The core function of double plate check valve (i.e. double flap check valve or butterfly check valve) is to achieve one-way control of fluid and system protection through double flap structure, and its specific functions are reflected as follows:
- The core function and working principle
Prevent backflow of media
Through the spring-assisted double valve flap design, the fluid stops or reverse flow when the rapid closure, blocking reverse flow
Avoid pipeline pressure fluctuations, equipment damage or mixed media contamination caused by backflow
Protection of system equipment
Prevent pumps, valves and other equipment due to reverse flow of media triggered by mechanical reversal damage
In the chemical industry, water treatment and other scenarios to isolate corrosive or toxic media, enhance system safety
- Structure and performance advantages
Fast response and low flow resistance
Double valve flap rotates to open under the impetus of fluid, and the flow path is similar to a straight pipe when it is fully open, so the pressure loss is extremely small.
Spring forced reset shortens the closing time (milliseconds), effectively reducing the risk of water hammer.
Compact design for complex scenarios
Clamping or flange connection, the structure length is only 1/3 of the traditional check valve, saving installation space.
Wide temperature range (-196℃~540℃), pressure resistance up to 42MPa.
Multi-media applicability
The valve body can be selected from stainless steel, carbon steel, rubber or PTFE sealing surface, water, steam, oil and acid and alkali media.
- Typical application areas
Municipal engineering: high-rise building water supply and drainage system to prevent flooding and backflow, to prevent sewage backflow pollution basement
Industrial systems: petrochemical, electric power industry to protect the pumping unit, to prevent high temperature steam or corrosive fluids backflow
Environmental protection water treatment: sewage treatment plant pumping station outlet, blocking the treated sewage back to the treatment facilities