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Several common gas butterfly valve leakage and daily maintenance


Henan Valve Co., Ltd. is a major manufacturer of valves, the following gas butterfly valve daily maintenance and several common leaks to introduce.

Gas butterfly valve daily maintenance

1, the valve storage environment should pay attention to, should be stored in a dry and ventilated room, and block the passage at both ends.

2, the valve should be checked regularly, and remove the dirt on it, apply anti-rust oil on its surface.

3. After installation and application of the valve, it should be regularly overhauled to ensure its normal operation.

4. Check whether the valve sealing surface is worn, and repair or replace it according to the situation.

5, check the valve stem and stem nut trapezoidal thread wear, packing is outdated failure, etc., and the necessary replacement.

6. The sealing performance of the valve should be tested to ensure its performance.

7. The valve in operation should be in good condition, the bolts on the flange and bracket are complete, the threads are undamaged, and there is no looseness.

8. If the handwheel is lost, it should be equipped in time, and it cannot be replaced by a live wrench.

9. The packing gland is not allowed to skew or have no pre-tightening gap.

10. If the valve is used in a harsh environment and is susceptible to rain, snow, dust, sand and other dirt, a protective cover should be installed for the valve stem. 11, the scale on the valve should be kept complete, accurate and clear, the valve seal, cap.

12. The thermal insulation jacket shall be free of sag and crack.

13, the operation of the valve, to avoid its knock, or support heavy objects, etc.

Leakage of sealing surface:

1. Correctly select the material and type of the top gasket according to the working conditions;

2, carefully adjusted, smooth operation;

3. The bolts should be screwed evenly and symmetrically, and a torque wrench should be used if necessary. The pre-tightening force should meet the requirements and should not be too large or small. There shall be a certain pre-tightening clearance between flange and screw connection;

4. Gasket assembly should be aligned and evenly stressed. Overlapping and double gaskets are not allowed for gaskets;

5, static sealing surface corrosion, damage processing, processing quality is not high, should be repaired, grinding, coloring inspection, so that the static sealing surface meets the relevant requirements;

6. When installing the gasket, pay attention to cleaning. The sealing surface should be cleaned with kerosene, and the gasket should not fall to the ground.

Leakage at the 4. seal ring joint

1. The sealing ring shall be repaired and welded again according to the welding specification. The original surfacing and processing shall be removed when the surfacing cannot be repaired;

2. Remove the screws and pressing ring for cleaning, replace the damaged parts, grind the sealing surface of the seal and the connecting seat, and reassemble. For parts with large corrosion damage, welding, bonding and other methods can be used to repair;

3. The connecting surface of the sealing ring needs to be disassembled to check whether the sealing surface is worn or not. Whether there is foreign matter blocking? Remove foreign matter and polish the sealing surface to solve the leakage. The sealing ring shall be replaced when it cannot be repaired.

5. body and bonnet leaks:

1. Improve the quality of casting, and conduct strength tests in strict accordance with regulations before installation;

2. The welding seam of the valve body and the valve cover composed of welding shall be carried out according to the relevant welding operation procedures, and the flaw detection and strength shall be carried out after welding.

3. It is forbidden to push and put heavy objects on the valve, and it is not allowed to hit cast iron and non-metallic valves with hand hammer. The installation of large-diameter valves should have brackets.

The gas butterfly valve produced by the upper valve is divided into electro-hydraulic metal hard seal butterfly valve, wafer type hard seal butterfly valve, electric hard seal butterfly valve, pneumatic butterfly valve, manual butterfly valve, etc.

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