Check Valve Function
The check valve is an automatic open-close valve that does not require human or other action to open or close the valve depending on the flow of the pipe medium itself. The main function of the check valve is to stop the flow. This selection of different materials can prevent the flow of water, steam and many other media. The main material is carbon steel and low-temperature steel.
Its main feature is that the disc is closed fast, the duration of the use is longer, and the performance is more reliable.
Specifically, it can prevent the backflow of the medium, the reversal of the pump and drive motor, and the release of the container medium. The check valve has only one direction of flow, that is, it can only flow back along the inlet. So, the exit of common pumps is often installed with a check valve to prevent water from pouring into the pump. The check valve is a valve that automatically opens and close valve discs depending on the flow of the medium itself, and it is also used to prevent the backflow of the medium. It is also called the check valve, counterflow valve and back pressure valve.
The check valve is a kind of automatic valve.
Check Valve Assembly
The commonly used check valves have the following components: a valve body, valve plate, seat, pin shaft, sealing gasket, bonnet, check lifting rings, bolts and gaskets, flanges.
Diaphragm check valve: (1) outlet end; (2) sealing diaphragm; (3) the inlet
Shell material is divided into: PA66 (nylon 66), ABS (resin), PP (polypropylene), PVDF (polyvinylidene fluoride).
The diaphragm material is divided into: Silicone (Silicone), EPDM (EPDM), VITON (fluoro rubber).
Check Valve Types
According to the structure, they can be divided into lift check valve, swing check valve and butterfly check valve three kinds:
Vertical and horizontal check valves are divided into vertical and horizontal ones.
Swing check valves are divided into single, double and multi-valve types.
Butterfly check valves are straight-through type.
The above check valves can be divided into threaded connections, flange connections, welded connections and four pairs of clamps.
The material classification
Cast iron check valve
Brass check valve
Stainless steel check valve
Carbon steel check valve
Forged steel check valves
DRVZ mute check valve
NRVR silent type check valve
SFCV rubber valve backstop valve
DDCV double check valve