockwise.

2. Inspect the unit's nameplate to confi rm that
the proper range spring is installed in the
reg u la tor. Apply setpoint pres sures that are
only within the stated range.

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

SECTION IV

7. Slowly open the inlet (upstream) block valve
ob serv ing the outlet (downstream) pressure
gauge. De ter mine if the regulator is fl owing
(see NOTE above step 1). If no fl ow, rotate the
reg u la tor handle (6) CW (viewed from above)
until fl ow begins. De ter mine if downstream
equip ment is in operation.

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

3. Start with the block valves closed. A bypass
valve may be used to maintain outlet pressure
in the down stream system while performing
the following steps.

4. Relax compression of range spring (7) by
turning handle (6) counter-clockwise (CCW)
until rotation stops. Rotate handle (6) clock­wise (CW) three (3) full revolutions to maintain
spring (7) to di a phragm(17) contact. This
reduces the outlet pres sure setpoint.

5. If piping system includes a bypass valve,
slowly open the bypass valve to preheat the
system piping and to allow slow expansion of
the piping. Ensure proper steam trap op er a­ tion, if installed. To prevent overpressurization,
closely mon i tor out let (down stream) pressure
with a gauge. NOTE: If no bypass valve is

installed, extra caution should be used in
starting up a cold system; i.e. do everything
slowly.

6. Crack open the outlet (downstream) block
valve.

9. Continue to slowly open the outlet (down­ stream) block valve. When fl ow is es tab lished
steady enough that the outlet (down stream)
block valve is fully open, begin to slowly
close the bypass valve, if installed, until fully
closed.

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

11. Reduce system fl ow to a minimum level and
observe setpoint. Outlet pressure will rise from
the setpoint of Step 10. The max i mum rise
in outlet pressure on de creas ing fl ow should
not exceed the stated upper limit of the range
spring by greater than 30%; i.e. 10-30 psig
(.69-2.1 Barg) range spring – at low fl ow the
outlet pres sure should not ex ceed 39 psig (2.7
Barg). If it does, consult factory.

SECTION V

V. SHUTDOWN

1. On systems with a bypass valve, and where
system pressure is to be main tained as the
reg u la tor is shutdown, slow ly open the by pass
valve while closing the inlet block valve. Fully
close the inlet block valve. When on bypass,
the system pres sure must be con stant ly ob­ served and man u al ly reg u lat ed.

2 IOM-C-CS

2. If the regulator and system are to both be
shut down, slowly close the inlet block valve.
Close the outlet valve only if reg u la tor re mov al
is required.

CAUTION

DO NOT DEAD-END FLOW DOWN STREAM of the
Mod el C-CS as overpressurizing reg u la tor may
damage internals.

SECTION VI

VI. MAINTENANCE

WARNING

SYSTEM UNDER PRES SURE. Prior to per form ing
any maintenance, isolate the reg u la tor from the
sys tem and relieve all pressure. Failure to do so
could result in personal injury.

A. General:

1. Maintenance procedures here in af ter are
based upon removal of the regulator unit from
the pipeline where installed.

2. Refer to Figure 2 for basic regulator item
num ber reference ( ) and description.

B. Diaphragm – Trim Replacement:

1. Securely install the regulator in a soft-jawed
vise with the spring chamber (2) di rect ed up­wards. Ensure that the body (1) is not held in
the vise by the Tri-clamp® fi tting con nec tions.
The regulator may be held in the vise with
fl ats on the plug (14). If this method is used,
ensure that the plug (14) is in contact with the
seating area of the body (1) and the face of
the inlet fl ange of the body (1) is resting on
the vise.

WARNING

SPRING UNDER COMPRESSION. Relieve all
spring (7) compression prior to removing clamp
(13). Failure to do so may result in fl ying parts that
could result in personal injury.

2. Relax range spring (7) by turning handle (6)
CCW (viewed from above) until rotation stops.
Count and record the number of rev o lu tions
in the box below:

Number of revolutions required to relax
range spring: ________

4. Pull hitch pin (21) and lift up on handle (6) to
remove.

5. Loosen and remove clamp nuts (13B), wash­ ers (13D), bolts (13C) and clamps (13A). See

Figure 1.

6. Place matchmarks between body (1) and
spring chamber (2) to assist in fi nal ori en ta-
tion when re as sem bled. Lift spring chamber
(2) vertically up and off of body (1) and above
guide post (27) to remove. Note alignment of
spring button (4) tabs (ears) with respect to
slot guides inside spring chamber (2).

7. Remove bearing (26). Lift up and remove ad­ just ing screw cap (25.7) and dowel pin (25.8)
as sem bly. NOTE: May need to tap lightly on

O.D. of adjusting screw (25.6) to free Dowel
pin (25.8) from adjusting screw (25.6).

NOTE: The two guide seals (25.9) may/may

not be extracted with as sem bly (25.7,25.8).

Re move guide seals (25.9).

8. Lift up to remove the ad just ing screw (25.6 )
and spring but ton (4) as an as sem bly. NOTE:

Do not rotate or re move spring button (4) from
ad just ing screw (25.6). Re move spring (7) and

lay aside.

9. Secure the pres sure plate assembly (27,28
and 29) at the “fl ats” near the base of pressure
plate (28). Grasp the lower portion of the plug
(14) by the “fl ats”, which protrudes from the
body (1) inlet, with soft-jawed pliers or soft­jawed vice and pro ceed to turn CCW (viewed
from above) for dis as sem bly. NOTE: Main tain

fi rm grasp of plug (14). After dis en gage ment,
plug (14) could fall out of body (1) and damage

seating surface area. Remove plug (14).

10. Remove pressure plate assembly (27,28 and

29) and lay aside. NOTE: The travel of the

guide post (27) has been factory set. Do not
loosen or adjust the hex nut (29) on pres sure
plate assembly (27,28,29).

11a. For Model C-CS :

Remove diaphragm (17), O-ring (16), dia-

phragm gas ket (15) and body (1).

11b. For Model C-CS with Opt.-11:

CAUTION

Do not apply spring load or operate regulator with
hitch pin (21) removed from top of guide post (27 ).
Pre ma ture di a phragm failure will re sult.

3. Remove socket head set screw (30) CCW
from top end of guide post (27).

IOM-C-CS 3

Remove diaphragm (17), diaphragm gaskets

(15), O-ring (18), seal (19), push er plate (20),
O-ring (16) and body (1).

12. Inspect plug (14) and seating surface of body
(1) for excessive wear. Replace all worn
parts.