Principle and classification of check valves
Check valve The function of this type of valve is to allow the medium to flow in one direction only, and to prevent the opposite direction. Usually, this kind of valve works automatically, and the valve flap opens under the pressure of fluid flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-overlapping disc of the disc act on the valve seat, thus cutting off the flow.
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 three types: single-flap, double-flap and multi-flap.
3. Butterfly check valve is straight-through.
The above check valves can be divided into four types in connection form: threaded connection, flange connection, welding connection and butt clamp connection.
1. Cast iron check valve
2. Brass check valve
3. Stainless steel check valve
4. Carbon steel check valve
5. Forged steel
check valve functional classification
1.DRVZ silent check valve Stainless steel check valve Stainless steel check valve
2.DRVG silent check valve
3.NRVR silent check valve
4.SFCV rubber flap check valve
5.DDCV double disc check valve
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