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Possible faults, causes and elimination methods of knife gate valve:
possible failures | Cause of failure | Elimination method |
Packing leakage | 1. The packing gland is not pressed tightly 2. The filler fails due to long-term use or improper storage | 1. Tighten the nut evenly to compress the packing 2. Replace the packing |
Leakage between sealing surfaces | 1. There is dirt and debris attached to the sealing surface 2. Damaged sealing surface | 1. Clean the dirt and sundries 2. Rework, trim or replace |
Leakage at the connection between the valve body and the bonnet | 1. Uneven tightening of connecting bolts 2. The flange sealing surface is damaged | 1. Tighten evenly 2. Refinish |
The handwheel is inflexible or the gate cannot be opened and closed | 1. The packing is pressed too tightly 2. The stem nut is damaged 3. The thread of the stem nut is severely worn or broken 4. Stem bending | 1. Properly loosen the nut on the packing pressure plate 2. Disassemble and trim threads and remove dirt and debris 3. Replace the stem nut 4. Correct the valve stem |
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Address: Wuxing Industrial Zone, Oubei Town, Yongjia County, Wenzhou City, Zhejiang Province, China
E-mail: 412305565@qq.com