China Suppliers Factory Rubber Lined Dual Plate Check Valve - Size 1/2 to 10, PN14-PN40 Pressure
Product Details
A rubber line check valve, also known as a duckbill valve or rubber flap valve, is a type of check valve that is commonly used in applications where the flow of fluids or gases needs to be regulated in one direction.
The valve is made of flexible rubber material and is designed to allow flow in one direction while preventing backflow or reverse flow. It consists of a conical or flat rubber sleeve or flaps that act as a one-way door. When the pressure on the upstream side of the valve is greater than the pressure on the downstream side, the valve opens, allowing fluid or gas to flow through. When the pressure on the downstream side becomes greater than the upstream side, the valve closes, preventing backflow.
Rubber line check valves are often used in various industries, including wastewater treatment, sewage systems, drainage systems, irrigation systems, and industrial piping systems. They are preferred in applications where a tight seal is required, as the rubber material provides excellent sealing properties.
These valves are typically easy to install and require minimal maintenance. However, it is important to select the appropriate size and material of the valve based on the specific application requirements.
Key Features
Specification
| NO. | Part | Material | Code |
|---|---|---|---|
| 1 | Alignment Body | Nodular Cast Iron | GGG40.3 |
| 2 | Insert Body | Nodular Cast Iron | GGG40.3 |
| 3 | Set Screw | Steel | - |
| 4 | Liner | NBR/EPDM | - |
| 5 | Spring | Stainless Steel | SS304/SS316 |
| 6 | Plate | Aluminium Bronze alloy | C954 |
| 7 | Shaft | Stainless Steel | SS316 |
| 8 | Shaft Plug | Stainless Steel | SS316 |
| 9 | Thrust Washer | Teflon | - |
Dimensions
| Size | A | B | C | D | E | F(PN10/PN16) | G(PN10/PN16) | H | J | K | Weight(kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DN50 | 159 | 101 | 84.8 | 66.7 | 50 | 125 | 18 | 28.5 | 47.6 | 54 | 2.27 |
| DN65 | 179 | 120 | 99 | 79.4 | 50 | 145 | 18 | 36.5 | 58.7 | 54 | 2.72 |
| DN80 | 200 | 133 | 116 | 92.1 | 50 | 160 | 18 | 41.3 | 69.9 | 54 | 3.63 |
| DN100 | 220 | 171 | 143 | 118 | 60 | 180 | 18 | 54 | 87.3 | 63.5 | 6.81 |
| DN125 | 250 | 198 | 172 | 144 | 63 | 210 | 18 | 67.5 | 113 | 66.7 | 9.08 |
| DN150 | 285 | 222 | 201 | 172 | 75.5 | 240 | 22 | 80.2 | 141 | 79.4 | 11.8 |
| DN200 | 340 | 280 | 255 | 222 | 94.5 | 295 | 22 | 106 | 192 | 98.4 | 19.52 |
| DN250 | 406 | 336 | 309 | 276 | 97.5 | 350/355 | 22/26 | 130 | 230 | 102 | 26.33 |
| DN300 | 482 | 406 | 366 | 327 | 126 | 400/410 | 22/26 | 159 | 275 | 130 | 45.4 |
| DN350 | 533 | 450 | 394 | 356 | 176 | 460/470 | 22/26 | 172 | 305 | 181 | 60.29 |
| DN400 | 596 | 488 | 488 | 406 | 158 | 515/525 | 26/30 | 197 | 356 | 162 | 77.18 |
| DN450 | 635 | 545 | 506 | 460 | 180 | 565/585 | 26/30 | 222 | 406 | 184 | 99.88 |
| DN500 | 715 | 595 | 553 | 508 | 211 | 620/650 | 26/33 | 248 | 460 | 216 | 130.3 |
Frequently Asked Questions
What is a rubber line check valve?
A rubber line check valve (also known as a duckbill valve or rubber flap valve) is a flexible one-way valve designed to allow fluids or gases to flow in one direction while automatically preventing backflow or reverse flow.
How does the valve operate?
The valve operates based on pressure differentials. When upstream pressure is higher than downstream pressure, the flexible rubber sleeve or flaps open to allow flow. When downstream pressure becomes higher, the sleeve closes tightly to prevent backflow.
What are the primary applications for these valves?
They are widely used in industrial and municipal piping systems, including wastewater treatment plants, sewage systems, drainage setups, and agricultural irrigation systems where tight sealing is essential.
What materials are used in the construction of the valve?
Key structural components are typically made of Nodular Cast Iron (GGG40.3), Stainless Steel (SS304/SS316), and Aluminium Bronze alloy (C954). The flexible sealing liner is made of high-quality rubber compounds like NBR or EPDM.
Do rubber line check valves require high maintenance?
No, these valves are designed for stable, long-term operation. They are generally easy to install and require minimal maintenance, provided that the appropriate size and material are selected for the specific application environment.
Product Packaging
