| Technical Specifications | Product Scope |
|---|---|
| Size | DN50–DN1400 / NPS 2–56 |
| Pressure Class | Class 150–2500 |
| Design Standards | API 6D; API 594; ASME B16.34 |
| Structure | Dual plate / one-piece body / non-penetrating pin |
| Operation | Automatic / torsion-spring assisted |
| Ends | Flanged / butt-weld / clamp |
| Body Materials | Carbon steel / alloy steel / stainless steel / nickel-based alloys |
Integral body construction is offered in forged or cast forms.
Torsion springs assist plate closure and support sealing at low differential pressure.
The pin arrangement avoids through-body penetrations and reduces leakage paths.
Cobalt-alloy hardfacing supports wear, corrosion and scuffing resistance at the sealing interface.
Automatic non-return protection in refinery and petrochemical systems.
Check-valve duties for forward-flow service and reverse-flow prevention.
Dual-plate non-return protection in packaged equipment and constrained piping layouts.
Material verification, shell-pressure testing and seat-leakage checks support the inspection scope.
Valve drawings, datasheets, material records and inspection reports support technical coordination.
