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MSS SP-91-2009

Guidelines for Manual Operation of Valves

Provides guidelines for the operation of manually actuated valves as affected by the valve operator's input.

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Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [MSS]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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