Why is my valve leaking from the stem?

Stem leakage is usually caused by: 1) Worn or damaged stem packing (most common), 2) Damaged packing flange or gasket, 3) Scoring or wear on the stem surface, 4) Incorrect packing material for service temperature, 5) Over-tightened packing causing extrusion. Fix: Replace stem packing, inspect stem for damage, ensure correct packing type and installation.

Why is my ball valve leaking when closed?

Ball valve leakage when closed can be caused by: 1) Debris trapped on seats causing local leakage, 2) Worn or damaged ball seats (PTFE deformation or erosion), 3) Improper actuator torque (too low - seats not compressed properly), 4) High differential pressure pushing ball against downstream seat, 5) Thermal expansion of seats in hot service. Fix: Clean seats, verify actuator sizing, check for physical damage.

Why is my control valve vibrating?

Control valve vibration can be caused by: 1) High flow velocity through partially open valve (acoustic vibration), 2) Cavitation (localized pressure drop causing bubble collapse), 3) Mechanical resonance from trim components, 4) Insufficient valve stiffness (undersized valve body), 5) Instability from poorly tuned positioner. Vibration can damage seats, trim, and cause premature failure.

Why is my pneumatic actuator not moving?

If pneumatic actuator is not moving: 1) Check air supply - is there pressure? 2) Check solenoid valve - is it energizing? 3) Check pilot valves for blockage, 4) Verify actuator is not seized (corrosion, debris), 5) Check spring for breakage (spring-return), 6) Verify positioner is not locked. For electric actuators: check power supply, motor, and limit switches.

Valve Troubleshooting Guide

Select your valve problem below to diagnose the issue and get expert recommendations for repair. This guide covers leakage, vibration, actuator failure, noise, and more.

Tip: Troubleshooting approach varies by valve type. This guide covers Ball, Gate, Globe, Butterfly, and Check valves. For specific actuator issues, see the Pneumatic or Electric Actuator sections.

Select Your Problem

💧

Leakage (Seat/Body)

Valve drips or flows when closed. External leakage visible.

🌊

Stem Leakage

Fluid escaping around the stem or bonnet area.

⚙️

Actuator Won't Move

Pneumatic or electric actuator not functioning.

📳

Valve Vibration

Abnormal vibration or shaking during operation.

🔊

Excessive Noise

Loud noises from valve - cavitation, aerodynamic.

🔧

Hard to Operate

Valve requires excessive force to open/close.

⚠️

Rapid Wear/Erosion

Valve failing faster than expected.

💥

Water Hammer

Thumping or banging sounds in piping.

Troubleshooting Result

Possible causes and recommended actions

Quick Checks Before Calling for Service

Common Valve Problems Reference

Ball Valve Common Issues

Leakage past closed position: Debris on seats, worn PTFE seats, insufficient actuator torque, incorrect seat material for temperature
Stem leakage: Damaged or worn stem packing, incorrect packing installation, damaged stem surface
Excessive torque: Seized stem bearing, damaged gear operator, actuator not sized correctly

Gate/Globe Valve Common Issues

Bonnet leakage: Damaged bonnet gasket, loose bonnet bolts, corrosion between bonnet and body
Valve won't close fully: Worn seat faces, debris in seating area, damaged stem or wedge
Stem seizure: Packing too tight, stem corrosion, lack of lubrication

Butterfly Valve Common Issues

Leakage past disc: Damaged seat, incorrect actuator torque setting, worn or deformed seat
Disc interference: Incorrect pipe alignment, misaligned disc at assembly, thermal expansion
High torque: Damaged or corroded seat, actuator not sized correctly, debris on seat

Check Valve Common Issues

Check valve hammering: Too fast closing, missing or weak springs, incorrect installation orientation
Valve won't reseat: Worn or damaged check disc/seat, spring failure, debris trapped
Excessive wear: High velocity service, frequent cycling, abrasive media

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