This practice provides guidance in the selection of manual and power-actuated valve operators. The selection criteria for manual valve operators apply to handwheels and tee-wrenches. The selection criteria for power-actuated valve operators, on the other hand, apply to stem nut and handwheel driven valve operators of the electric, pneumatic, and hydraulic types.

1.1 This practice provides guidance in the selection of manual and power-actuated valve operators.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.