Check valve, also known as check valve, single flow valve, check valve or check valve, its role is to ensure that the medium in the pipeline directional flow without backflow. The opening and closing of check valve depends on the flow force of the medium to open and close. Check valve belongs to automatic valve products, check valve only allows the medium to flow in one direction of the pipeline to use, to prevent the phenomenon of medium backflow. It has a wide range of applications, and can be used in large and small calibers, various media and power station high voltage system.
The principle of check valve: check valve open refers to relying on the medium forward flow to open the disc, the same reason the medium back flow to promote the disc and closed, check valve is also known as a check valve, one-way valve, reverse flow valve and back pressure valve. The main function of the valve is to prevent the reverse flow of the medium, to prevent the reversal of the pump and the driving motor and the discharge of the container medium. It is also used for safety protection in auxiliary systems where the pressure may rise above the system pressure.
Check valve classification: check valve is mainly used to prevent the use of media flow back in the pipeline. The bottom valve and the duck bill valve also belong to the check valve system.
Check valve can be divided into lift type, swing type, disc type three:
The lifting type is divided into vertical and horizontal 2 kinds, the lifting structure is moving along the axis.
Examples:
(1) Lift type silent check valve is used in water supply and drainage engineering quality requirements of the pipeline; At the same time, it can be installed at the outlet of the pump, and the pipe network with relatively high pressure (PN2.5Mpa) is an important product of waterproof impact check valve.
(2) Lifting type silencer check valve is suitable for high-rise building water supply and drainage system and the outlet of the pump, not suitable for sewage pipeline occasions.
(3) Horizontal check valve is suitable for diving, drainage, sewage pump, especially for sewage and sludge system.
The swing type is divided into single-valve type, double-valve type and multi-valve type. The swing type structure is selected according to the center of gravity rotation.
Examples:
(1) Selective open type rubber check valve is applied in the urban water pipe network system, which is not suitable for the sewage pipeline with much sediment.
(2) Swing type single valve check valve has the widest use range, can be installed in water supply and drainage, petroleum, chemical, metallurgy, industrial and other pipelines, the most appropriate occasions for space restrictions.
The dish structure is straight-through.
Example:
(1) Disc double disc check valve is mainly used in high-rise building water supply pipeline, containing corrosive media and sewage in the use of fluid pipe network.
(2) Swing type single valve check valve has the widest use range, can be installed in water supply and drainage, petroleum, chemical, metallurgy, industrial and other pipelines, the most appropriate occasions for space restrictions.
Horizontal check valve is suitable for diving, drainage, sewage pump, especially for sewage and sludge system.
Post time: Mar-24-2021