Flapper Check Valve Product Information
Flapper check valve is also called flexible check valve, whose disc is rubber coated. Rubber disc check valve is mainly made up of body, cover and disc, and the disc adopts steel board, steel bar and nylon as underlay, and coated with rubber, its open and close service life could up to one million times. Flapper check valve adopts full bore design, which makes it have small head loss, not easy accumulate foreign matters, but easy for maintenance. Flexible check valve is applicable to water supply and drainage system, which can be mounted on the pump outlet to prevent of backflow and water hammer. Rubber disc check valve can be also mounted on the bypass pipe of reservoir inlet and outlet pipe to prevent the water in the reservoir flow back to water supply system. Flowspec Luokai can design and manufacture the flapper check valve according to BS5153 and MSS SP-71 with sizes of 2”~32” (DN50~DN800mm). Welcome to contact us for detailed information and best quotes if you have any questions or inquiries.
1. FEATURES
- Full bore design
- BC, bolted cover
- Flexible rubber disc
- Silient valve open and close
3. STANDARDS
- Design & manufacturing: BS5153, MSS SP-71
- Face to face: BS5153, ASME B16.10, DIN F6
- Flanged ends: EN1092-2, ASME B16.1/B16.42, AS4087
- Inspection & testing: API598 / EN12266
2. TECHNICAL SPECIFICATIONS
- PN10/PN16/Class 125LB/Class 150LB
- Size: 2”~32” (DN50~DN800mm)
- Materials: cast iron (GG25, ASTM A126 B), ductile iron (GGG50, GJS500, DIN1693, BS EN1563, ASTM A536 65-45-12)
- Working pressure: 10bar, 16bar, 200psi
- Applicable medium: water, sewage, waste water
- Applicable temperature: -10℃~+80℃
4. APPLICATIONS
- Water supply plant
- High building industry
- Mining, steel industry
- Metallurgy plant, power plant
- Oil, chemical industry
- Textile, pharmaceutical industry
- Waste water, sewage treatment industry
- Food, pharmaceutical industry
- Fire fighting industry
Why Choose Flowspec Luokai
45+ Years Experience
Founded in 1978, manufacturing industrial valves for over four decades with proven reliability worldwide.
Global Certifications
ISO 9001, CE/PED, WRAS, FM, UL, API approved — compliant with international quality and safety standards.
OEM Custom Solutions
Flexible design and manufacturing per your specifications — material, size, pressure, actuation tailored to project needs.
Worldwide Delivery
Exported to 5 continents — North & South America, Europe, Middle East, Southeast Asia, and Africa.
Our Service Promise
Strict Quality Control
Every valve tested to API 598, EN 12266 before shipment
Timely Global Delivery
Reliable logistics to 5 continents with secure packaging
OEM & Custom Design
Tailored material, size, pressure and actuation to your specs
Dedicated After-Sales
Technical support and service throughout product lifecycle


