Sealing surface leakage

cause
1. The sealing surface is unevenly ground and cannot form a tight line;
2. The top of the joint between the valve stem and the closing member is suspended, not worn or worn;
3, the valve stem is bent or improperly assembled, so that the closing member is skewed or not in the middle;
4. The quality of the sealing surface material is improperly selected or the valve is not selected according to working conditions.

Prevention and elimination methods
1. Correctly select the materials and types of the underlying gasket according to the working conditions;
2, carefully adjusted, smooth operation;
3. The bolt should be screwed evenly and symmetrically. If necessary, a torque wrench should be used. The pre-tightening force should meet the requirements and should not be too large or small. There should be a certain pre-tightening clearance between the flange and the threaded joint;
4, the gasket assembly should be aligned in the middle, the force is even, the gasket is not allowed to overlap and use double gasket;
5, static sealing surface corrosion, damage processing, processing quality is not high, should be repaired, polished, coloring inspection, so that the static sealing surface meets relevant requirements;
6. When installing the gasket, pay attention to cleaning. Apply kerosene to the sealing surface. The gasket should not fall to the ground.