Causes of internal leakage of the valve during the construction period

① Improper transportation and hoisting cause overall damage to the valve and cause internal leakage of the valve;
② When leaving the factory, the valve was not dried and anti-corrosion treated after pumping the water pressure, resulting in corrosion of the sealing surface and internal leakage;
③ The construction site protection is not in place, and blind plates are not installed at both ends of the valve, rainwater, sand and other impurities enter the valve seat, causing leakage;
④ During installation, no grease was injected into the valve seat, causing impurities to enter the back of the valve seat, or internal leakage caused by burns during welding;
⑤The valve is not installed in the fully open position, causing damage to the ball. During welding, if the valve is not in the fully open position, welding spatter will cause damage to the ball. When the ball with welding spatter is on and off, it will further cause damage to the valve seat. , resulting in internal leakage;
⑥Scratches on the sealing surface caused by construction residues such as welding slag;
⑦ Leakage is caused by inaccurate limit position during delivery or installation. If the assembly angle of the valve stem drive sleeve or other accessories is misaligned, the valve will leak.