cashco SA1 설치, 운영 및 유지보수 매뉴얼 - 페이지 2

{카테고리_이름} cashco SA1에 대한 설치, 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. cashco SA1 12 페이지. Ultra high purity, spring loaded pressure reducing regulators

페이지 인쇄

IV. PRINCIPLE OF OPERATION

1. Movement occurs as pressure variations register

on the diaphragm. The registering pressure is the

outlet, P2, or downstream pressure. The range

spring op pos es di a phragm movement. As outlet

pressure drops, the range spring pushes the di a-

phragm down, opening the port; as outlet pres sure

V. STARTUP

Start with the block valves closed.

2. Relax the range spring by turning the ad just ing

screw (1) CCW (viewed from above) a minimum

of three (3) full rev o lu tions. This reduces 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 preheat the system piping and to allow slow

ex pan sion of the piping. Closely monitor outlet

(down stream) pressure via gauge to ensure not

over-pressurizing. NOTE: If no bypass valve is

in stalled, extra caution should be used in start ing

up a cold system; i.e. do everything slowly.

Do not walk away and leave a bypassed reg u la tor

unattended!

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

5. Slowly open the inlet (upstream) block valve to

about 25% open, observing the outlet (down-

stream) pres sure gauge. Determine if the reg u-

la tor is flowing. If not, slowly rotate the regulator

ad just ing screw (1) CW (viewed from above) until

flow be gins.

VI. SHUTDOWN

1. Shutoff inlet block valve.

2. Allow sufficient time for the line pressure down-

stream of the inlet block valve to bleed down.

3. Shutoff the outlet block valve.

CAUTION

SECTION IV

increases, the diaphragm pushes up and the port

opening closes.

2. A complete diaphragm failure will cause the reg u-

la tor to fail open and fluid will discharge from the

spring chamber vent hole.

SECTION V

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 block valve and go to Step 2. Close

bypass valve approximately 25%, and re peat

pro ce dure.

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 (1) CW to increase

outlet pressure, or CCW to reduce outlet pres sure.

10. Reduce system flow to a minimum level and ob-

serve pressure 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%. If it does, consult factory.

SECTION VI

4. Relieve the trapped upstream and down stream

pres sure.

5. The regulator may now be disassembled for

inspection and pre ven ta tive main te nance while

in-line.

IOM-CA1/SA1