Materials of Construction (MOC)
| Component | Material Specification |
|---|---|
| Body & Bonnet | Cast Steel (ASTM A216 Gr. WCB/WCC) |
| Stem / Spindle | SS 410 / SS 304 |
| Seat / Trim | 13% Cr. SS / Stellite 6 Overlay |
Technical Specifications
| Parameter | Specification / Standard |
|---|---|
| Manufacturing / Design Standard | API 600 / BS 1414 / ASME B16.34 |
| Testing Standard | API 598 / EN 12266-1 |
| Pressure Rating | Class 150 / Class 300 / Class 600 |
Features & Benefits
Spring-Assisted Closure
Optional SS316 spring ensures rapid disc return to seat on flow reversal, preventing water hammer and backflow damage. Required for vertical upward flow installations.
Compact Face-to-Face
Short pattern design per API 594 provides compact installation dimension, reducing weight and pipe support requirements.
Low Cracking Pressure
Non-spring design opens at approximately 0.05 bar differential pressure, minimising pressure drop and energy loss in low-pressure systems.
Vertical or Horizontal Installation
Piston check valves can be installed in both horizontal and vertical pipelines, providing greater installation flexibility than swing check valves.
Stellite Seat Overlay
Stellite 6 hard-facing on seat ring resists erosion from flow impingement during closure.
Bolted Bonnet Maintenance
Standard bolted bonnet allows easy access to disc, seat, and spring without removing the valve from the pipeline.