Armstrong-Yoshitake, Inc. GD-30S Інструкції з монтажу та обслуговування - Сторінка 2
Переглянути онлайн або завантажити pdf Інструкції з монтажу та обслуговування для Блок управління Armstrong-Yoshitake, Inc. GD-30S. Armstrong-Yoshitake, Inc. GD-30S 4 сторінки. Pressure reducing valve
Друкувати сторінкуImproper adjustment of the pressure reducing valve may cause hunting, scale problems, water hammer, etc., and
damage to the valve itself. Damaged pressure gauges, leakage or opening of a bypass valve, or clogging of an inlet
strainer may cause problems similar to that of a malfunctioning reducing valve.
Adjust the valve as follows:
1. Close the gate valves before and after the pressure
reducing valve. Open the globe valve slowly in the
bypass line and blow down the inlet piping. Adjust the
opening of the bypass valve so the safety valve does
not blow. After blowing the system down, close the
bypass valve.
2. Slowly open the inlet side gate valve to the fully open
position, and partially open the outlet valve so only a
small amount of steam or air can pass.
Problem
The inlet pressure is too low or high.
The sensing port of the outlet pressure is clogged with
foreign matter.
The desired pressure
The valve size is smaller than what is required.
cannot be obtained.
The adjustment is not appropriate.
The inlet strainer is clogged by foreign substance.
The pressure gauge is not functioning properly.
The outlet pressure
The valve or valve seat is contaminated by foreign
substance.
rises higher than the
specified pressure
The by-pass valve is leaking.
The reducing ratio is excessively large.
Abnormal noise is
Water hammer (for steam service).
heard.
There is a fast closing valve near the PRV.
Start-Up and Adjustment Procedures
Troubleshooting Guide
Causes
3. To increase the downstream pressure, place your hand
on the top of the adjusting handle and pull vertically
up. When in the fully up position turn the handle
clockwise until the desired pressure is obtained on the
downstream pressure gauge.
4. Release the handle and it will automatically retract
which will lock the adjusting handle in place.
5. Slowly open the outlet valve to the fully open position.
Change the pressure to the appropriate level.
Disassemble and clean the sensing port.
Change the valve size to the appropriate one.
Readjust according to the adjustment procedure.
(See start-up procedure)
Disassemble and clean the strainer.
Replace the pressure gauge.
Disassemble and clean the valve or the seat.
Repair or replace the by-pass valve.
Reduce pressure by staging with second PRV.
Install a steam trap at the reducing valve inlet.
Provide as long a distance as possible between
the two valves.
2
Solutions