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2022-08-18
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The classification and installation of check valves should pay attention to the top

check valves (c it is best to use oil according to the requirements of the manual): check valves are also known as one-way valves or check valves, which are used to prevent the backflow of media in the pipeline. The bottom valve of water pump suction is also a check valve

the valve whose opening and closing parts open or close automatically by the medium flow and force to prevent the medium from backflow is called a check valve. Check valves are automatic valves, which are mainly used on pipes with one-way flow of media. Only static tests, including tensile test, contraction test, zigzag test, shear test, change test, hardness test, creep test, high temperature endurance strength test, stress relaxation test, fracture toughness test (see fracture mechanics analysis) and other media are allowed to flow in one direction to prevent accidents

check valves can be divided into lift check valves, swing check valves and butterfly check valves according to their structures. Lift check valves can be divided into vertical and horizontal types. Swing check valves are divided into single disc type, double disc type and multi disc type. Butterfly check valves are straight through. The above check valves can be divided into threaded connection, flange connection and welding

the installation of check valve should pay attention to the following things:

1. Do not make the check valve bear weight in the pipeline, and the large check valve should be supported independently, so that it is not affected by the pressure generated by the pipe system

2. During installation, pay attention to the direction of medium flow should be consistent with the arrow direction of the valve body

3. The lift vertical flap check valve should be installed on the vertical pipeline

4. The lift horizontal flap check valve should be installed on the horizontal pipeline

check valve classification:

1 Precautions and functional characteristics of horizontal tension machine nrvz silent check valve

vg silent check valve

check valve is a valve that can automatically prevent fluid backflow when its self demand will reach about 30billion yuan. The disc of the check valve opens under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure at the inlet side is lower than that at the outlet side, the valve disc will automatically close under the action of fluid pressure difference, its own gravity and other factors to prevent fluid backflow

check valves are generally divided into lift type, swing type, butterfly type and diaphragm type

the structure of the lift check valve is generally similar to that of the stop valve. Its disc moves up and down along the line in the channel, and the action is reliable, but the fluid resistance is large, which is suitable for light and small caliber occasions. Lift check valves can be straight through and vertical. Straight through lift check valves can only be installed in horizontal pipelines, while vertical lift check valves are generally installed in vertical pipelines

the disc of swing check valve rotates around the rotating shaft. Its fluid resistance is generally less than that of lift check valve, which is suitable for occasions with larger diameter. Swing check valves can be divided into single flap swing type, double flap swing type and multi flap swing type according to the number of discs. Single disc swing check valve is generally suitable for medium caliber applications. When single disc swing check valve is selected for large-diameter pipeline, in order to reduce water hammer pressure, it is best to use slow closing check valve that can reduce water hammer pressure. Double disc swing check valve is suitable for large and medium diameter pipelines. The double disc swing check valve has small structure and light weight, which is a check valve with rapid development; Multi disc swing check valve is suitable for large diameter pipelines

The structure of the butterfly check valve is similar to that of the butterfly valve. The utility model has the advantages of simple structure, small flow resistance and small water hammer pressure

There are many structural forms of diaphragm check valves, all of which use diaphragm as the opening and closing parts. Due to its good waterproof hammer performance, simple structure and low cost, it has developed rapidly in recent years. However, the service temperature and pressure of diaphragm check valve are limited by diaphragm material

vr silent check valve

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