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A Screw Down Non-Return (SDNR) Valve is a type of check valve designed to allow unidirectional flow while providing the ability to manually regulate fluid movement. Unlike standard non-return valves, SDNR valves have a screw-down mechanism that enables partial or complete flow control when necessary. This feature makes them ideal for applications requiring both isolation and backflow prevention. Commonly used in industries such as marine, oil and gas, water treatment, and steam systems, SDNR valves offer reliable performance, leak-proof sealing, and enhanced system safety.
Features Of SDNR
- Unidirectional Flow
- Leak-Proof Sealing
- High Flow Capacity
- Corrosion and Pressure Resistant
- Smooth Operation
- Easy Maintenance
Applications Of SDNR
- Marine Industry
- Oil and Gas Industry
- Water Treatment Plants
- Steam Systems
- Chemical Processing
- Power Plants
Specifications Of SDNR
| Size Range | 15mm (½") to 600mm (24") or as per requirement |
| Body Material | Cast Iron, Cast Steel, Stainless Steel, Brass, Bronze |
| Disc Material | Stainless Steel, Bronze, Gunmetal |
| Pressure Rating | PN10, PN16, PN25, PN40, ANSI Class 150 & 300 |
| Temperature Range | -10°C to 450°C (Depending on material selection) |
| End Connections | Flanged (ANSI, DIN, BS), Threaded, Welded |
| Flow Direction | Unidirectional (Prevents backflow) |
| Sealing Mechanism | Metal-to-Metal or Soft-Seated for Leak-Proof Sealing |
| Operation | Manual Screw Down Mechanism |
| Installation | Suitable for Horizontal and Vertical Pipelines |
| Applications | Steam, Water, Oil, Chemicals, Marine, Power Plants |
