What is a Check Valve? It is necessary to master the basic knowledge

The Check Valve is a forced-sealing Universal Valve. When the Universal Valve is closed, pressure must be applied to the valve disc to forcefully prevent leakage on the sealing surface. When the medium enters the Universal Valve from under the valve, the resistance overcome by the operating force is the thrust generated by the wear force of the valve and gasket and the medium pressure, and the force to close the Universal Valve is greater than the force to open the Universal Valve, so the diameter of the Valve Stem larger. Otherwise, the top of the valve stem will bend. After the emergence of self-sealing valves, the flow of the valve media is changed to enter the cavity of the valve from above the valve. At this time, due to the influence of the dielectric pressure, the force to close the valve is small, but due to the force to open the valve is large, the diameter of the valve is reduced accordingly. Moreover, this shape of the Universal Valve is also strict in the role of dielectric. When the Check Valve opens, when the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached the maximum, indicating that the Universal Valve has reached the fully open position. Therefore, the fully open position of the Check Valve should be determined by the stroke of the valve disc.

1. Simple structure, convenient to manufacture and maintain.
2. The working stroke is small and the opening and closing time is short.
3. Good sealing performance, small friction between sealing surfaces and long service life.
No matter what it is, it has advantages and disadvantages, and Check Valve are no exception:
1. The fluid resistance is large and the force required to open and close is large.
2. Not suitable for media with particles and high viscosity.
3. Poor adjustment performance.
Structural features of Check Valve:
1. Compared with gate valves, Check Valve have a simpler structure and are more convenient to manufacture and maintain.
2. The sealing surface is not easy to wear and scratch, has good sealing performance and long service life.
3. When opening and closing, the valve disc stroke is small, the opening and closing time is short, and the height of the Universal Valve is small.
4. The valve disc and valve stem are designed as an integrated structure, which is compact and safe to use.
Check Valve have three structural forms
1. Straight-through type, DC type, angle type, among which the straight-through type is the most commonly used. The angle type can be installed at the corner of the pipeline system, and the DC type has the smallest flow resistance among the Check Valve.
2. Configure pneumatic and electric devices according to user needs to meet the needs of remote control and program control.