VALVE ACTUATORS - h1018v2

Types of Valves Summary

Hammer Handwheel

Mechanical Science Volume 2 of 2
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VALVE ACTUATORS DOE-HDBK-1018/2-93 Valves VALVE ACTUATORS Some type of actuator is necessary to allow for the positioning of a valve. Actuators vary from simple manual handwheels to relatively complex electrical and hydraulic manipulators. EO 1.6 DESCRIBE the construction and principle of operation for the following types of valve actuators: a. Manual b. Electric motor c. Pneumatic d. Hydraulic e. Solenoid Introduction Valve actuators are selected based upon a number of factors including torque necessary to operate the valve and the need for automatic actuation. Types of actuators include manual handwheel, manual lever, electrical motor, pneumatic, solenoid, hydraulic piston, and self-actuated. All actuators except manual handwheel and lever are adaptable to automatic actuation. Manual, Fixed, and Hammer Actuators Manual actuators are capable of Figure 30 Fixed Handwheel placing the valve in any position but do not permit automatic operation. The most common type mechanical actuator is the handwheel. This type includes handwheels fixed to the stem, hammer handwheels, and handwheels connected to the stem through gears. Handwheels Fixed to Stem As illustrated in Figure 30, handwheels fixed to the stem provide only the mechanical advantage of the wheel. When these valves are exposed to high operating temperatures, valve binding makes operation difficult. ME-04 Rev. 0 Page 44

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