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Piston Type Lift Check Valve Suppliers - Carbon Steel & Cast Iron Factory in China, DN50-DN350 Size
Product Details
A lift check valve is a type of non-return valve designed to allow fluid flow in one direction only. Its primary components consist of a valve body, a disc (or piston) that seals closely against a seat, and a guiding mechanism (such as a stem or cage) that directs the disc's vertical movement.
When fluid flows in the forward direction, pressure lifts the disc upward, opening a passage for flow. Once the flow ceases or reverses, the disc returns to its seat—aided by gravity or spring force—forming a secure seal that prevents backflow.
Key Features
- Reliable backflow prevention
- Corrosion resistance & durability
- Low flow resistance
- Easy maintenance
Specification
| No. | Part Name | Material |
|---|---|---|
| 1 | Body | GS-C25 / CF8 / CF3 |
| 2 | Disc | 2Cr13 / F304 / F316 |
| 3 | Gasket | S.S / PTFE |
| 4 | Bonnet | GS-C25 / CF8 / CF3 |
| 5 | Hexagon Nut | ASTM A193 2H / A193-8 / A193-8M |
| 6 | Bolt | ASTM A193 B7 / A193 B8 / A193 B8M |
Dimensions
| DN | L | D | D1 | D2 | B | Z-D | H |
|---|---|---|---|---|---|---|---|
| 15 | 130 | 95 | 65 | 45 | 14 | 4-14 | 77 |
| 20 | 150 | 105 | 75 | 55 | 14 | 4-14 | 77 |
| 25 | 160 | 115 | 85 | 65 | 14 | 4-14 | 80 |
| 32 | 180 | 135 | 100 | 75 | 16 | 4-18 | 85 |
| 40 | 200 | 145 | 110 | 85 | 16 | 4-18 | 95 |
| 50 | 230 | 160 | 125 | 100 | 16 | 4-18 | 105 |
| 65 | 290 | 180 | 145 | 120 | 18 | 4-18 | 120 |
| 80 | 310 | 195 | 160 | 135 | 20 | 8-18 | 130 |
| 100 | 350 | 215 | 180 | 155 | 20 | 8-18 | 140 |
| 125 | 400 | 245 | 210 | 185 | 22 | 8-18 | 155 |
| 150 | 480 | 280 | 240 | 210 | 24 | 8-23 | 180 |
| 200 | 600 | 335 | 295 | 265 | 26 | 12-23 | 215 |
| 250 | 730 | 405 | 355 | 320 | 30 | 12-25 | 260 |
| 300 | 850 | 460 | 410 | 375 | 34 | 12-25 | 315 |
Frequently Asked Questions
What is a lift check valve and how does it work?
A lift check valve is a non-return valve that permits fluid flow in one direction only. Incoming fluid pressure pushes the disc upward off its seat, allowing flow to pass through. When flow stops or reverses, the disc drops back onto the seat—assisted by gravity or a spring—creating a tight seal that prevents backflow.
What materials are available for the valve body and disc?
The valve body is available in GS-C25 (carbon steel), CF8 (stainless steel 304), or CF3 (stainless steel 304L). The disc can be manufactured from 2Cr13 (martensitic stainless steel), F304, or F316, offering options suited to different pressure, temperature, and corrosion requirements.
What size range is available for this lift check valve?
This lift check valve is available in nominal diameters (DN) ranging from DN15 (½ inch) up to DN300 (12 inches), covering a wide range of industrial pipeline applications. Please refer to the dimensions table above for detailed face-to-face and flange measurements.
What are the typical applications for a lift check valve?
Lift check valves are widely used in water treatment plants, chemical processing, oil and gas pipelines, HVAC systems, and steam lines. They are especially suited for systems where maintaining unidirectional flow and preventing reverse flow damage is critical.
How is maintenance performed on a lift check valve?
Lift check valves feature a bolted bonnet design, allowing easy access to internal components without removing the valve from the pipeline. Routine maintenance typically involves inspecting the disc and seat for wear or deposits, replacing the gasket if necessary, and re-torquing bonnet bolts to specification.
What is the difference between a lift check valve and a swing check valve?
A lift check valve uses a disc that moves vertically along a guided stem or cage, making it ideal for high-pressure and high-velocity applications and suitable for installation on horizontal or vertical pipelines. A swing check valve uses a hinged disc that swings open and is generally preferred for low-velocity, larger-diameter horizontal pipelines. Lift check valves typically offer a faster response to flow reversal and a more positive seal.
Product Packaging
01020304