Valve Maintenance Knowledge

How to maintain valve instructions

一, Leakage at the sealing packing
Analyze Production Reason:
1. Packing aging;  

2. Excessive force during operation;  

3. Packing gland bolt is loose;

Fault Elimination Method:  

1. The aging and damaged sealing packing should be replaced in time, and the joints should be placed one turn at a time, and the joints should be 30° ~ 45°;  

2. The operation should be uniform with normal force, and no bushing or other methods should be used to lengthen the moment arm;  

3. Tighten the bolt holding the packing gland evenly;
二, Sealing Face Leakage
Reasons for production:  

1. The valve installation direction does not conform to the medium flow direction;  

2. The valve is not closed in place;  

3. Scaling on the sealing surface of the long-closed valve;  

4. The sealing surface is slightly rubbed;  

5. The sealing surface is seriously damaged;
Fault Elimination Method:  

1. Pay attention to valve installation inspection;  

2. Readjust the high-speed screw on the actuator and close it firmly in place;  

3. Open the valve a seam to allow high-speed liquid to wash away the scale;  

4. High-speed gasket for compensation;  

5. Regrinding, high-speed gasket compensation;
三, External Leakage Of Flange Connection  

Reasons for production:
1. Uneven tightening force of stud;  

2. Gasket aging damage;  

3.The material of gasket is not consistent with the requirements of the working medium
Fault Elimination Method:
1. Re-tighten the bolts evenly;  

2. Replace the gasket;  

3. Correctly select gasket materials and forms according to the requirements of working conditions. If necessary, please contact the manufacturer for help in material selection and selection.   

四, Lever, Hand wheel are damaged
Reasons for production:
1. Incorrect use;  

2. Fastener loose;  

3. The Lever, hand wheel and valve stem are damaged
 Fault Elimination Method:
1. Do not use pipe pliers, extended levers, impact tools, etc.;  

2. Repair the matching at any time;  

3. Repair at any time;
五, Worm Gear, worm stem card bite
Reasons for production:
1. Embedded in dirt, affecting lubrication;

2. The operation is incorrect.
 Fault Elimination Method:
1. Remove dirt, keep it clean, and add oil regularly;  

2. If the operation is found to be stuck, torque is very large, can not continue to operate, immediately stop, thoroughly check;
六, Electric Valve Installation Failure
Reasons for production:
1. Poor lubrication, foreign bodies in the valve are stuck, resulting in large damage to the torque edge;  

2. Motor fault;

Fault Elimination Method:
1. Add oil to make the tubing good, the packing pressing should be adapted, and the foreign matter in the valve should be removed in time to keep clean;  

2. The working time of the motor shall not exceed 15 minutes. The power supply shall be normal to avoid the motor being affected by moisture.