Check Valve and flange gate valves are the same type of Universal Valve, which is closed by a ball. The ball is a Universal Valve that opens and closes through the center line of the rotating valve. Universal Valve are mainly used to cut off, distribute and change the flow direction of media on pipelines.
Working principle: During the opening process: in the closed position, the ball is subject to the mechanical pressure of the valve and is pressed against the valve seat. Turn the steering wheel counterclockwise, the valve rod moves in reverse, and the triangular flat surface at the bottom lifts the ball off the seat. When it is about to close, the ball has rotated 90° without contact with the valve seat. To the fully open position, the valve rod rises to the extreme position and the ball rotates to the fully open position.
Check Valve structural features: Top-mounted structure: The Universal Valve installed on the pipeline can be inspected and repaired directly online, effectively reducing device shutdown and reducing costs. This kind of Universal Valve is generally installed horizontally in the pipeline. Friction-free opening and closing: Completely solves the problem of traditional Universal Valve affecting sealing due to friction between sealing surfaces. Low torque design The Universal Valve rod with special structure design can be easily opened even with small hands. Wedge sealing structure. The valve presses the ball wedge to the valve seat to seal according to the mechanical force provided by the valve rod, so as to prevent the sealing performance of the valve from being affected by changes in the pipeline pressure difference. Single valve seat design. This solves the problem that the medium in the middle cavity of the Universal Valve affects the safety of use due to abnormal pressure increase. The sealing surface is a self-cleaning structure. When the ball tilts away from the valve seat, the fluid in the tube passes through 360° evenly along the dense cover of the ball. The high-speed fluid not only eliminates the local brush on the valve seat, but also washes away the condensation on the tight cover. Achieved the purpose of self-cleaning.
1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length;
2. Simple structure, small size and light weight;
3. Tight and reliable. At present, plastic is widely used as the sealing surface material of Check Valve, which has good sealing performance and has also been widely used in vacuum systems;
4. Easy to operate, quick to open and close, just rotate 90° from fully open to fully closed, convenient for long-distance control;
5. It is easy to maintain, the Check Valve has a simple structure, the sealing ring is generally movable, and it is easy to disassemble and replace;
6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes, it will not cause erosion of the sealing surface of the Universal Valve;
7. It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and can be applied from high vacuum to high pressure.
