China Ductile Cast Iron Rubber Flap Check Valve Factories, Exporter
Product Description
Check Valve / Non-Return Valve Overview
Check valve, also known as one-way valve, check valve, back pressure valve, this type of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, and belongs to an automatic valve. The function of the check valve is to prevent the backflow of the medium, the reverse rotation of the pump and its driving motor, and the discharge of the medium in the container. Double-plate check valve is a very common type of check valve. By choosing different materials, the wafer check valve can be applied to water, steam, oil in petrochemical, metallurgy, electric power, light industry, food and other industries, nitric acid, acetic acid, strong oxidizing medium and urea and other media.
Rubber Flap Check Valve Features
Rubber flap check valve The rubber flap is made of steel plate, negative rod and reinforced nylon cloth as the backing, and the outer layer is covered with rubber. The valve flap switch life can reach 1 million times. The valve adopts the design of full flow area, which has the characteristics of small head loss, not easy to pile up various debris, and easy maintenance. The valve is mainly suitable for water supply and drainage system and can be installed at the water outlet of the pump to prevent backflow and water hammer from damaging the pump. The valve can also be installed on the bypass pipe of the water inlet and outlet pipes of the reservoir to prevent the backflow of pool water into the water supply system.
Technical Specifications & Standards
| Size & Pressure Rating & Standard | |
|---|---|
| Size | DN50-DN500 |
| Pressure Rating | PN6，PN10, PN16, CL150 |
| Face to Face STD | API609, BS5155, DIN3202, ISO5752 |
| Connection STD | PN6, PN10, PN16, DIN 2501 PN6/10/16, BS5155 |
| Material Specifications | |
| Body | Cast Iron(GG25), Ductile Iron(GGG40/50), Carbon Steel(WCB A216), Stainless Steel(SS304/SS316/SS304L/SS316L) , Duplex Stainless Steel(2507/1.4529), Bronze, Aluminium Alloy. |
| Disc | DI+Ni, Carbon Steel(WCB A216), Stainless Steel(SS304/SS316/SS304L/SS316L) , Duplex Stainless Steel(2507/1.4529), Bronze, DI/WCB/SS coated with Epoxy Painting/Nylon/EPDM/NBR/PTFE/PFA |
| Stem/Shaft | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel |
| Seat | NBR, EPDM/REPDM, PTFE/RPTFE, Viton, Neoprene, Hypalon, Silicon, PFA |
Product Gallery
Our Advantages
If regular valves, our lead time is short because of our huge stocks for valve parts.
Our regular customers have been working with us more than 10 years as we always keeping our high-level QC for our products.
Our price is competitive because we process valve parts by ourselves.
Frequently Asked Questions
A check valve (also called a one-way valve or back pressure valve) is an automatic valve opened and closed by pipeline media flow. Its primary functions are preventing medium backflow, avoiding reverse rotation of pumps and drive motors, and stopping fluid discharge from containers.
With customizable materials, wafer check valves handle water, steam, oil, nitric acid, acetic acid, strong oxidizing media, and urea across petrochemical, metallurgy, electric power, light industry, and food processing applications.
The rubber flap combines a steel plate, negative rod, reinforced nylon cloth backing, and an outer rubber cover, delivering a switch life of up to 1 million cycles. Its full flow area minimizes head loss, resists debris buildup, and simplifies upkeep.
It is primarily installed at the water outlet of pumps in water supply and drainage systems to prevent water hammer and pump damage. It can also be placed on reservoir inlet/outlet bypass lines to prevent pool backflow into water networks.
Valves are available in sizes from DN50 to DN500 with pressure ratings including PN6, PN10, PN16, and CL150, compliant with standards such as API609, BS5155, DIN3202, and ISO5752.
We machine valve components in-house to optimize production costs, maintain extensive component inventory for rapid turnaround times, and uphold rigorous QC standards trusted by long-term clients for over 10 years.
