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China Suppliers Rubber Flap Check Valve Nbr Disc 4 Inch - Ductile Iron Automatic Backflow Device from Factory
| Valve Type: | Swing check valve | Structure: | Rubber flap type |
| Standard: | DIN F6 | Workmanship: | Investment casting |
| Sealing direction: | Single-directional | Sealing grade: | Zero leakage |
| Temperature: | -20°C < T < 120°C | Operation: | Self-starting |
Characteristics
NBR rubber valve disc is oil and water resistant, suitable for conventional media such as water and oil; EPDM rubber valve disc is acid and alkali resistant, aging resistant, and can be used in sewage treatment and weak acid and weak alkali medium transportation scenarios.
Advantages
1 Valve Body
Made of QT450-10 and other grades of ductile iron casting, with a straight through horn mouth design for the flow channel. The inner wall is smooth and the flow area is large, which can reduce the flow resistance of the medium and avoid impurity accumulation; The main connection method is flange connection, and some small caliber models can be customized with clamp connection to meet different pipeline installation requirements.
2 Rubber Valve Disc
Made of nitrile rubber (NBR) or ethylene propylene diene monomer (EPDM) molded, integrated with the sealing surface of the valve seat, without hinges, shafts or other moving parts; The valve disc is umbrella shaped or petal shaped, with excellent elasticity and wear resistance. When opened, it can fully adhere to the inner wall of the valve body without affecting the passage of the medium.
3 Limit Device
Equipped with a stainless steel limit block, it can limit the maximum opening angle of the valve disc (usually 60°~70°), prevent excessive deformation or damage of the valve disc caused by high-pressure medium impact, and ensure precise alignment when the valve disc is reset.
Packing
Standard export wooden case packaging
Application Scenarios
Versatile enough for urban water supply and drainage, sewage treatment, fire protection systems, HVAC, water treatment plants and farmland irrigation, this valve excels in low-pressure, high-flow pipeline systems with media containing small quantities of impurities. It has established itself as the go-to anti-backflow valve choice for civil buildings and municipal engineering projects.
Frequently Asked Questions
Q
What is the difference between NBR and EPDM rubber valve discs?
NBR (nitrile rubber) valve discs are oil and water resistant, making them ideal for conventional media such as water and oil. EPDM (ethylene propylene diene monomer) valve discs offer superior acid and alkali resistance along with aging resistance, making them more suitable for sewage treatment and weak acid or alkali medium transportation environments.
Q
What is the maximum operating temperature for this swing check valve?
This valve is designed to operate within a temperature range of -20°C to 120°C, making it suitable for a wide variety of standard industrial and municipal pipeline applications.
Q
Does this valve require any manual operation or external actuation?
No. This swing check valve is self-starting, meaning it operates automatically in response to fluid flow and pressure differentials. There are no hinges, shafts, or other moving mechanical parts required for actuation.
Q
What is the purpose of the stainless steel limit device in this valve?
The stainless steel limit block restricts the maximum opening angle of the valve disc to between 60° and 70°. This prevents the disc from over-deforming or sustaining damage due to high-pressure media impact, while also ensuring accurate disc alignment and sealing upon reset.
Q
What connection types are available for this valve?
The primary connection method is flange connection, which suits most standard pipeline installations. For smaller caliber models, clamp connection can be customized upon request to accommodate specific installation requirements.
Q
What are the typical application scenarios for this swing check valve?
This valve is widely used in urban water supply and drainage systems, sewage treatment plants, fire protection pipelines, HVAC systems, water treatment facilities, and farmland irrigation networks. It is especially well-suited for low-pressure, high-flow systems and is a trusted anti-backflow solution in civil buildings and municipal engineering projects.