[Process Engineering Division – Pipeline and Valve Technology Exchange Forum – Daily Question – Questions 03-08]
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【Process Engineering Division – Pipeline and Valve Technology Exchange Forum – Daily Question – Questions 03–08】 What are the common causes of leakage at the valve cover joint? For reference only: (1) Insufficient screw tension; (2) Misalignment during tightening; (3) Poor quality of gaskets and uneven joint surfaces.
1. Insufficient or excessive bolt tension； 2. Damaged valve cover gasket ； 3. The joint surface is uneven
1. Insufficient screw tension 2. Misaligned tightening 3. Poor quality of the shims and uneven mating surfaces
Insufficient bolt tightening force, uneven tightening, poor quality of gaskets, etc
Loose compression bolts, damaged gaskets, corroded contact surfaces
1. Insufficient bolt tension or improper tightening. 2. Gaskets that do not meet requirements or damaged gaskets. 3. Defects in the mating surfaces
The screw tension is insufficient； Tight bias ； The pad has poor quality and an uneven joint surface.