What are the characteristics of piston type flow regulating valve

What are the characteristics of piston type flow regulating valve

Because the opening and closing part of the valve is a cylindrical piston design, when the valve is opened, the cylindrical piston will not be affected by the fluid's blind plate force, and the operating torque of the valve will be greatly reduced, and its torque value is only conventional. One-third to one-fifth of the torque value of a gate valve or butterfly valve. Piston opening and closing parts are linearly driven by a crank-slider mechanism, and the relationship between the valve flow coefficient and the valve opening degree is approximately a linear function (linear). The stainless steel piston moves axially under the guidance of the copper alloy guide rails. The combination of the two materials allows the deposited sediments to not accumulate between them and further reduces the operating torque of the valve.
The fan blade ring is a valve internal fluid guide member with equilateral distribution vanes. As the fluid flows through the valve, the fluid upstream is forced to divert into small bundles of small streams that whirl out and are directed to the center of the pipeline. This prevents cavitation from occurring on the pipeline. damage. Because the cavitation bubble is extremely unstable and will vanish, the center of the pipeline will be destroyed instead of the pipe wall surface, so the cavitation damage to the pipeline can be avoided. When the flow of water is cut off or blocked, the flow of water through a small area of ​​the passing area, the flow rate will increase, and the pressure will be reduced, so that when the water pressure is reduced to the evaporation pressure, the bubbles will evaporate.
The squirrel-cage cylinder is a perforated part that extends from the piston. The size of the rat cage can be designed according to different working conditions. As the water passes through the squirrel cage, it is throttled into many high-speed fluids. The fluid passes through the squirrel cage and ejects into the center of the flow channel and collides with each other. Because the cavitation is controlled in the center of the flow channel, its energy will cancel each other or gradually attenuate through the center of the pipeline, which will not cause vibration or cavitation damage to the pipeline. The velocity energy (kinetic energy) of the fluid is converted into pressure energy after passing through the piston valve. The pressure energy can destroy cavitation bubbles generated in the squirrel cage in a straight line direction, thereby protecting the damage of the fluid to the pipeline.

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