In addition to checking the surface of the electric ball valve, it is also necessary to carefully check the inside of the valve, remove the protective covers on both sides of the valve, and then check the cleanliness of the inside of the valve body, focusing on whether the inside of the valve is clean. If a large amount of dust is found, it is necessary to thoroughly clean the valve cavity, Since the closed surface of the pneumatic pipeline ball valve is spherical, once there are sundries, it will cause great damage to the closed surface of the valve, which we do not want to happen. Many operators have ignored this, and started to start the valve without cleaning up the impurities. As a result, a large number of scratches and scratches occurred before it was used for a long time, leading to the valve can not be used normally.

2. The valves shall be tested as follows before delivery:
① When the valve is open, the valve body shall accept the internal pressure test of twice the working pressure value of the valve;
② When the valve is closed, both sides separately accept 1.1 times of the valve working pressure value, without leakage; However, for metal sealed butterfly valves, the leakage value is not greater than the relevant requirements.