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About Pneumatic Valve Actuators
Pneumatic valve actuators adjust valve position by converting air pressure into linear or rotary motion. Linear motion devices open and close gate, globe, diaphragm, pinch and angle-style valves with a sliding stem that controls the position of the closure element. Rotary motion devices move ball, plug and butterfly valves a quarter-turn (90°) or more from open to close. There are several actuation methods for pneumatic valve actuators. Diaphragm actuators are used mainly with linear motion valves, but are suitable for rotary motion valves when used with some type of linear-to-rotary motion linkage. Piston cylinder actuators are suitable for both linear and rotary motion valves. Typically, rack- and-pinion actuators are used to transfer the linear motion of a piston cylinder actuator to rotary motion. Rack-and-pinion designs are also suitable for adjusting manually-operated valves. Scotch yoke devices are used to transfer linear motion to rotary motion. By contrast, vane actuators are suitable only for rotary motion valves. Link and lever actuators attach a splined or slotted lever to the valve shaft in order to transfer the linear motion of diaphragm or piston cylinder actuators to rotary motion.
Specifications for pneumatic valve actuators include stem diameter, actuation time, control signal input, acting type, fail-safe position, air supply pressure range, and operating temperature. Actuation time is the time required to fully close the valve. Milliampere, voltage, and pressure signals are common control signal inputs. Single-acting devices use air pressure to actuate the valve in one direction and a compressed spring to actuate the valve in the other. Double-acting devices use air pressure to actuate the valve in both directions. The failsafe position determines whether pneumatic valve actuators open or close the valve in the event of a power failure or the loss of the control signal. Air supply pressure range is the input pressure needed to achieve the desired torque or thrust output. Stroke length, number of turns, and actuator force are other important specifications for pneumatic valve actuators that move linear motion valves. Rotary motion devices indicate whether the full range of motion is a quarter-turn, a nominal 180° or 270° turn, or multiple turns for more than 360°.
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Engineering Web: Pneumatic Valve Actuators
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Valve Actuators Information | Business.com Valve Actuators Home » Directory » Industrial Goods & Services » Industrial Supplies » Controls » Actuators » Valve Providers of valve actuators. See Business.com, Inc. Information |
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Valve Positioners The digital valve controller receives feedback of the valve travel position plus supply and actuator pneumatic pressure. |
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ISA | Electric Servo Valve Actuators - A Technology Transfer -... Electric Servo Valve Actuators - A Technology Transfer - ISA 2002 Terry L. Kimble; Donald M. Bockhahn See International Society of Automation Information |
Part Numbers for Pneumatic Valve Actuators
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 0820017503 | PLC Radwell | BOSCH | Not Provided | PNEUMATIC VALVE FOR MANF W/ 24V ACTUATORS 18242102 |
| 15S623 | PLC Radwell | DWYER | Not Provided | PNEUMATIC VALVE ACTUATOR |
| 15S630 | PLC Radwell | DWYER | Not Provided | PNEUMATIC VALVE ACTUATOR |
| 15S620 | PLC Radwell | DWYER | Not Provided | PNEUMATIC VALVE ACTUATOR |
| 15S621 | PLC Radwell | DWYER | Not Provided | PNEUMATIC VALVE ACTUATOR |
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