Hydraulic and Pneumatic Cylinder and Vane-Type Actuators for Valves and Slide Gates
|Publication Date:||16 January 2016|
This standard describes hydraulic and pneumatic linear and quarter-turn actuators for operation of valves and slide gates in utility systems.
Actuator types. Actuators described in this standard consist of the following types (Figure 1):
1. Linear actuators producing a linear (push-pull) motion.
2. Quarter-turn actuators producing a rotary motion.
a. Cylinder with link and lever mechanism.
b. Cylinder with scotch yoke mechanism.
c. Rack and pinion actuator.
d. Vane actuator.
Actuator function. Actuators shall produce a rotary torque or linear thrust to actuate a valve or slide gate in open-close, throttling, or modulating service.
Excluded actuators. Electric-motor actuators are not included in this standard.
Other exclusions. This standard does not include the following: 1. Piping, controls, and positioners for actuators. 2. The mechanism connecting an actuator to a valve or slide gate.
The purpose of this standard is to define the minimum requirements for hydraulic and pneumatic cylinder, pneumatic rack and pinion, and pneumatic vane-type actuators for valves and slide gates, including sizing considerations, design, verification, delivery, handling, and storage.