Here is some info about the disadvantages, common faults and maintenance of gate valves.
1. Disadvantages of gate valves
Erosion and abrasion are easily caused between sealing surfaces of a gate valve, and the maintenance is difficult. It has a large size, which requries a certain space to be opened and closed, and it has a long opening and closing time. Besides, the structure is complex.
2. Packing leakage and treatment methods of gate valves
If the packing is aged and causes leakage, the aged packing shall be replaced one by one with the joint angle of 300-400. If the packing gland is not tightened and the leakage is caused, the bolts of the packing gland shall be tightened evenly and diagonally.
3. Leakage and treatment of sealing surfaces of gate valve seats
If the valve is not closed in place, the plate and the sealing surface of gate valve seats can not be completely sealed. Turn the hand wheel to close it in place. If the sealing surface of gate valve seats is scratched, close the valve and add special grease for sealing.
4. Maintenance of gate valves
1. Disadvantages of gate valves
Erosion and abrasion are easily caused between sealing surfaces of a gate valve, and the maintenance is difficult. It has a large size, which requries a certain space to be opened and closed, and it has a long opening and closing time. Besides, the structure is complex.
2. Packing leakage and treatment methods of gate valves
If the packing is aged and causes leakage, the aged packing shall be replaced one by one with the joint angle of 300-400. If the packing gland is not tightened and the leakage is caused, the bolts of the packing gland shall be tightened evenly and diagonally.
3. Leakage and treatment of sealing surfaces of gate valve seats
If the valve is not closed in place, the plate and the sealing surface of gate valve seats can not be completely sealed. Turn the hand wheel to close it in place. If the sealing surface of gate valve seats is scratched, close the valve and add special grease for sealing.
4. Maintenance of gate valves
- Keep the gate valve clean and free of rust, oil and gas leakage.
- Control the working pressure of the gate valve under the design pressure.
- The valve stem and other parts of gate valves should be regularly filled with lubricating oil according to whether the valve can be opened normally.
- The gate valve shall be fully opened and closed at least once every two months to ensure the normal operation of the gate valve. The problems occurred during the operation shall be handled in time to ensure that the valve is in a controllable state. If the process needs to be switched or the gas transmission is affected, it shall be reported to the control center in advance.
- Before entering winter every year, check the lubrication of the exposed valve stem thread; remove the old grease and apply new grease. For the valve stem with protective sleeves, grease should be injected from the oil nozzle regularly.
- Lubrication maintenance of gate valves is a necessary method to prolong the life of gate valves.
- It plays an important role in the process operation, and the key valve should be filled with grease in September and October every year.
- After the valve grease is injected, open and close the valve 2 to 3 times to make the grease evenly spread on the plate.
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