cashco DL Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 2
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DO NOT HYDROSTATIC TEST THROUGH AN
IN STALLED UNIT; ISOLATE REGU LA TOR FROM
TEST. The upper range spring pressure level listed
on the nameplate or 100 psig (6.9 Barg) minimum
is the rec om mend ed "upper op era tive lim it" for
the sens ing dia phragm (see Sec tion IV. Startup,
Num ber 7.) Higher pres sures could cause in ter nal
dam age. In addition, note on the name plate that the
Inlet and Outlet pres sure and tem pera ture ratings
are at dif fer ent levels.
10.B. Model D Cryogenic Regulator - Option D-5 or D-36
III. PRINCIPLE OF OPERATION
1.
Movement occurs as pressure variations register
on the diaphragm. The registering pressure is the
outlet, P
, or downstream pressure. The range
2
spring or loading pressure (Opt.-20) op pos es
di a phragm movement. As outlet pressure drops,
IV. STARTUP
1.
Start with the block valves closed. A bypass valve
may be used to maintain outlet pres sure in the
downstream sys tem without chang ing the fol low ing
steps.
2.
Relax the range spring by turning the ad just ing screw
counter clockwise (CCW) a min i mum of three (3) full
revolutions or reduce loading pressure (Opt.-20).
This re duc es the outlet (down stream) pres sure set
point.
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 installed. Close ly monitor outlet (down stream)
pres sure via gauge to en sure not over-pres sur iz ing.
NOTE: If no bypass valve is installed, extra caution
should be used in start ing up a cold system; i.e. do
ev ery thing slow ly.
4.
Crack open the outlet (downstream) block valve.
5.
Slowly open the inlet (upstream) block valve
ob serv ing the outlet (downstream) pressure gauge.
Determine if the reg u la tor is flowing. If not, slowly
rotate the regulator adjusting screw (6) clock wise
(CW) or increase loading pressure (Opt.-20) until
flow begins.
2
CAUTION
a.
Recommended installation is with spring cham-
ber hang ing directly below the body in a vertical
down wards ori en ta tion. Al lows water to drain;
i.e. condensation.
b.
Recommend inert purge gas to spring cham ber
through vent hole and out drain hole.
11. Regulators are not to be di rectly bur ied under ground.
12. For insulated piping systems, rec om men da tion is to
not insulate regulator.
13. Spring Chamber Vent Tap - Pipe spring chamber
vent opening to remote lo ca tion. Orient so as not to
take on rainwater.
SECTION III
the range spring or loading pressure pushes
the dia phragm down, opening the port; as outlet
pres sure in creas es, the diaphragm push es up and
the port opening closes.
2.
A complete diaphragm failure will cause the
reg u la tor to fail open.
SECTION IV
6.
Continue to slowly open the inlet (upstream) block
valve until fully open.
7.
Continue to slowly open the outlet (downstream)
block valve, especially when the downstream pip ing
system isn't pressurized. If the outlet (down stream)
pressure exceeds the desired pres sure, close the
inlet (upstream) block valve and go to Step 2, then
return to Step 4.
8.
When flow is established steady enough that the
outlet (downstream) block valve is fully open, begin
to slowly close the bypass valve if installed.
9.
Develop system flow to a level near its expected
normal rate, and reset the regulator set point by
turning the adjusting screw (6) CW to increase outlet
pressure, or CCW to reduce outlet pressure.
10. Reduce system flow to a minimum level and ob serve
set point. Outlet pressure will rise from the set point
of Step 9. The maximum rise in outlet pressure on
decreasing flow should not exceed the stated upper
limit of the range spring by greater than 10%; i.e. 10-
40 psig (.69 - 2.8 Barg) range spring, at low flow the
outlet pres sure should not exceed 44 psig (3 Barg),
if it does, consult factory.
IOM-D/DL