Check valve is also known as one-way valve or non-return valve. It's a kind of valve with opening and closing part opens and closes automatically driven by flow and force of medium to prevent backflow of medium. Check valve is automatic valve, and mainly applied on pipeline with medium flows in one direction. The medium is allowed to flow only in one direction to prevent accident. Delta Valves mainly manufacture four types of check valve: swing check valve, lifting check valve, tilting disc check valve, wafer check valve and Dual plate check valve.
| Product Range | Size | Pressure Class |
|---|---|---|
| Swing Check Valve | 15 NB to 700 NB | 150# to 600# |
| Forged Steel Lift Check Valve | 15 NB to 50 NB | 800# to 2500# |
| Disc Check Valve | 15 NB to 250 NB | 150# to 300# |
| Wafer Type NRV | 25 NB to 400 NB | 150# |
| Dual Plate Check Valve | 50 NB to 400 NB | 150# , 300# & 600# |
TECHNICAL SPECIFICATIONS
| Bolted Cover Swing Check Valve | BS 1868 |
| Forged Steel Lift Check Valve | ISO 15761 |
| End to End Dimensions | ASME B16.10 |
| Flanged End Dimensions | ASME B16.5 |
| Butt Weld End Dimensions | ASME B16.25 |
| Socket Weld End Dimensions | ASME B16.11 |
| Screwed End Dimensions | ASME B 1.20.1 |
| Valve Inspection & Testing | API 598/ BS 6755 Part-I |
| Visual Inspection | MSS SP 55 |
| Non Destructive Test (RT,UT, MT,PT) | ASME B16.34 |
| Pressure - Temperature Rating | ASME B16.34 |
