Method Of Static Pressure Life Test Procedure For Sanitary Diaphragm Valves

The following is the method of the Sanitary Diaphragm Valve static pressure life test procedure:

1. The operating torque of the test, except for the sanitary diaphragm valve with flat seal, is based on the rated opening and closing operating torque measured by manual operation when the sealing performance can be maintained during the sealing test. The torque of manual operation shall not exceed the torque that can be generated by the driving handwheel equipped with the one-person gate valve or the operating torque specified in the product standard. The operating torque of the flat gate valve with flat seal is based on the operating torque when opening with pressure, and the test operating torque repetition deviation of the driving mechanism should be less than 5%.

2. During the static pressure life test, the sealing performance and operating torque should be checked every 200-300 opening and closing cycles according to the characteristics of the sealing pair matching materials. After the sealing performance is qualified, continue the test; for manually operated gate valves, if the operating torque changes, it can be adjusted, and gate valves operated by other operating mechanisms cannot be adjusted.

3. If the sanitary diaphragm valve has installation and flow direction requirements, it should be installed according to the required installation and flow direction.
4. The number of static pressure life tests should be recorded using an electromagnetic counter based on the signal provided by the travel switch driven by the life testing machine or electric, hydraulic, pneumatic or other electro-hydraulic and pneumatic linkage devices.