Industrial valves-method of test pressure

Gate valve gate valve pressure test method for strength testing and stop valve. Valve tightness test, there are two methods. ① the gate open, the valve the pressure up to the specified value then close the gate, remove the valve and check whether gate seals on both sides are leaking or injected directly into the valve cover plug test media to the specified value, check both sides of the gate seals. Above is called the Middle pressure test. This method should not be below the nominal diameter DN32mm valve seal test. Secondly, another approach is to RAM open, make the valve test pressure up to the specified value then shut the gate, open end blind, check that the seal is leaking. Fell asleep again, and repeat above testing to quality.