10
2023
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07
What are the uses of electric ball valves
Electric ball valves for incompressible fluids. The selection of electric ball valves for incompressible fluids is based primarily on their ability to prevent sudden closure due to reverse flow at closing, resulting in unsustainably high shock pressures. The selection of this type of valve as a low pressure drop valve is usually considered in the second step only. For this electric ball valve, one step is to evaluate the required closing speed and the second step is to select the type of electric ball valve that can meet the required closing speed.
The electric ball valve has a conical, porous basket section, and this internal section is used to support a matching diaphragm. The valve is installed in the pipeline between two flanges or between pipe joints. The fluid medium passing through the cone lifts the diaphragm off its seat, and then the medium passes through. When the downstream flow stops, the diaphragm will regain its original shape and close very quickly.
A noteworthy use is for purge gas piping fed into pipelines handling slurry and colloidal media. In this way, the diaphragm exhibits high operational reliability, which would wear out very quickly if other valves were used. Electric ball valves use corrugated annular rubber diaphragms. When the valve is closed, the corrugated edge of the diaphragm is tucked into the center of the media passage.
The downstream media opens the pleated diaphragm, causing the edge of the diaphragm to retract from the seat. The diaphragm electric ball valve closes very quickly because the diaphragm is elastically tensioned in the open position and the displacement of the diaphragm edge from the fully open to the closed position is very short. This diaphragm type electric ball valve is more suitable for a wide range of media flow.
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