How To Perform Routine Maintenance On The Liquid Cooling Butterfly Valve? It's No Big Deal After Reading This!

1. Leakage from the Butterfly Valve cooling Body and Bonnet:
Causes:
1. Poor casting quality, with defects such as pinholes, loose structure, and slag inclusions on the cooling Butterfly Valve body and bonnet.
2. Cold cracking.
3. Poor welding, with defects such as slag inclusions, unwelded parts, and stress cracks.
4. Damage to the cooling water Butterfly Valve after being struck by a heavy object.
Maintenance Methods:
1. Improve casting quality and strictly perform strength tests according to regulations before installation.
2. Butterfly Valve data center exposed to temperatures of 0°C or below should be insulated or heated, and cooling Butterfly Valve out of service should be drained of accumulated water.
3. Welds on the cooling water Butterfly Valve body and bonnet should be welded according to relevant welding procedures, and flaw detection and strength testing should be performed after welding.
4. Do not place heavy objects on the Butterfly Valve cooling. Do not strike cast iron or water cooling Butterfly Valves with hammers. cooling Butterfly Valve should be installed with brackets.
2. Leakage at the Packing (External leakage of the water cooling Butterfly Valve, with the packing accounting for a larger proportion)
Causes:
1. Improper packing selection: inability to withstand the corrosive media, high pressure or vacuum, or high or low temperature conditions of the cooling water Butterfly Valve.

2. Improper packing installation: defects such as replacing a larger packing with a smaller packing, poor spiral joints, or tighter packing at the top and looser packing at the bottom.

3. Packing that has exceeded its service life, aged, and lost its elasticity.

4. Butterfly Valve cooling system stem precision: defects such as bending, corrosion, and wear.

5. Insufficient packing turns, resulting in insufficient gland compression.

6. Damage to the gland, bolts, or other components, preventing the gland from tightening.

7. Improper operation, such as excessive force.

8. The gland is skewed, with the gap between the gland and the water cooling Butterfly Valve stem being too small or too large, causing wear on the valve stem and damage to the packing.

Maintenance Methods:

1. Select the packing material and type according to the operating conditions.

2. Install the packing correctly according to relevant regulations, placing and tightening the packing turn by turn. The joints should be at a 30° or 45° angle.

3. Expired, aged, or damaged packing should be promptly replaced.

4. Bent or worn valve stems should be straightened and repaired, and severely damaged ones should be replaced promptly.
5. Packing should be installed according to the specified number of turns. The gland should be tightened symmetrically and evenly, and the gland should have a preload clearance of at least 5mm.
6. Damaged glands, bolts, and other components should be repaired or replaced promptly.
7. Operating procedures should be followed. Except for the impact handwheel, operate with a constant speed and normal force.
8. Gland bolts should be tightened evenly and symmetrically. If the clearance between the gland and the valve stem is too small, increase it appropriately. If the clearance between the gland and the valve stem is too large, replace it. 3. Sealing Surface Leakage
Causes:
1. The sealing surface is unevenly ground, failing to form a seal line;
2. The center of the valve stem and the closure member is suspended, misaligned, or worn;
3. The valve stem is bent or improperly assembled, causing the closure member to be skewed or misaligned;
4. Improper sealing surface material quality or the valve is not selected according to the operating conditions.
Maintenance Methods:
1. Select the correct material and type of gasket based on the operating conditions;
2. Carefully adjust and operate smoothly;
3. Tighten the bolts evenly and symmetrically. Use a torque wrench if necessary. The preload force should meet the requirements and should not be too high or too low. Flanges and threaded connections should have a certain preload clearance.
4. Gaskets should be aligned and evenly loaded when assembled. Overlapping gaskets and the use of double gaskets are not permitted.
5. Static sealing surfaces that are corroded, damaged, or poorly finished should be repaired, polished, and color-checked to ensure they meet the relevant requirements.
6. Gaskets should be clean during installation. The sealing surfaces should be cleaned with kerosene, and gaskets should not fall to the ground.
IV. Leakage at the Sealing Ring Connection
Causes:
1. The sealing ring is not tightly rolled.
2. The sealing ring is welded to the body, and the weld overlay quality is poor.
3. The sealing ring connection threads, screws, or pressure ring are loose.
4. The sealing ring connection is corroded.
Maintenance Methods:
1. If the sealing rolled area leaks, apply adhesive and then roll it to fix it.
2. The sealing ring should be re-welded according to welding specifications. If repair welding is not possible, remove the original weld overlay and rework.
3. Remove the screws and pressure ring, clean them, replace the damaged parts, grind the seal and connector mating surfaces, and reassemble. For parts with extensive corrosion damage, welding, bonding, or other methods can be used for repair.
4. If the seal ring connection surface is corroded, repairs can be made by grinding, bonding, or other methods. If repair is not possible, the seal ring should be replaced.
5. Closure Parts Falling Off and Leaking:
Causes:
1. Improper operation, causing the closure part to become stuck or exceed top dead center, resulting in damage and fracture at the connection.
2. The closure part connection is not secure, loosening, and falling off.
3. The incorrect connector material cannot withstand the corrosive media and mechanical wear. Maintenance Instructions:
1. Operate correctly. Do not use excessive force to close the valve, do not open the valve beyond top dead center, and after the valve is fully opened, turn the handwheel slightly backward.
2. The connection between the closing member and the valve stem must be secure, and the threaded connection must have a retaining feature.
3. The fasteners connecting the closing member to the valve stem must withstand the corrosive effects of the medium and have sufficient mechanical strength and wear resistance.