This standard provides the basic requirements for double-acting and spring return hydraulic valve actuators design and performance. The standard is to provide hydraulic actuators that can easily be ...

ISA96.04 – The basic requirements for hydraulic valve actuators of the single- and double-acting types used for on-off and modulating applications. The standard will define the basic hydraulic ...

A spring returns the actuator after its stroke (top). A spring returns the piston to it starting position and hydraulic fluid leaves the cylinder. A double-acting cylinder (bottom) has fluid ...

Scotch yoke actuators provide torque from a linear cylinder mechanism. They can be either single or double acting, producing torque as high as 45 million lb-in., driving through comparatively ...