Swing Check Valve – Working, Types & Uses Guide | Udhhyog
Swing Check Valve – Working, Types, and Use Cases Explained
The swing check valve is one of the most commonly used types of non-return valves (NRVs) in pipelines. It allows fluid to flow in one direction and automatically prevents backflow when the flow reverses — all without any external actuator.
What Is a Swing Check Valve?
A swing check valve is a type of NRV that has a disc suspended on a hinge or shaft. The disc swings open when fluid flows in the forward direction and closes when reverse flow is detected.
How Does a Swing Check Valve Work?
- Forward flow pushes the disc open.
- Reverse flow swings the disc shut to prevent backflow.
- Self-acting, no manual or electric control required.
Components of a Swing Check Valve
| Part | Function |
|---|---|
| Body | Main housing for flow |
| Disc | Moves with flow to open/close valve |
| Hinge | Allows swinging motion |
| Hinge Pin | Connects hinge to body |
| Seat Ring | Provides sealing surface |
| Bonnet | Covers and protects internal components |
Dimensions & Standards
- ASME B16.34 / API 6D / BS 1868
- Flange dimensions: ASME B16.5 / DIN / IS 1538
- Sizes: 15mm to 600mm (1/2" to 24")
- Pressure Class: PN10 to PN40 / Class 150 to 600
Types of Swing Check Valves
- Single Disc
- Double Disc (Dual Plate)
- Tilting Disc
- Soft Seated
- Metal Seated
Materials of Construction
| Component | Common Materials |
|---|---|
| Body | Cast Iron, Ductile Iron, WCB, SS 304/316 |
| Disc | Stainless Steel, Bronze, Rubber-coated |
| Seat | Rubber, PTFE, Gunmetal |
| Pin/Hinge | SS304, SS316, High-Tensile Steel |
Applications of Swing Check Valve
- Water Systems
- Oil & Gas
- Firefighting Systems
- HVAC and Chilled Water Lines
- Chemical Plants
Advantages of Swing Check Valves
- Self-operated
- Low pressure drop
- Simple construction
- Available in various materials
Limitations
- Not suitable for pulsating or low-flow systems
- Prone to water hammer
- Requires sufficient pressure to operate
Swing vs Lift vs Wafer Check Valves
| Feature | Swing Check | Lift Check | Wafer Check |
|---|---|---|---|
| Flow Direction | Horizontal/Vertical | Vertical | Both |
| Closure Speed | Moderate | Fast | Fast |
| Space Required | More | Moderate | Least |
| Water Hammer Risk | Medium–High | Low | Medium |
| Maintenance | Easy | Difficult | Moderate |
Installation Tips
- Ensure correct flow direction (arrow on body)
- Use gaskets for flanged connections
- Install with gravity-aided disc swing for vertical setups
Swing Check Valve Price (India)
| Size (NB) | Material | Approx. Price (INR) |
|---|---|---|
| 25mm (1”) | Cast Iron | ₹350 – ₹600 |
| 50mm (2”) | CI / SS | ₹650 – ₹1200 |
| 100mm (4”) | CI / SS | ₹1500 – ₹2800 |
| 150mm (6”) | Cast Steel | ₹2800 – ₹5000 |
FAQs – Swing Check Valve
Q1. Can swing check valves be installed vertically?
Yes, but only for vertical downward flow.
Q2. Are swing check valves suitable for high pressure?
Yes, if rated for PN25 or Class 300 and above.
Q3. What is the difference between swing and flap check valve?
Flap is lighter and used for low-pressure; swing is more robust.
Q4. Do swing check valves reduce flow?
Very minimal pressure drop compared to other NRVs.
Related Post :
- Check Valve Types
- Lift Check Valve
- Wafer Type Check Valve
- Swing Check Valve Price
- Swing Check Valve Suppliers
Conclusion
Swing check valves are essential for preventing backflow in water, oil, and industrial pipelines. Their simplicity and versatility make them a top choice for unidirectional flow control.
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