Cashco 2171 - Manual (Page 2)

2 IOM-1171/2171
8. Flow Di rec tion: In stall so the fl ow di rec tion
match es the arrow cast on the body. Connect
the inlet pres sure to the body side connection(s).
Fluid will relieve out of the bottom connection. The
double inlet con nec tions are for in-line in stal la tion
(plug one side connection if in-line in stal la tion is
not re quired).
9. Regulator may be installed in a vertical or hor i -
zon tal pipe. If it is a steam system, assure the
piping is properly trapped and oriented.
10.A. Basic Regulator - (Refer to Figure 1, Model 1171
or 2171): Regulator may be rotated around the
pipe axis 360°. Rec om mend ed position is with
spring chamber ver ti cal upwards. Orient such
that the spring chamber vent hole does not col-
lect rainwater.
10.B. Cryogenic Regulator - Options 1171-5 and 2171-36
(Refer to Figure 2, Model 1171 or 2171):
1. Start with the block valves closed. A bypass valve
may be used to maintain inlet pressure in the up-
stream system without changing the fol low ing
steps.
2. Relax the range spring by turning the adjusting
screw counter clockwise (CCW) a minimum of
three (3) full revolutions. This reduces the inlet
(up stream) pressure 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. Assure proper steam
trap operation if installed. Closely monitor inlet
(up stream) pres sure via gauge to assure not
over-pressurizing. NOTE: If no bypass valve is
in stalled, extra caution should be used in starting
up a cold system; i.e. do everything 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
rotate the regulator adjusting screw counter clock-
wise (CCW) until fl ow begins.
6. Continue to slowly open the outlet (downstream)
block valve until fully open.
IV. START-UP 7. Observing the inlet (upstream) pressure gauge,
ro tate the adjusting screw clockwise (CW) slowly
until the inlet pres sure 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 exceeds
the desired setpoint pressure, rotate the ad just ing
screw CCW until the pres sure 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
normal rate, and reset the regulator setpoint by
turn ing the ad just ing screw CW to increase inlet
pressure, or CCW to reduce inlet pressure.
11. Using a downstream valve, reduce system fl ow to
a min i mum level and ob serve setpoint. Inlet pres-
sure will rise from the setpoint of Step 9. (Ensure
this rise does not exceed the stated upper limit of
the range spring (16) by greater than 50%, i.e. 20-
80 psig (1.4 - 5.5 Barg) range spring, at maximum
fl ow the inlet pres sure should not exceed 1.5 x 80
psig (5.5 Barg), or 120 psig (8.3 Barg). If it does,
consult factory).
12. Increase fl ow to maximum lev el, if possible. Inlet
(up stream or P
1
) pressure should fall off. Re ad just
setpoint as necessary at the normal fl ow rate.
SECTION III
1. Movement occurs as pressure variations register
on the diaphragm. The registering pressure is
the inlet, P
1
, or upstream pressure. The range
spring opposes diaphragm movement. As inlet
pressure drops, the range spring pushes the dia-
III. PRINCIPLE OF OPERATION phragm down, closing the port; as inlet pres sure
in creas es, the diaphragm pushes up and the port
opens.
2. A complete diaphragm failure will cause the reg u -
la tor to fail closed.
SECTION IV
a. Recommended installation is with spring
cham ber hang ing directly below the body in a
ver ti cal down wards orientation. Allows water
to drain; etc.
b. Recommend inert purge gas to spring cham-
ber through vent hole and out drain hole.
11. Regulators are not to be direct buried un der -
ground.
12. For insulated piping systems, rec om men da tion is
to not insulate regulator.
13. Spring Chamber Vent Tap – Option -25: Pipe
spring chamber vent opening to remote lo ca tion.
CAUTION
Installation of adequate overpressure pro tec tion is recom-
mended to pro tect the reg u la tor from over pres sure and
all down stream equip ment from damage in the event of
regulator failure.