プラスチックチェックバルブ

A check valve is a type of valve that opens and closes automatically based on the force of the medium itself. Its main function is to prevent the reverse flow of the medium. When the medium flows in the opposite direction, the check valve closes. Structurally, check valves are generally divided into two types: lift check valves and swing check valves.

The disc of a lift check valve generally moves along the vertical center line of the check valve body. Lift check valves can be classified into two models: horizontal and vertical. A lift check valve consists of a valve body, valve cover, stem, seat, and valve core.

The disc of a swing check valve usually rotates around a pin shaft outside the seat. Swing check valves can be divided into three types: single-disc, double-disc, and wafer-type valves. A swing check valve is composed of a valve body, valve cover, shaft, and disc.

The working principle of the check valve varies according to the pressure of the fluid itself, opening and closing dynamically to prevent the reverse flow of the medium. It is mainly used in water supply pipelines.

A suction bottom valve is a type of check valve. An elevating suction bottom valve has good sealing and low noise and is generally used in nominal diameters less than 200 mm in horizontal pipe runs. A swing bottom valve has poor sealing, high noise, and is generally used in vertical or large-diameter pipelines. The suction bottom valve is installed in the pump suction pipe and is connected to the pipe by bolts or flanges.