Non-Return Flap Design Swing Check Valve

Non-Return Flap Design Swing Check is designed for high flow systems (diameter DN50-DN1200, pressure PN16-PN40), full-bore flow channel (flow coefficient Cv: 0.2-0.5) equipped with self-lubricating hinges, can handle abrasive media containing≤5mm solid particles, and is suitable for temperatures ranging from -30℃to 400℃. It is available in 316L stainless steel, duplex steel. The spring-free design extends the maintenance cycle to more than 8 years, and its performance far exceeds that of traditional lift check valves. It is suitable for oil pipelines, power plant condensation systems and chemical corrosive media scenarios

Structural design and working principle

TheNon-Return Flap Design Swing Check Valve Structural design and working principle mainly can divide into three parts. At first, Tilted flap,Non-Return Flap Design Swing Check Valve with stainless steel or duplex steel, with a thickness of 1/5~1/8 of the pipe diameter, and the surface can be hard chrome plated.It Connected to the valve body through the top hinge pin, the tilt angle is usually 5°~15°, and gravity and medium pressure are used to achieve rapid opening and closing.

Next itfeatured in Low resistance flow channel, because it have Full bore design (Full Bore), the flow resistance coefficient (Kv value) is 40%~60% lower than that of traditional lift check valves; Also, The flap opening angle reaches 75°~85°, reducing the pressure loss caused by turbulence, and is suitable for large flow scenarios (such as DN1200 water pipelines).

It have various Sealing system,Non-Return Flap Design Swing Check Valve seat can be selected from EPDM, NBR or metal hard seals, and the leakage level meets the API 598 Class IV standard; When closed, the contact time between the flap and the sealing surface is≤0.2 seconds, which effectively prevents water hammer impact. When the medium flows forward, the pressure pushes the valve disc to open; when the flow rate returns to zero or flows in reverse, the valve disc automatically closes due to its own weight and the reverse pressure difference.

Typical application areas:

1. Water plant

2. Pump outlet backflow prevention for crude oil pipelines;

3. Condensate recovery system for thermal power plants;

4. Sludge return control for sewage treatment plants;

5. Interception protection for corrosive media (such as 50% sulfuric acid) in chemical plants.