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A manual eccentric hemisphere valve is a type of valve that is operated manually. It consists of a hemispherical disc that is slightly offset from the center of the valve body. This offset helps to reduce friction and wear during opening and closing of the valve.

These valves are commonly used in applications where a tight shut-off is required, such as in the oil and gas, chemical, and pharmaceutical industries. They are designed to provide reliable and accurate flow control, even in high-pressure and high-temperature environments.

To operate a manual eccentric hemisphere valve, the operator simply turns a handwheel or a lever, which in turn moves the disc to open or close the valve.