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Primary Pressure Regulating Valve

Questions

Q Which size of mesh is recommended for the strainer applied to a primary pressure regulating valve to prevent foreign substances?
Q What is the difference between a primary pressure regulating valve and a differential pressure regulating valve?
Q Is it abnormal that water leaks out from the adjusting screw part when adjusting GD-21?
Q How should we select pressure sustaning valves?

QWhich size of mesh is recommended for the strainer applied to a primary pressure regulating valve to prevent foreign substances?

60 to 80mesh is recommended for liquid or gas application.

QWhat is the difference between a primary pressure regulating valve and a differential pressure regulating valve?

"Primary pressure regulating valve" is installed as a relief valve for the pump in the air conditioning facilities for high-rise buildings adopting the open circuit method. "Differential pressure regulating valve" is installed in the facilities adopting the close circuit method, where a pump needs to run at the stable flow rate regardless of the back pressure. GD-20R primary pressure regulating valve and GD-21 differential pressure regulating valve are the major products in our product lineup.

QIs it abnormal that water leaks out from the adjusting screw part when adjusting GD-21?

It is designed to seal the water by the gasket on the cap, so water leak from the screw at the time of adjustment is not abnormal.

QHow should we select pressure sustaning valves?

Refer to "Pressure Sustaining Valve Sizing Check."

Link：　 Digital Catalog Waterfall prevention valve sizing check　

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