Pressure test method of gate valve

The strength test of gate valve is the same as that of globe valve. There are two methods for sealing test of gate valve.

① The ram is opened to raise the pressure in the valve to the specified value; Then close the gate valve, take out the gate valve immediately, check whether there is leakage at the sealing places on both sides of the gate valve, or directly inject the test medium into the plug on the valve cover to the specified value, and check the sealing places on both sides of the gate valve. The above method is called intermediate pressure test. This method is not suitable for sealing test of gate valve with nominal diameter less than dn32mm.

② Another method is to open the gate to increase the test pressure of the valve to the specified value; Then close the ram and open the blind plate at one end to check whether the sealing surface is leaking. Then turn over and repeat the test until it is qualified.

The airtightness test of packing and gasket of pneumatic gate valve shall be conducted before the airtightness test of gate valve.

DSC_0047


Post time: Apr-26-2021

Send your message to us:

Write your message here and send it to us
WhatsApp Online Chat !