Correct selection of pressure reducing valve and precautions - Database & Sql Blog Articles

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Pressure reducing valves are used in a wide range of applications, including Yanqi, compressed air, industrial gas, water, oil and other liquid media. Therefore, given the many possible structural changes, the most important one is when considering the use of pressure reducing valves. It is the exact performance of the valve. First of all, the test should be fully carried out to ensure good use.

Selection principle

1. The fluctuation of the inlet pressure of the pressure reducing valve should be controlled at 80%-105% of the inlet pressure. If it exceeds this range, the performance of the pressure reducing valve will be affected.
2. Generally, the post-valve pressure Pc of the pressure reducing valve should be less than 0.5 times the pressure before the valve, that is, Pc < 0.5P1. Each spring of the pressure reducing valve is only applicable within a certain range of outlet pressure, and the spring should be replaced beyond the range.
3. In the case where the working temperature of the medium is relatively high, a pilot-operated piston type pressure reducing valve or a pilot type bellows pressure reducing valve is generally selected.
4. When the medium is air or water or liquid, it is generally preferred to use a direct acting membrane type pressure reducing valve or a pilot type diaphragm type pressure reducing valve.
5. When the medium is steam, the pilot piston type pressure reducing valve or the pilot bellows type pressure reducing valve should be used.
6. For the convenience of operation, adjustment and maintenance, the pressure reducing valve should generally be installed on a horizontal pipe.

Selection considerations

1. Within the given range of spring pressure levels, the outlet pressure should be continuously adjustable between the maximum and minimum values, with no jamming or abnormal vibration.
2. When the outlet flow changes, the direct pressure deviation of the outlet pressure is not more than 20%, and the pilot type is not more than 10%.
3. For soft-sealed pressure reducing valves, there shall be no leakage within the specified time. For metal-tight pressure reducing valves, the leakage shall not exceed 0.5% of the maximum flow.
4. When the inlet pressure changes, the direct action of the outlet pressure deviation value is not more than 10%; the pilot type is not more than 5%.
5. For the pressure reducing valve that is not used, adjust the spring to be in a free state. The inlet and outlet ends are closed with a plug.
6. The flow rate of the pressure reducing valve is related to the nature of the fluid and the pressure ratio. The smaller the pressure ratio, the larger the flow rate; but when the pressure ratio is reduced to a certain value, the flow rate no longer increases as the pressure ratio decreases.