Wafer Type Check Valve – Working, Design & Applications | Udhhyog
Wafer Type Check Valve – Compact Design for Efficient Flow
The wafer type check valve is a lightweight, compact, and efficient non-return valve (NRV) used where space is limited. Designed for easy sandwich-type installation between flanges, it ensures unidirectional flow and prevents backflow with minimal pressure drop.
What Is a Wafer Type Check Valve?
A wafer type check valve is a non-return valve designed with a thin profile to fit between two pipeline flanges. It uses one or two spring-loaded plates (discs) that open with forward flow and close instantly when flow reverses, minimizing water hammer.
Working Principle of Wafer Check Valve
- Forward flow pushes the disc(s) open.
- Reverse flow triggers quick spring-loaded closure.
- Prevents backflow in both horizontal and vertical lines.
Key Features
- Dual plate or single disc configuration
- Spring-assisted closure
- Low pressure drop
- Center-guided or shaft-mounted
- Maintenance-free design
Construction Materials
| Part | Materials |
|---|---|
| Body | WCB, CI, SS 304/316 |
| Disc | SS 316, Aluminum Bronze |
| Spring | Inconel, SS 316 |
| Seat | Metal or soft seated (Nitrile, EPDM, Viton) |
Wafer Check Valve Sizes and Standards
- Size Range: 1” (25mm) to 24” (600mm)
- Pressure Ratings: PN10, PN16, PN25, Class 150
- Face-to-face: EN 558-1 Series 16 / API 594
- End Connection: Wafer / Lug type (fits between ANSI/DIN/BS flanges)
Advantages of Wafer Check Valve
- Space-saving design
- Quick closing reduces water hammer
- Can be installed in both vertical & horizontal lines
- Low cost and lightweight
- No external actuator required
Limitations
- Not suitable for highly viscous or slurry fluids
- May require periodic cleaning in dirty lines
- Limited seat tightness in metal-seated versions
Applications
- Water distribution systems
- Compressed air systems
- Cooling lines
- Firefighting systems
- Boiler feed water
- HVAC and chilled water lines
Wafer Check Valve Price List (India)
| Size | Material | Price Range (INR) |
|---|---|---|
| 25mm (1”) | CI | ₹350 – ₹600 |
| 50mm (2”) | SS 304 | ₹950 – ₹1500 |
| 100mm (4”) | WCB | ₹2000 – ₹3500 |
| 150mm (6”) | SS 316 | ₹3500 – ₹6000 |
Wafer vs Swing vs Lift Check Valve
| Feature | Wafer | Swing | Lift |
|---|---|---|---|
| Installation | Compact (between flanges) | Bulky | Vertical only |
| Water Hammer | Low | Medium | Low |
| Maintenance | Minimal | Easy | Moderate |
| Cost | Low | Moderate | Moderate |
FAQs
Q1. Can wafer check valves be used for vertical flow?
Yes, they support both horizontal and vertical flows.
Q2. Are dual plate wafer valves better than single disc?
Yes, they offer balanced closing and reduced wear.
Q3. What is the face-to-face length of wafer valves?
Typically very short – as per EN 558 Series 16 or API 594.
Q4. How do I install a wafer valve?
Sandwich it between two pipe flanges and tighten bolts evenly.
Related Posts:
- Types of Check Valve
- Swing Check Valve
- Lift Check Valve
- Wafer Check Valve Price
- Wafer Check Valve Suppliers
Conclusion
Wafer type check valves are an ideal solution for compact, cost-efficient backflow prevention. They’re especially suited for HVAC, industrial water, and utility systems.
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