This standard provides requirements for the specification of self contained electro-hydraulic linear and rotary valve actuators@ both double acting and single acting@ used for on-off/isolating@ positioning and continuous modulating duties. Self contained electro-hydraulic actuation is defined as any actuator which: a) Utilizes hydraulic fluid as the driving medium b) Requires only electric power and a control signal to operate c) Has its own dedicated electronic controller d) Has its own dedicated hydraulic power unit (HPU) This standard does not apply to electro-hydraulic@ multi-turn rotary actuators which drive a threaded stem. Other requirements@ or conditions of use@ different from those indicated in this standard@ shall be subject to negotiations between purchaser and the manufacturer/supplier@ prior to order. Purpose The purpose of this standard is to establish minimum design requirements and to assist the user in specifying electro-hydraulic valve actuators.