Dual Plate Check Valve
The Test Torque for a Dual Plate Check Valve depends on the Nominal Diameter (DN), pressure rating (PN), and actuator design. Below is an indicative Test Torque chart that shows typical torque values required for testing the valve's opening and closing mechanism.
Dual Plate Check Valve
The Dual Plate Check Valve, also known as a double-disc check valve, is designed to allow unidirectional flow while preventing backflow in pipeline systems. It features two spring-loaded semicircular discs mounted on a central hinge pin, which open when fluid flows in the forward direction and close automatically when flow reverses, minimizing water hammer and protecting pumps and piping networks.
This valve is compact, lightweight, and has a low-pressure drop due to its streamlined flow path. The dual plate design ensures quick closure, reliable sealing, and long service life. It is widely used in water supply, wastewater, HVAC, pumping stations, fire protection, industrial processes, and marine applications.
Body Materials:
Disc Materials:
Spring Materials:
Seal Materials:
Parameter Specifications
| Item | Specification |
|---|---|
| Product Name | Dual Plate Check Valve |
| Valve Type | Double-Disc Check Valve |
| Nominal Size | DN50–DN2000 (2"–80") |
| Pressure Rating | PN10, PN16, PN25, PN40 |
| Body Material | Cast Iron, Ductile Iron, Carbon Steel, SS304/316 |
| Disc Material | SS304/316, Bronze, Ductile Iron with Epoxy Coating |
| Spring Material | SS304/316, Inconel |
| Seal Material | EPDM, NBR, Viton, PTFE |
| Connection Type | Wafer, Flanged, Lugged |
| Flange Standard | ANSI, DIN, EN, JIS, GB/T |
| Operating Temperature | -20°C to +200°C |
| Maximum Working Pressure | Up to 4.0 MPa |
| Closing Mechanism | Spring-Assisted / Gravity Closure |
| Cracking Pressure | 0.02–0.05 MPa |
| Installation Position | Horizontal / Vertical |
| Leakage Rate | ISO 5208 Rate A |
| Flow Characteristic | Full Bore / Low-Pressure Drop |
| Design Standard | API 594, API 6D, EN 12850 |
| Face-to-Face Standard | EN 558 |
| Inspection & Testing | API 598, EN 12266 |
| Surface Coating | Fusion Bonded Epoxy (FBE) |
| Applicable Media | Water, Air, Oil, Gas, Steam, Neutral Liquids |
Industry Applications
Material customization plan
Customized 316L stainless steel valves forGerman chemical enterprises. Resistant tostrong corrosion, suitable for their acidicmedium transportation systems, with aservice life extended to over 8 years.
Structural optimization design
For the Saudi desert project, the valve stemsealing structure was changed to a doublebellows design to address the leakage issuein the high-temperature and dustyenvironment, and it was highly recognizedby the customers.
Interface standard adaptation
Customized API 600 standard valves for acertain company in the United States. Theflange size is fully compatible with ANSIB16.5, ensuring zero error during on-siteinstallation and reducing the constructionperiod by 30%.
