Qaswa Engineering Pvt ltd is top quality ball valve manufacturer in india Although some designs are available for simple manual throttling, manual valves are typically employed to shut off and start flow (also known as shut off or on-off valves). The best manual on-off functions are those that permit flow to pass through the valve body directly and have a full-area closing element that results in little to no pressure drop. The middle stroke position is then frequently used for manual operators.
A manual on-off valve may be used for simple throttling, but because it is not a part of a process loop, which necessitates some form of self-actuation as well as input from a controlling device to the valves, it is not regarded as a control valve.
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