Causes and Treatment of Valve Body Leakage of Blank Plate Valve


Causes of valve body leakage of vacuum flapper valve and its treatment
1. The valve body has sand holes or cracks;
2. Crack during repair welding of valve body

Handle:
1. Polish the suspected crack and etch it with 4% nitric acid solution, if there is crack, it can be shown;
2. Repair the cracks.
Reasons for damage of valve rod and its matching screw thread, broken stem head and bent stem:
1. Improper operation, excessive switch force, failure of limit device and failure of over torque protection. ;
2. The thread fit is too loose or too tight;
3. Too many operations and too long service life
Handle:
1. Improve the operation, do not use too much force; check the limit device, check the over torque protection device;
2. Select appropriate materials, and the assembly tolerance meets the requirements;
3. Replacement of spare parts

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