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12
7.
Troubleshooting
Status
Possible Cause
Countermeasure
Gate Internal
Leakage
Operating pressure is too low
Increase pressure to 0.45MPa or more
Foreign materials on Seal surface
Cleaning the Seal Surface
Scratches on the seal surface of Gate
Replace Gate
Scratches on the seal surface of Body
Replace Body
Deterioration of O-ring by process exposure
Replace with new O-ring whose material
compatible with process environment
Twist of O-ring
Re-install O-ring
Come off of O-ring
Re-install O-ring
Peeling off of O-ring
Replace O-ring
Concave/Convex of end of O-ring
Place the convex part into the groove to
make O-ring height the same
Deterioration of Bonnet assembly
Replace Bonnet assembly
External Leakage
Damage of Bellow assembly
Replace Bellows assembly
Deterioration of O-ring by processing
Replace with new O-ring whose material
compatible with process environment
Scratches on the seal surface
Polish of seal surface
Gate is not CLOSING
End lock operation lock
Please refer to 4-4
Deterioration of Bonnet assembly
Increase pressure to 0.45MPa or more
Deterioration of Bonnet assembly
Replace Bonnet assembly
Gate is not OPENING
End lock operation lock
Please refer to 4-4
Operating pressure is too low
Increase pressure to 0.45MPa or more
Deterioration of Bonnet assembly
Replace Bonnet assembly
Auto-switch not
working
Displacement of Auto-switch
Adjust the location to detect range
Failure of Auto-switch
Replace Auto-switch
Operating pressure is too low
Increase pressure to 0.45MPa or more
Bonnet assembly air
leakage
Loosening of connections
Replace Bonnet assembly
Wear on piston seal
Replace Bonnet assembly