Gate valve pressure test strength test method and cut-off valve. Tightness test valve in two ways. ① gate open, the valve within the pressure was raised to a predetermined value; then close the gate, immediately remove the gate, Zhuhai valves, check whether there is leakage at the gate seals on both sides, or directly to the valve plug cap injection test medium to a predetermined value, check the gate on both sides of the seal. The above method is called intermediate pressure test. This method should not be in the nominal diameter of the valve DN32mm do the following seal test. ② Another method is to open the gate, so that the valve test pressure was raised to a predetermined value; then closing plate, open end of the blind, Shanghai Guanlong valve Machinery Co., check the sealing surface for leaks. And then fell down, Guangzhou Kaiheng Valve Co., Ltd., for more than repeat the test to pass up. Pneumatic valve packing and gasket sealing at the test should be carried out before the gate sealing tests. Pilot type and direct acting solenoid valve solenoid valve response time from fully closed to fully open (or vice versa) reaction time depends on the nominal diameter, action, the starting current and power, and the viscosity of the fluid medium category, and the inlet pressure valve Working pressure and so on. For Path DN≤50, Shanghai and Shanghai Valve Manufacturing Co., Ltd., the fluid medium is a gas, the pressure P≤1Mpa: general direct acting solenoid valve reaction time is 15-60ms, pilot solenoid valve reaction time 20-250ms, Recoil electromagnetic reaction tends to be close to direct-acting solenoid valve. When using a liquid medium, the solenoid valve response time than the above value by approximately 50-100%. DC solenoid valve response time than the above value by about 50%. As a result of changes in parameters of the test solenoid valve response time more, generally can not provide a reaction time of each valve, according to user needs to provide the required test conditions. Tianjin Tanggu Valve Co., Ltd., the Hong Kong _ _ Zhuhai valve valve valve provided by the Hong Kong Science and Technology Co., Ltd., Dongguan Ming. Valve Co., Ltd., Dongguan Ming Kong (www.gdmgfm.com) strong, credible, butterfly and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead valve and you work out of Hong Kong into the brilliant, for a better future!