cashco 8310HP 설치, 운영 및 유지보수 매뉴얼 - 페이지 2

{카테고리_이름} cashco 8310HP에 대한 설치, 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. cashco 8310HP 8 페이지. Pressure reducing regulators
cashco 8310HP에 대해서도 마찬가지입니다: 설치, 운영 및 유지보수 매뉴얼 (10 페이지)

페이지 인쇄

10. Basic Regulator - (Refer to Figure 1): Regulator may

be rotated around the pipe axis 360°. Recommended

position is with spring chamber vertical upwards. Orient

such that the spring chamber vent hole does not collect

rainwater or debris.

11. Regulators are not to be direct buried underground.

12. For insulated piping systems, recommendation is to not

insulate regulator.

III. PRINCIPLE OF OPERATION

Movement occurs as pressure variations register on the

diaphragm. The registering pressure is the outlet P

or downstream pressure. The range spring opposes

diaphragm movement. As outlet pressure drops, the

IV. START-UP

Start with the block valves closed. A bypass valve may

be used to maintain outlet pressure in the downstream

system without changing the following steps.

Relax the range spring by turning the adjusting screw

counter clockwise (CCW) (viewed from above) a min-

imum of three (3) full revolutions. This reduces the

outlet (downstream) pressure setpoint.

If it is a "hot" piping system, and equipped with a by-

pass valve, slowly open the bypass valve to preheat

the system piping and to allow slow expansion of the

piping. Ensure proper steam trap operation, if installed.

Closely monitor outlet (downstream) pressure via gauge

to ensure not over-pressurizing. NOTE: If no bypass

valve is installed, extra caution should be used in start-

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

Crack open the outlet (downstream) block valve.

Slowly open the inlet (upstream) block valve observing

the outlet (downstream) pressure gauge. Determine if

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

adjusting screw clockwise (CW) (viewed from above)

until flow begins.

Continue to slowly open the inlet (upstream) block valve

until fully open.

V. SHUTDOWN

On systems with a bypass valve, and where system

pressure is to be maintained as the regulator is shut

down, slowly open the bypass valve while closing the inlet

(upstream) block valve. Fully close the inlet (upstream)

block valve. (When on bypass, the system pressure

must be constantly observed and manually regulated.)

Close the outlet (downstream) block valve.

DO NOT HYDROSTATIC TEST THRU AN INSTALLED

UNIT; ISOLATE REGULATOR FROM TEST. The upper

range spring pressure level listed on the nameplate is

the recommended "upper operative limit" for the sensing

diaphragm (see Section IV. Start-up, Number 7.) Higher

pressures could cause internal damage. In addition, note

on the nameplate that the Inlet and Outlet pressure and

temperature ratings are at different levels.

SECTION III

range spring pushes the diaphragm down, opening

the ports; as outlet pressure increases, the diaphragm

pushes up and the port opening closes.

A complete diaphragm failure will cause the regulator

to fail open.

SECTION IV

Continue to slowly open the outlet (downstream) block

valve, especially when the downstream piping system

isn't pressurized. If the outlet (downstream) pressure

exceeds the desired pressure, close the 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. NOTE: The needle

valve (39) is shipped in a full open position. If the system

is unstable due to pressure fluctuations, slowly close

the needle valve (39) until the system becomes stable.

This needle valve (39) should never be in a fully closed

position.

9. Develop system flow to a level near its expected normal

rate, and reset the regulator setpoint by turning the

adjusting screw CW (viewed from above) to increase

outlet pressure, or CCW to reduce outlet pressure.

10. Reduce system flow to a minimum level and observe

setpoint. Outlet pressure will rise from the setpoint

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

pressure should not exceed 44 psig (3 Barg). If it does,

consult factory.

SECTION V

Do not walk away and leave a bypassed regulator

unattended!

If the regulator and system are to both be shutdown,

slowly close the inlet (upstream) block valve. Close the

outlet (downstream) valve only if regulator removal is

required.

CAUTION C

CAUTION D

IOM-8310HP/LP-BASIC