13

2020

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05

Gate valve pressure test method

Author:


The strength test of gate valves is the same as that of stop valves. There are two methods for gate valve sealing test.   ① Open the gate to raise the pressure in the valve to the specified value; then close the gate, take out the gate valve immediately, check whether there is leakage at the seals on both sides of the gate or directly inject the test medium into the plug on the valve cover to the specified value , check the seals on both sides of the gate. The above method is called intermediate pressure test. This method is not suitable for sealing tests on gate valves with nominal diameters below DN32mm.   ② Another method is to open the gate to increase the valve test pressure to the specified value; then close the gate, open the blind plate at one end, and check whether the sealing surface is leaking. Turn the head back again and repeat the above test until it passes the test.   The sealing test of the pneumatic gate valve packing and gasket should be carried out before the gate sealing test.

       The strength test of gate valves is the same as that of stop valves. There are two methods for gate valve sealing test.
  ① Open the gate to raise the pressure in the valve to the specified value; then close the gate, take out the gate valve immediately, check whether there is leakage at the seals on both sides of the gate or directly inject the test medium into the plug on the valve cover to the specified value , check the seals on both sides of the gate. The above method is called intermediate pressure test. This method is not suitable for sealing tests on gate valves with nominal diameters below DN32mm.
  ② Another method is to open the gate to increase the valve test pressure to the specified value; then close the gate, open the blind plate at one end, and check whether the sealing surface is leaking. Turn the head back again and repeat the above test until it passes the test.
  The sealing test of the pneumatic gate valve packing and gasket should be carried out before the gate sealing test.