Clap door
The Clap Door Valve is a specially designed non-return valve that allows fluid or gas to flow in one direction while preventing reverse flow. It adopts a hinged flap (clap door) structure, which automatically opens under forward flow pressure and quickly closes when backflow occurs, effectively protecting pipelines and equipment from reverse pressure and potential damage.
With a simple structure, low maintenance requirements, and reliable sealing performance, the Clap Door Valve is widely used in water systems, drainage pipelines, sewage treatment plants, pumping stations, marine systems, and industrial applications requiring efficient backflow prevention.
The valve is manufactured using high-quality materials and advanced production technology to ensure excellent corrosion resistance, pressure resistance, and long-term operational reliability. Customized designs are available for different installation conditions, pressure requirements, and working media.
Clap door
We provide professional OEM and ODM manufacturing services to meet various project requirements, including:
Available materials include:
Our Clap Door Valves are manufactured according to strict quality management procedures and are supplied with complete valve industry certification documents, including:
We provide reliable valve solutions with professional manufacturing capability and global OEM support.
Parameter Specifications
| Parameter | Specification |
|---|---|
| Product Name | Clap Door Valve |
| Valve Type | Non-Return Valve / Check Valve / Swing Check Valve |
| Operating Principle | Automatic opening and closing by flow pressure |
| Main Function | Prevent backflow and protect pipeline systems |
| Nominal Size | DN50–DN2000 (Customized available) |
| Pressure Rating | PN1.0–PN2.5 MPa (Customized available) |
| Working Temperature | -20℃ to +200℃ (Depending on material selection) |
| Applicable Medium | Water, wastewater, sewage, oil, gas, industrial fluids |
| Valve Body Material | Cast Iron / Ductile Iron / Carbon Steel / Stainless Steel |
| Disc (Clap Door) Material | Stainless Steel / Ductile Iron / Customized materials |
| Sealing Material | EPDM / NBR / PTFE / Metal Seal |
| Connection Type | Flanged / Wafer / Customized |
| Installation Type | Horizontal / Vertical Installation |
| Flow Direction | One-way Flow |
| Closing Method | Gravity Closing / Hydraulic Closing / Spring Assisted (Optional) |
| Design Standard | API / DIN / ANSI / GB standards |
| Face-to-Face Standard | According to customer requirements |
| Leakage Standard | API 598 / ISO 5208 |
| Corrosion Resistance | Suitable for water and harsh industrial environments |
| Maintenance Requirement | Low maintenance design |
| Service Life | Long service life with reliable performance |
| Inspection | Pressure test, sealing test, dimensional inspection |
| OEM Service | Size, material, coating, logo, packaging customization |
Industry Applications
The Clap Door Valve is widely used in industries where prevention of reverse flow and pipeline protection are required.
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%.
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