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 ...

A double acting cylinder will use hydraulic power to both extend and ... These symbols represent some of the most common actuators or inputs. Similar to an electronic circuit this is how you ...