1. Product Definition
A check valve (also known as a non-return valve or one-way valve) is a mechanical device designed to allow fluid flow in one direction while preventing reverse flow. It ensures system safety, prevents backflow contamination, and protects downstream equipment.
2. Core Design & Types
- Swing Check Valve: Features a hinged disc that swings open/closed. Ideal for horizontal pipelines.
- Lift Check Valve: Uses a piston-like disc that lifts vertically. Suitable for high-pressure systems.
- Dual-Plate Check Valve: Compact design with two spring-loaded plates. Low-pressure drop, fast response.
- Ball Check Valve: Employs a ball to block reverse flow. Common in low-viscosity fluids.
- Tilting Disc Check Valve: Angled disc for reduced turbulence. Used in steam or gas systems.
3. Key Specifications
| Parameter | Details |
|---|---|
Pressure Rating | 150 psi to 2500 psi (varies by material and type) |
Temperature Range | -20°C to 550°C (dependent on material; e.g., stainless steel handles higher temps) |
Size Range | 1/2" to 48" (DN15 to DN1200) |
Material Options | Cast Iron, Ductile Iron, Stainless Steel (SS304/SS316), Brass, PVC, Alloy 20 |
Connection Type | Flanged, Threaded, Wafer, Butt-Weld, Socket-Weld |
Sealing Material | EPDM, NBR, Viton, PTFE, Metal-to-Metal |
Cracking Pressure | 0.5 psi to 15 psi (minimum pressure to open the valve) |
Compliance | API 594, ASME B16.34, ISO 5752, ANSI/ASME standards |
4. Applications
- Water & Wastewater: Prevent backflow in pumps and filtration systems.
- Oil & Gas: Protect pipelines and compressors in upstream/downstream operations.
- Chemical Processing: Resist corrosive media (e.g., acids, alkalis).
- Power Generation: Steam systems, cooling water circuits.
- HVAC: Maintain directional flow in heating/cooling systems.
5. Critical Features
- Zero-Leakage Design: Tight sealing ensures no reverse flow.
- Low Maintenance: No external actuators; operation relies on flow dynamics.
- Versatility: Adaptable to liquids, gases, and slurries.
- Durability: Robust construction for high-cycle applications.
6. Selection Guidelines
- Match material compatibility with fluid type (e.g., stainless steel for corrosive fluids).
- Ensure pressure/temperature ratings exceed system requirements.
- Consider flow velocity and pressure drop limitations.
- Verify installation orientation (horizontal/vertical).
Keywords
Check Valve
A check valve (also known as a non-return valve or one-way valve) is a mechanical device designed to allow fluid flow in one direction while preventing reverse flow. It ensures system safety, prevents backflow contamination, and protects downstream equipment.
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