Fire control pneumatic ball valve opening and closing force

opening and closing force test. Fire ball in the opening and closing force, the standards should be precise dynamometer using or with force measuring devices other tests at the same level. 。 Open/close force test should be the handwheel or handle along the tangent direction. 。 The handwheel and processing point should be respectively in the figure, figure shows the location of the layout. In dealing with the ball, the ball head center point load. 。 Test in front of the fire ball pneumatic valve operation can be fully open before all closed down. 。 Test pressure shall ensure that before the open fire or fire value pneumatic valve closed. Pressure testing testing requirements ( ） Test medium for water, the temperature should be between? ℃. ( ） In the process of the test should not be a fireball external strength test results. ( ） Test pressure shall be gradually increase to test pressure, test duration, to keep the pressure constant. ( ） Fire test, pneumatic valve body cavity should be excluded from the air. ( ） Indicators of not less than the detection precision of the pressure gauge and pressure, and the measurement range. Times the test pressure. ( ） Casing pressure test in front of the fire control pneumatic valve surface should be coated with paint or surface coating is covered with other possible defects. Fireball inventory has been applied to test the pressure of allowed to retain the shell coating time. ( ） Sealing test shall be carried out after the voltage test cases. ( ） Sealing test, sealing surface should be clean, no oil, to prevent scratches on sealing surface, can use coated with a layer of film thickness of not more than kerosene. Shell test pressure ball is partially open, close, from the other end of the end of the fireball coelomic cavity filled with water, the pressure to the test pressure and the shell ( Including filling and pneumatic valve and pneumatic valve bonnet joint) For inspection. Seal test medium for fire ball, open, closed fire from import to export the pneumatic valve body cavity filled with water, the pressure to the test pressure, shut down the ball, in the export side release part of the pressure on the ball, offer open outlet flow side, check the sealing performance. Fire did not provide the media flow pneumatic valve, the other end of the pressure in the same way also should check. Static life test of the fireball is prescribed by JB/Z axis static test of life.