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

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Pressure reducing valves are widely used in various applications such as pneumatic systems, compressed air, industrial gases, water, oil, and other liquid media. Due to the numerous possible design variations, the most critical factor when selecting a pressure reducing valve is its performance characteristics. It's essential to conduct thorough testing to ensure reliable operation and long-term stability.

Selection Principles

1. The inlet pressure fluctuation should be kept within 80% to 105% of the nominal inlet pressure. Exceeding this range may lead to unstable performance or reduced lifespan of the valve.

2. The outlet pressure (Pc) after the valve should generally be less than half of the inlet pressure (P1), i.e., Pc < 0.5P1. Each spring is designed for a specific outlet pressure range, and it’s important to replace the spring if the operating conditions exceed that range.

3. When dealing with high-temperature media, a pilot-operated piston-type or bellows-type pressure reducing valve is typically recommended to handle thermal expansion and maintain stability.

4. For air, water, or liquid media, direct-acting diaphragm-type or pilot-operated diaphragm-type valves are commonly preferred due to their simplicity and efficiency.

5. In steam applications, pilot piston-type or bellows-type valves are more suitable to manage high temperatures and prevent condensation issues.

6. To ensure ease of operation, adjustment, and maintenance, it is generally advised to install the pressure reducing valve on a horizontal pipe line.

Selection Considerations

1. Within the specified spring pressure range, the outlet pressure should be continuously adjustable between the maximum and minimum values without any sticking or abnormal vibrations.

2. When the flow rate changes, the deviation in outlet pressure should not exceed 20% for direct-acting valves and 10% for pilot-operated valves.

3. Soft-sealed pressure reducing valves must not leak within the specified time frame. For metal-sealed valves, the leakage should not exceed 0.5% of the maximum flow rate.

4. If the inlet pressure fluctuates, the outlet pressure deviation should not exceed 10% for direct-acting valves and 5% for pilot-operated ones.

5. When the valve is not in use, the spring should be set to a free state, and both the inlet and outlet ports should be sealed with caps to prevent contamination or damage.

6. The flow capacity of the valve depends on the fluid type and the pressure ratio. A lower pressure ratio usually allows for a higher flow rate, but once the pressure ratio drops below a certain threshold, further reductions will not significantly increase the flow.