Pressure reducing valve for water

I would like to perform a pressure resistance (airtightness) test on the secondary side piping of the water supply pressure reducing valve. How much pressure can be applied?

Basically, in the case of a pressure reducing valve assembly, the maximum pressure is 1.2 times the secondary set pressure. (From SHASE S106) The main body has sufficient pressure resistance, but when pressure is applied from the secondary side of the pressure reducing valve, the pressure on the diaphragm presses the valve body (disk), causing the disk to deform, leading to problems such as valve leakage and noise generation.

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