Valves

Engineering, Sizing & Selection

Valve Sizing: Precise valve sizing using CV and KV calculations to match flow requirements and pressure conditions for optimal performance.
Pressure & Temperature Rating: Verification of pressure-temperature ratings against ASME and API standards to ensure safe operation at design conditions.
Material Compatibility: Expert material selection based on fluid composition, pressure class, and temperature to prevent corrosion and premature failure.
Actuator Sizing: Proper sizing of pneumatic, electric, and hydraulic actuators to ensure reliable valve operation under all process conditions.
Control Valve Selection: Application-specific selection of control valves with appropriate trim characteristics for accurate flow regulation and stability.

Flange Bolt-Up: Controlled torque and tensioning of valve flange connections using calibrated tools to ensure leak-free gasket seating.
Pipe Alignment: Precision alignment of valve bodies with piping to prevent uneven flange loading and distortion during operation.
Actuator Mounting: Correct mounting and calibration of valve actuators with proper bracketry, linkages, and travel limit settings.
Pressure Testing: Hydrostatic and pneumatic pressure testing of installed valves to verify shell and seat integrity before service handover.
Functional Checkout: Full stroking and positioner calibration of control valves to confirm stroke time, linearity, and control signal response.

Gasket Replacement: On-site replacement of valve body and bonnet gaskets using correct materials to resolve leaks without removing the valve from line.
Packing Adjustment: In-situ adjustment and replacement of valve stem packing to eliminate external leakage while maintaining acceptable thrust.
Lubrication: Field lubrication of valves, plug cocks, and quarter-turn mechanisms to ensure smooth operation and prevent seizure.
Seat Lapping: On-site lapping and grinding of valve seats and discs to restore tight shut-off and extend service intervals.
Leak Detection: Systematic valve leak surveys using acoustic and tracer gas methods to identify and prioritize fugitive emission sources.

Seat Leak Testing: Low-pressure and high-pressure seat leak testing per API 598 and FCI 70-2 standards to quantify internal leakage rates.
Valve Autopsy: Detailed disassembly inspection and failure analysis of problematic valves to identify root causes and recommend corrective actions.
Non-Destructive Testing: Radiographic, ultrasonic, and magnetic particle inspection of valve bodies and pressure-boundary welds for hidden defects.
Cycle Testing: Automated cycle testing to evaluate valve endurance, torque trends, and seal degradation under repeated operation.

Body Machining: Precision machining of valve bodies to repair corroded or damaged flange faces, gasket surfaces, and bolt hole patterns.
Trim Replacement: Replacement of internal trim components including discs, seats, stems, and plugs to restore original valve performance.
Stem Repair: Straightening, grinding, and hard-facing of valve stems to correct run-out, surface damage, and corrosion pitting.
Weld Repair: Qualified welding repair of valve bodies and bonnets using matching filler metals followed by post-weld heat treatment.
Full Rebuild: Complete valve disassembly, inspection, machining, reassembly, and testing to return the valve to OEM specifications.

Pneumatic Actuator Service: Overhaul and repair of pneumatic diaphragm and piston actuators including spring replacement and seal renewal.
Electric Actuator Service: Maintenance and repair of electric valve actuators including motor, gearbox, limit switch, and torque switch calibration.
Positioner Calibration: Setup and calibration of smart and analog valve positioners for accurate control response and diagnostic reporting.
Emergency Shutdown Testing: Functional testing of ESD valves to verify fail-safe operation, trip speed, and partial stroke test capability.

PRV Recertification: Pressure relief valve removal, testing, repair, and recertification to ASME Section VIII and API 527 requirements.
Control Valve Diagnostics: Advanced diagnostic testing using HART and fieldbus tools to detect friction, deadband, and hysteresis in control valves.
High-Alloy Valve Service: Specialized repair and maintenance of duplex, super duplex, and exotic alloy valves for corrosive and sour service applications.
Cryogenic Valve Service: Inspection, repair, and testing of cryogenic valves for LNG, oxygen, nitrogen, and other low-temperature fluid services.