A valve that opens or closes automatically by the force of the medium flow to prevent the medium from flowing back is called a check valve. Check valves belong to the automatic valve category and are mainly used in pipelines where the medium flows in one direction. They only allow the medium to flow in one direction to prevent accidents.
Structural classification
According to the structure, it can be divided into three types: lift check valve, swing check valve and butterfly check valve:
1. Lift check valves are divided into vertical and horizontal types.
2. Swing check valves are divided into single-flap, double-flap and multi-flap types.
3. Butterfly check valves are straight-through.
The above check valves can be divided into four types in terms of connection form: threaded connection, flange connection, welding connection and clamp connection.
Material classification
1. Cast iron check valve
2. Brass check valve
3. Stainless steel check valve
4. Carbon steel check valve
5. Forged steel check valve
Function classification
1. DRVZ silent check valve
2. DRVG silent check valve
3. NRVR silent check valve
4. SFCV rubber flap check valve
5. DDCV double flap check valve