Lift Check Valve – Working, Applications & Comparison Guide | Udhhyog
Lift Check Valve – Working, Applications & Comparison Explained
The lift check valve is a robust type of non-return valve (NRV) used in pipelines where high-pressure, unidirectional flow must be maintained. It opens automatically under forward flow pressure and closes quickly to prevent backflow.
What Is a Lift Check Valve?
A lift check valve consists of a disc that moves vertically inside the valve body. When fluid pressure exceeds the cracking pressure, the disc lifts and allows flow. When the pressure drops or reverses, gravity and back pressure push the disc back onto the seat to block flow.
Working Principle
- Fluid enters the inlet and lifts the disc vertically.
- Flow continues as long as upstream pressure is sufficient.
- On reverse flow, the disc drops back into place and seals the valve.
Lift Check Valve Diagram (Text Representation)
[INLET] → | ⬆️ Disc lifts → [Flow Continues] → | ⬇️ Disc drops → [Reverse Blocked]
Parts of a Lift Check Valve
| Part | Description |
|---|---|
| Body | Encases flow path |
| Disc | Moves up/down with pressure |
| Seat | Surface where disc rests to stop backflow |
| Guide | Aligns the disc during movement |
Where Are Lift Check Valves Used?
- High-pressure water pipelines
- Petroleum refineries
- Boiler feed systems
- Air and gas lines
- Process industries with vertical flow lines
Material Selection
| Component | Material Options |
|---|---|
| Body | Cast Steel, WCB, SS 304, CI |
| Disc | SS 316, Bronze |
| Seat | Metal or PTFE soft seal |
Advantages
- Quick closing – prevents water hammer
- Strong sealing capability under high pressure
- Compact for vertical installations
Disadvantages
- Only suitable for vertical upward flow
- Disc can stick if particles collect
- More pressure drop than swing type
Lift Check Valve vs Swing Check Valve
| Feature | Lift Check | Swing Check |
|---|---|---|
| Flow Orientation | Vertical Only | Horizontal / Downward Vertical |
| Closing Speed | Fast | Slower |
| Water Hammer | Low Risk | Higher Risk |
| Maintenance | Moderate | Easy |
| Space | Compact | Bulky |
Lift Check Valve Price Range (India)
| Size | Material | Estimated Price (INR) |
|---|---|---|
| 25mm | CI | ₹400 – ₹700 |
| 50mm | WCB / SS | ₹850 – ₹1400 |
| 100mm | SS 304 | ₹1800 – ₹3000 |
FAQs
Q1. Can lift check valves be installed horizontally?
No. They are strictly for vertical upward flow lines.
Q2. Are lift check valves good for steam?
Yes, especially with metal-seated models in SS or WCB.
Q3. What is the major benefit over swing check?
Faster closure and lower water hammer risk.
Q4. Do lift check valves need maintenance?
Occasional cleaning to avoid disc jamming is recommended.
Related Post :
- Check Valve Types
- Swing Check Valve
- Wafer Type Check Valve
- Check Valve Price List
- Lift Check Valve Suppliers
Conclusion
If you're dealing with vertical pipelines, high-pressure systems, or steam applications, a lift check valve is a dependable solution. Make sure to select the correct size and material for durability and efficiency.
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