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Wholesale Rubber Flap Check Valve Nbr Disc 4 Inch Manufacturers, Factory
Product Description
Specifications
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.
Material Specifications
| Components Name | Material |
|---|---|
| Valve body / Valve cover | Cast iron, ductile iron, cast steel |
| Valve petal | Rubber Combination components |
| Spring | Stainless steel |
Dimensions
| DN (mm) | L | D | D1 | dn | n |
|---|---|---|---|---|---|
| 50 | 203 | 165 | 125 | 17.5 | 4 |
| 65 | 216 | 185 | 145 | 17.5 | 4 |
| 80 | 241 | 200 | 160 | 17.5 | 8 |
| 100 | 292 | 220 | 180 | 17.5 | 8 |
| 150 | 356 | 285 | 240 | 22 | 8 |
| 200 | 495 | 340 | 295 | 22 | 8 |
| 250 | 622 | 395 | 350 | 22 | 12 |
| 300 | 698 | 445 | 400 | 22 | 12 |
| 350 | 787 | 505 | 460 | 22 | 16 |
| 400 | 914 | 565 | 515 | 22 | 16 |
| 450 | 978 | 615 | 565 | 26 | 20 |
| 500 | 978 | 670 | 620 | 26 | 20 |
| 600 | 1295 | 780 | 725 | 30 | 20 |
Frequently Asked Questions (FAQ)
What media are suitable for NBR and EPDM rubber valve discs?
NBR (Nitrile Rubber) valve discs are oil and water-resistant, ideal for conventional water and oil media. EPDM valve discs excel in resistance to acid, alkali, and aging, making them suitable for sewage treatment and weak chemical media transportation.
What standard does this rubber flap swing check valve conform to?
This valve is manufactured in strict compliance with the DIN F6 standard, offering standardized flange dimensions for easy replacement and integration into pipeline networks.
How does the stainless steel limit device function?
The built-in stainless steel limit block restricts the maximum opening angle of the valve disc (typically 60° to 70°). This prevents excessive deformation caused by high-pressure fluid impacts and ensures the disc aligns accurately when resetting.
What is the temperature rating for this check valve?
The valve is designed to operate safely within a temperature range of -20°C < T < 120°C, making it reliable for ambient and mid-temperature applications.
What connection methods are available for pipeline installation?
The standard connection method is flange connection. Small-caliber models can also be customized with clamp connections to fit various pipeline setup requirements.
