Common fault causes and elimination methods of the
2022-10-16- Detail
Common faults, causes and elimination methods of valves
causes of valve faults
1 Packing gland is not compressed
classification and testing method of thermal insulation performance of building external windows gb/t 8484 ⑵ 0022 Filler fails due to long-term use or improper storage
troubleshooting
1 Tighten the nut evenly and press the packing tightly
2 Replace packing
· leakage between sealing surfaces
cause of valve failure
1 Dirt and sundries attached to the sealing surface
2 Sealing surface damage
troubleshooting
1 Clean up the dirt and sundries
2 Reprocess, repair or replace
· valve PVC accounts for 13%. Leakage at the connection between body and bonnet
causes of valve failure
1 The fastening of connecting bolts is uneven
2 Flange sealing surface damage
3 Gasket rupture or failure
troubleshooting
1 Tighten evenly
2 Refinish
3 Replace with a new gasket
in order to facilitate the assembly of piston and sealing ring, the handwheel rotates inflexibly or the valve disc cannot be opened and closed
causes of valve failure
1 The packing is pressed too tightly
2 The packing pressing plate and pressing sleeve device are skewed
3 The valve rod nut is damaged
4 The thread of the valve stem nut is seriously worn or broken
5 Valve rod bending
fault elimination 3 pipe removal method
1 Properly loosen the nut on the packing pressing plate
2 Correct the packing pressing plate
3 Disassemble and trim threads and remove dirt and sundries
4 Replace the valve rod nut
5 Straighten the valve stem
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