Valve leakage causes and solutions

When in use when the valve leakage to do? What is the main reason?

First, the closure of the leakage produced by falling off
Reason.

1, poor operation, so that the closure of the parts stuck or more than the upper dead center, the connection is damaged and fractured.

2, the closure of the connection is not solid, loose strength and fall off; 3, the selection of the connection material is not right; 4, the closure of the connection material is not right.

Maintenance methods:

1, the correct operation, close the valve can not be too much force, open the valve can not exceed the upper dead center, the valve is fully open, the handwheel should be inverted a little;.

2.The connection between the closing part and the valve stem should be firm, and there should be a stopper at the threaded connection; 3、The connection between the closing part and the valve stem should be firm.

Second, the packing leakage (valve leakage, packing accounted for the largest proportion)

Causes:

1. filler selection is not right, not resistant to corrosion of the medium, not resistant to high pressure or vacuum valve, high or low temperature use;

2. Packing more than the use of the period, has been aging, loss of elasticity

3. Valve stem precision is not high, there is bending, corrosion, wear and other defects

Maintenance method:

1. The material and type of packing should be selected according to the working conditions.

2. According to the relevant provisions of the correct installation of packing, packing should be placed ring by ring compression, joints should be 30 ℃ or 45 ℃.

Third, the leakage of the sealing surface

Causes:

1, the sealing surface grinding is not flat, can not form a close line;.

2, the valve stem and the connection between the closing parts of the top center of the suspension, incorrect or wear.

Maintenance method:

1, according to the working conditions of the correct selection of the material and type of gasket.

2、Adjust carefully and operate smoothly.

Fourth, the leakage of sealing ring linkage

Causes:

1, the sealing ring rolling pressure is not tight

2, sealing ring and the body welding, surfacing quality is poor.

Maintenance methods:

1, sealing the leakage of rolling should be injected into the adhesive and then rolling fixed.

2, the sealing ring should be according to the welding specification to re not solve the filler welding. Surfacing can not be welded when the original surfacing and processing should be removed.

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