Valves Maintenances

We offer valves preventive maintenance, repairs and calibration services for the following valves:

  • Pressure Safety Valves and Pressure Relief Valves
  • Manual Valves
  • Actuated Valves
  • Control Valves

Pressure charts, test reports and calibration certificates are provided for each test conducted upon completion of each service.

Placeholder
Placeholder
Placeholder

1. Pressure Safety Valves (PSV) & Pressure Relief Valves (PRV)

Purpose

To ensure valves open at correct set pressure to protect equipment from overpressure.

Procedure

  • Isolate valve from system and depressurize
  • Remove PSV/PRV carefully (avoid spring damage)
  • Inspect for:
    • Spring condition
    • Seat/disc wear
    • Corrosion or blockage
  • Clean all internal components
  • Replace defective parts (spring, seat, seals)

Testing

  • Calibrate using test bench
  • Verify set pressure and reseat pressure
  • Ensure no leakage after closing

Key Note

⚠️  We always calibrate according to manufacturer standard and code (API 526 / ASME).

Placeholder
Placeholder
Placeholder

2. Manual Valves (Gate, Globe, Ball, Butterfly)d Your Heading Text Here

Procedure

  • Isolate and depressurize line
  • Open valve to release trapped pressure
  • Dismantle valve components

Inspection

  • Stem condition (bent, worn)
  • Seat and disc damage
  • Packing leakage
  • Corrosion

Maintenance

  • Replace packing and gasket
  • Lubricate stem and moving parts
  • Repair or replace damaged components

Testing

  • Functional test (open/close)
  • Leak test (seat tightness)
Placeholder
Placeholder
Placeholder

A3. Actuated Valves (Pneumatic / Electric / Hydraulic)

Procedure

  • Isolate process and power supply
  • Disconnect actuator from valve

Inspection

  • Actuator condition (air leaks, motor faults)
  • Tubing and fittings
  • Positioner calibration
  • Electrical connections

Maintenance

  • Lubricate actuator moving parts
  • Replace seals and diaphragms
  • Tighten loose wiring

Testing

  • Stroke test (0–100% opening)
  • Check response time
  • Verify signal accuracy (4–20 mA for electric)
Placeholder
Placeholder
Placeholder

4. Control Valves

Procedure

  • Isolate valve and control system
  • Remove valve from service

Inspection

  • Valve trim (plug, seat, cage)
  • Erosion and cavitation damage
  • Actuator and positioner performance

Maintenance

  • Replace worn trim components
  • Clean internal passages
  • Recalibrate positioner

Testing

  • Loop test with control signal
  • Stroke and response verification
  • Leakage test

5. General Safety Requirements (For All Valves)

  • Permit to Work (PTW) must be approved
  • Apply LOTO (Lock Out Tag Out)
  • Ensure system is fully depressurized
  • Use proper PPE (helmet, gloves, goggles, coverall)
  • Follow confined space procedure if applicable

6. Quality Control

  • Verify all replaced parts meet specification
  • Record calibration results (PSV & Control valves)
  • Ensure torque values are correct
  • QA/QC approval before commissioning

7. Documentation

  • Inspection checklist
  • Calibration certificates
  • Maintenance report
  • Test results

Conclusion

Each valve type requires specific handling and testing, especially:

  • PSV/PRV → Calibration critical
  • Control valves → Accuracy critical
  • Actuated valves → Signal & response critical
  • Manual valves → Mechanical integrity critical