Interpretation of the common failure of closed - circuit globe valve
Malfunctions Possible causes Remedy Media leaks after shut-off valve is closed Leakage due to wear, vandalism or dirt on the valve body and disc seal surfaces Closing force on handwheel Insufficient (less than calculated value) Insufficient torque to open the shut-off valve, clean, grind or replace the seal Increase the closing force on the handwheel to the calculated value Check the torque sleeve adjuster, measure the stress of the joint and check the state of the motor Valve body to bonnet Media Leakage Sealability Loss due to Failure to Tighten Bolts Gasket Damaged Sealing Face of Valve Body or Valve Cover Damage Tighten Screw Plug Change Gasket Remove Valve Cover to Repair Defects and Abrasion Seal Media Leakage of Packing from Packing Box Box packing seal is not enough Packing wear Stem surface damage Tighten packing Packing nut Nothing Add filler or replace filler Clear surface Defective media Leakage of bellows Corrugated pipe damage Open the stop valve and replace the bellows Required torque to open the valve Increased lack of lubrication at the active connections Lubricated to the active connections Economical electrical devices Inoperative Electromechanical devices No electricity Check and repair of electricity Installation of the power supply line Fault phenomenon Possible causes Remedy Medium leakage after shut-off valve is closed Valve body and disc seal surface wear, damage or dirt and loss of sealing force Hand wheel closing force is not enough (less than the calculated value ) Insufficient torsional moment of the electromechanical device Open the shut-off valve, clean, grind or replace the sealing ring Increase the closing force on the handwheel to the calculated value Check the torque sleeve adjuster, measure the stress of the joint and check the state of the motor Body Leakage of seal due to non-tightening of screw cap Gasket damage Sealing surface of valve body or bonnet is damaged Tighten bolt evenly Change gasket, repair defect and grind sealing surface The medium is filled with packing Leakage of stuffing box at packing box Insufficient packing seal wear Damage to stem surface Tighten packing stuffing nut evenly Add packing or replace packing Remove surface defect medium Leakage of bellows at bellows Corrugated pipe breakage Open shut-off valve and change bellows Open the valve Increased torque required Lack of lubrication at the articulation joints Lubricate the articulation joints Check and repair electrical power supply line of the electrical device
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