Cashco 123 - Manual (Page 2)

IOM-123-BASIC 2
SECTION IV
10.A. Basic Regulator- (See Figure 1): Regulator may be
rotated around the pipe axis 360°. Rec om mend ed
po si tions are with spring cham ber ver ti cal upwards,
or hori zon tal. Orient such that the spring chamber
vent hole does not collect rain wa ter or debris.
10.B. Cryogenic Regulator -
Option-5 or -36 (See Fig ure 2):
a. Recommended installation is with spring cham-
ber hang ing vertical downward below the body.
This method allows water to drain; i.e. rain wa-
ter.
b. Recommend inert purge gas to spring cham ber
through vent hole and out drain hole.
SECTION III
III. PRINCIPLE OF OPERATION
1. Movement occurs as pressure variations reg is ter on
the diaphragm. The registering pressure is the inlet,
P
1
or upstream pressure. The range spring opposes
dia phragm move ment. As inlet pressure drops, the
7. Observing the inlet (upstream) pressure gauge,
ro tate the ad just ing screw 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 ex ceeds
the desired set point pressure, rotate the adjusting
screw CCW until the pressure decreases.
9. When fl ow 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 fl ow to a level near its expected nor-
mal rate, and reset the regu la tor set point by turning
the ad just ing screw CW to increase inlet pressure,
or CCW to reduce inlet pressure.
11. Reduce system fl ow to a minimum level and observe
set point. Inlet pressure will rise from the setpoint
of Step 9. (Ensure that this rise does not exceed
the stated upper limit of the range spring by greater
than 50%, i.e. 30 - 80 psig (2.1 - 5.5 Barg) range
spring, at maximum fl ow the inlet pressure should
not ex ceed 1.5 x 80 psig (5.6 Barg), or 120 psig (8.3
Barg). If it does, consult factory.)
12. Increase fl ow to maximum level if possible. Inlet
(up stream or P
1
) pressure should fall off. Readjust
setpoint as necessary at the normal fl ow rate.
IV. STARTUP
1. Start with the block valves closed. A bypass valve
may be used to maintain inlet pressure in the
up stream system without chang ing the following
steps.
2. Relax the range spring by turning the adjusting
screw counterclockwise (CCW) a minimum of three
(3) full revo lu tions. This reduces the inlet (upstream)
pres sure 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 ex pan sion
of the piping. Ensure proper steam trap operation
if in stalled. Closely mon i tor inlet (up stream) pres-
sure, via gauge, to assure not over-pres sur iz ing.
NOTE: If no bypass valve is in stalled, extra caution
should be used in starting up a cold system; i.e. do
ev ery thing slowly.
4. Crack open the inlet (upstream) block valve.
5. Slowly open the outlet (downstream) block valve
ob serv ing the inlet (upstream) pressure gauge. De-
ter mine if the regulator is fl owing. If not, slowly ro-
tate the regulator adjusting screw counter clock wise
(CCW) until fl ow be gins.
6. Continue to slowly open the outlet (down stream)
block valve until fully open.
range spring pushes the dia phragm down, closing
the port; as inlet pressure in creases, the dia phragm
pushes up and the port opens.
2. A complete diaphragm failure may cause the regu-
lator to fail closed.
WARNING 1
The maximum inlet pressure is equal to 1.5 times the
larger number of the stated range spring on the name-
plate, and is the recommended “upper operative limit” for
the sensing diaphragm. Higher pressures could dam age
the diaphragm. (Field hydro static tests fre quent ly de stroy
diaphragms. DO NOT HYDRO STATIC TEST THROUGH AN
IN STALLED UNIT; ISO LATE FROM TEST.)
11. Regulators are not to be direct buried un der -
ground.
12. For insulated piping systems, rec om men da tion is to
not in su late reg u la tor.