High pressure pneumatic control valve for static pressure life test need to prepare what

High pressure pneumatic control valve for static pressure what life test need to prepare 1) Need a static life test of high pressure pneumatic - valve sealing performance should be consistent with GB/T 13927 or GB/T 9092. 2) High pressure pneumatic - valve life test of static pressure test system principle diagram as shown in figure 4 1. 3) Test medium for the normal temperature water. If need to use air as the test medium, should according to the rating of the valve opening differential pressure of pressure difference control trial. 4) Regardless of what kind of way of operation, high pressure pneumatic - valve used for static pressure life test, it wears the operation of the device test shall be carried out with the valve opening and closing cycle. The handwheel direct drive or driven by worm gear deceleration device manual gate valves, application life testing machine to test the driving mechanism drives the gate valve of the handwheel or worm gear retarding mechanism handwheel; By the electric, hydraulic, pneumatic, or other electric liquid gas valve for gear drive, the application of the matching operation drive device drives the gate valve opening and closing cycle experiment was carried out. 5) Life test, static pressure from seated keep seal position, as the starting point of the valve opening should reach more than 90% of the actual opening. 6) Life test, static pressure from the open position to the closed, the process of body cavity should be full of medium with pressure, medium pressure is 90 degrees? 100 degrees of the valve nominal pressure or highest design pressure; Arrived at the closed position, the export side of the gate valves should be medium pressure release. The differential pressure diaphragm valve in the test medium conditions of factory began to rev. When required by the gate valves are rated pressure difference, the test shall be made in the rated pressure difference when test pressure difference. 7) Test, in addition to the plane sealing flat gate valve, shutoff gate valves should be in operation torque, flat sealed flat gate valve to control the close valve closed position. 8) Test the operation of the moment, in addition to the plane sealing plate gate valve, to seal test, can keep the sealing performance, under the condition of manual measurement to get the biggest opening and closing operation torque, moment of manual operation shall not be more than one person with gate valves are installed with driving wheel torque or products from standard operating torque. Flat gate valve, operating torque of planar seal shall prevail to bring pressure on the operation of the torque, driving mechanism of repeated deviation should be less than 5% soil experiment operating torque. 9) Static pressure in the process of the life test, should according to the characteristics of sealing pair matching material, every opening and closing cycle of 200? 300 times, a sealing performance and operating torque. Qualified seal performance, continue to the test; Manual operation of the gate, if the operating torque change can be adjusted, operated by other matching operator of gate valve, can not be adjusted. 10) If high pressure pneumatic control valve is installed and flow requirements, should with the installation and flow requirements. 11) The record, the number of static pressure life test should pass or electric life testing machine, hydraulic, pneumatic, or other electric hydraulic pneumatic linkage drive provided by the stroke switch signal, using electromagnetic counter records.