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Check valve is one of the commonly used valves. It refers to the valve that automatically opens and closes the valve disc depending on the flow of the medium itself, which is used to prevent the backflow of medium. For a variety of types, different check valves have different functions. Check valve is to rely on the flow of the medium itself and automatically open and close the valve disc, with the prevention of medium backflow valve, also known as check valve, one-way valve, reverse flow valve and back pressure valve. Check valve is a kind of automatic valve. Its main function is to prevent the reverse flow of medium, reverse rotation of pump and drive motor, and discharge of container medium.

Type of check valve:

1. DIDLINK Lift check valve

2. The disc of the swing check valve is disc-shaped and rotates around the rotating shaft of the valve seat channel. Because the inner channel of the valve is linear, the flow is smaller than that of the lift check valve. It is suitable for low velocity and large caliber occasions with irregular flow, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lifting type. Swing check valve is divided into single valve type, double valve type and most half type. The three types are mainly divided according to the valve diameter to prevent the medium from stopping flow or reverse flow and reducing hydraulic impact.

3. Compression type check valve: This valve is used as boiler feed water and steam cut-off valve, it has the comprehensive function of lifting check valve and stop valve.

4. Butterfly check valve

5. In line check valve: valve with disc sliding along the center line of valve body. Pipeline check valve is a new type of valve. It is small in size, light in weight and good in processing. It is one of the development directions of check valve. But the fluid resistance coefficient is slightly larger than the swing check valve. Check valve model compilation method (such as h41h-16c in order): additional models of check valve: HH (micro resistance slow closing check valve), Bi temperature check valve, HQ (ball type check valve). 1. Check valve type: H stands for check valve. 2. Check valve connection: 4 represents flange, surface welding, 7 represents clamp. 3. Check valve type: 1 represents lifting type, 2 represents vertical type, 4 represents swing type, 6 represents double valve type

It is butterfly shaped. 4. Check valve seal: B (Babbitt), f (fluoroplastic), H (stainless steel), m (Monel), X (rubber), y (mineral alloy), w (direct processing). 5. Check valve pressure: 16 (pressure: 16 kg), PN 1.6-25 MPa, scale 150lb-2500lb, standard 5k-63k. 6. Check valve material: q-ductile iron, c-carbon steel, p-304, r-316, a-titanium alloy, 1-chromium molybdenum steel

Several common types of check valve: check valve with lifting clip: h71x, h71h; check valve with butterfly double disc: h76xH76x; wafer check valve: H74H, h74i|, h74m; silent check valve: h42h, h42w; micro resistance slow closing check valve  hh44h, hh46h, hh49h; rubber disc check valve: hc44x; silencing check valve: hc41h, hc41x Hc41t; lifting check valve: h41h, H41W; slide ball check valve: hq41x; welded check valve: h61y H62Y、H64Y。