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  1. PPHHWW

    Double offest High Performance Butterfly Valves High Pressure Closure Test Problem

    Dear Danlap: Thank you for your reply. Allow me to clarify the basic specification of the "Double Offset High Performance Butterfly Valves" which we are developing. The valves use resilient (RPTFE) seats. Sizes range from 2" to 12". The rating pressure is Class 150, equals to 285 psig. The...
  2. PPHHWW

    Double offest High Performance Butterfly Valves High Pressure Closure Test Problem

    Dear bcd: Thank you for your reply. You are correct. The problem I am facing is that the test pressure helps open the disc when the pressure comes from the side of the seat retaining plate. Apparently, the overall friction are insufficient to hold the valve closed for high pressure test. We...
  3. PPHHWW

    Double offest High Performance Butterfly Valves High Pressure Closure Test Problem

    Dear Danlap: Thank you for your valuable answers. If the valve can be tested as it equipped with a handle and notch plate, that will create another difficulties to us. This practice might be able to be conducted during the stage of the development, however it would become impractical to do if...
  4. PPHHWW

    Double offest High Performance Butterfly Valves High Pressure Closure Test Problem

    Dear Professions My company is developing the series of Double offset High Performance Butterfly Valves High Pressure. Now we have problems regarding the high pressure closure test. Our product design is to API-609. So, we follow the API 598 to conduct the pressure testings. When we do the high...
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