cashco 1171 Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 2
Переглянути онлайн або завантажити pdf Посібник з монтажу, експлуатації та технічного обслуговування для Контролер cashco 1171. cashco 1171 8 сторінок. Back pressure / relief regulators
Друкувати сторінку
8. In stall so the flow 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 collect
rainwater.
10.B. Cryogenic Regulator - Options 1171-5 and 2171-36
(Refer to Figure 2, Model 1171 or 2171):
III. PRINCIPLE OF OPERATION
1. Movement occurs as pressure variations register
on the diaphragm. The registering pressure is
the inlet, P
, or upstream pressure. The range
1
spring opposes diaphragm movement.
inlet pressure drops, the range spring pushes
IV. START-UP
1. Start with the block valves closed. A bypass
valve may be used to maintain inlet pressure
in upstream system without changing 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 flowing. If not, slowly
rotate the regulator adjusting screw counter
clock wise (CCW) until flow begins.
6. Continue to slowly open the outlet (downstream)
block valve until fully open.
2
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.
Installation of adequate overpressure pro tec tion is
recommended 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.
SECTION III
the dia 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
As
reg u la tor to fail closed.
SECTION IV
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 flow 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 flow 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 flow
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 flow 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 flow to maximum lev el, if possible. Inlet
(up stream or P
setpoint as necessary at the normal flow rate.
CAUTION
) pressure should fall off. Re ad just
1
IOM-1171/2171