Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of dual plate check valve gaskets in China, also supports customized service. Please feel free to buy high quality dual plate check valve gaskets for sale here from our factory.
What Are Dual Plate Check Valve Gaskets
Dual Plate Check Valve Gaskets are located between the valve disc and valve body to ensure the sealing performance of the valve. It is usually made of elastic material such as rubber or polymer. The gasket has a certain degree of elasticity and can adapt to the valve body and disc surfaces to form a sealing contact. When the valve is closed, the gasket is compressed, preventing fluid from passing through the valve. When the valve is opened, the gasket will elastically deform slightly to ensure the smooth flow of fluid.
Structure and materials
Dual Plate Check Valve Gaskets are sealing elements designed specifically for dual plate check valves, and their construction and material selection is critical to the valve's performance.
Structure
- Sealing interface: The gasket is usually located on the contact surface of the two halves of the valve, that is, the double plate. When the valve is closed, the gasket is under pressure and deforms, filling the gap between the two plates to form a sealing interface.
- Shape: The shape of the gasket usually matches the sealing surface of the valve to ensure even pressure distribution and good sealing when the valve is closed.
Materials
- Rubber: Suitable for general water treatment and low-pressure applications. Rubber materials have good elasticity and adaptability and can resist chemical corrosion to a certain extent.
- Polytetrafluoroethylene (PTFE): Because of its excellent chemical stability and temperature resistance, PTFE gaskets are suitable for handling a variety of chemicals, especially in high temperatures and corrosive environments.
- Metal filling materials: such as asbestos, glass fiber, or carbon fiber-filled gaskets. These materials enhance the mechanical strength and wear resistance of the gasket and are suitable for high-pressure and high-temperature environments.
- Special materials: For specific applications, such as extremely corrosive or high-temperature environments, special materials may be required, such as fluorine rubber (Viton), silicone rubber (Silicone), or other high-performance synthetic materials.
| Physical Properties(Silicone Refers) | ||
| Test Method | Norm | Test Values |
| Hardness | IS048 Method M | 70±5 IRHD |
| Tensile Strength at break | ISO 37 | min 6.5 MPa |
| Elongation at break | ISO 37 | min 302% |
| Specifc Weight | ISO 2781 | 120 |
| Compression Set 25%compression-22h/150℃ on slab on O-Ring(3,53 mm) |
IS0815 IS0815 |
max 20% max 40% |
| Heat Ageing 70h/100℃ Hardness Change |
ISO 188 | max+12° |
Functions and effects
■ Sealing function: Dual plate check valve gaskets are located between the valve disc and the valve body, playing a sealing role. When the valve is closed, the gasket is compressed to ensure sealing contact between the valve and the valve body to prevent fluid backflow or leakage. The elastic material of the gasket adapts to different surface shapes to form an effective seal.
■ Preventing backflow: The main function of the dual plate check valve is to prevent backflow of fluid in the pipeline. When fluid flows in the opposite direction, the valve disc will close and rely on the gasket's sealing performance to prevent fluid flow. This prevents fluid from flowing back and protects the normal operation of the piping system.
■ Reduce pressure loss: Compared with other types of check valves, the Dual plate check valve has lower pressure loss. The design and material selection of the gasket can reduce the resistance of fluid passing through the interior of the valve, reduce pressure loss, and improve the efficiency of the system.
■ Providing Reliability: Dual plate check valve gaskets are designed and manufactured under strict quality control to ensure their reliability and durability. They can operate normally under harsh working conditions such as high pressure, high temperature, and corrosive media, and have a long service life.
Application scenarios
1. Oil and natural gas industry: Dual plate check valve gaskets are used in oil and natural gas pipeline systems to prevent backflow and leakage. They play an important role in scenarios such as oil wells, refineries, natural gas processing facilities, and pipelines.
2. Chemical industry: In chemical plants and chemical processing processes, double-piece check valve gaskets are used to prevent the backflow of chemical substances in the pipeline system and protect the safe operation of equipment and systems.
3. Electric power industry: Double-piece check valve gaskets are widely used in cooling water systems, steam systems, and hot water systems of power stations to prevent reverse flow and pressure loss.
4. Fluid treatment and water supply systems: Double-piece check valve gaskets are used in water supply systems, sewage treatment plants, and industrial fluid treatment systems to ensure one-way flow of fluid in pipelines and prevent backflow and contamination.
5. Steel and mining industry: In the steel production and mining process, double-piece check valve gaskets are used in pipeline systems to prevent medium backflow and protect equipment.
6. Automated control system: Dual plate check valve gasket plays an important role in automated control systems, such as water supply systems, heating and cooling systems, and industrial process control systems.
Installation & Maintenance
Installing and maintaining dual plate check valve gaskets are critical steps in ensuring proper valve operation and long-term reliability. Here is a detailed guide on the installation and maintenance of these gaskets:
Installation procedures
Preparation: Before installation, the valve and its adjacent piping system should be thoroughly cleaned to remove any foreign matter such as welding slag, wood chips, or plastic debris.
Check the gasket: Make sure the gasket is not damaged or deformed, and check that its material is suitable for the media it will be handling.
Position the gasket: Place the gasket correctly between the two halves of the valve, making sure the gasket evenly covers the entire sealing surface.
Install the valve: Install the valve according to the manufacturer's instruction manual, ensuring that the direction of the valve is consistent with the direction of media flow. If there is an arrow mark on the valve, follow it.
Tighten bolts: Use the correct torque to tighten bolts evenly and avoid over-tightening, which may cause gasket deformation or damage.
Test the valve: After installation is complete, test the valve to check for leaks and make sure the valve opens and closes smoothly.
Maintenance recommendations
Regular Inspections: Check the condition of the gasket regularly, especially when the valve is closed, to make sure the gasket is not worn or damaged.
Cleaning and replacement: If the gasket is found to be damaged or shows signs of media leakage, the gasket should be cleaned or replaced with a new one.
Avoid corrosion: For environments where corrosion may occur, gaskets of corrosion-resistant materials should be used and the gaskets should be inspected regularly for signs of corrosion.
Proper Storage: If a gasket needs to be replaced, the new gasket should be stored in a dry, clean environment away from contact with grease or other substances that may cause contamination.
Follow safety procedures: When performing any maintenance work, proper safety procedures should be followed, including wearing appropriate personal protective equipment and ensuring valves are closed and depressurized.
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