Materials of Construction (MOC)
| Component | Material Specification |
|---|---|
| Body & Bonnet | Ductile Iron (ASTM A536 / EN-GJS-400-15) |
| Stem / Spindle | SS 410 / SS 420 |
| Seat / Trim | EPDM / NBR / Bronze |
Technical Specifications
| Parameter | Specification / Standard |
|---|---|
| Manufacturing / Design Standard | EN 1171 / AWWA C509 / BS 5163 |
| Testing Standard | API 598 / EN 12266-1 |
| Pressure Rating | PN16 / PN25 |
Features & Benefits
Silent Non-Slam Closure
Centrally-guided disc with calibrated spring return achieves full seat contact before flow reversal, eliminating the water hammer, pressure surge, and pipeline vibration that damage pumps, pipe supports, and downstream equipment.
Spring-Assisted All-Orientation Operation
Spring return ensures positive disc closure in horizontal, vertical, and inclined pipelines -- unlike gravity-dependent swing check valves that require specific installation orientation.
Low Cracking Pressure
Lightweight disc and optimised spring pre-load provide cracking pressure as low as 0.02--0.05 bar, minimising energy loss and pressure drop in low-head pump systems.
Compact Wafer Design
Short face-to-face wafer pattern minimises weight and space, reducing pipe support requirements and installation cost compared to flanged swing or piston check valves.
Centrally-Guided Disc
Disc is guided by a central stem or post that prevents disc flutter, wobble, and seat damage under pulsating or turbulent flow conditions -- extending seat life in reciprocating pump discharge service.
High Flow Capacity
Full-port disc design with minimal central guide obstruction provides flow capacity (CV) comparable to swing check valves of equivalent size, minimising pressure drop in high-flow pump discharge headers.