Actuators

Petrosadid: Actuators

A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process. Actuators may be only to open and close the valve, or may allow intermediate positioning; some valve actuators include switches or other ways to remotely indicate the position of the valve.

Used for the automation of industrial valves, actuators can be found in all kinds of process plants. They are used in waste water treatment plants, power plants, refineries, mining and nuclear processes, food factories, and pipelines. Valve actuators play a major part in automating process control. The valves to be automated vary both in design and dimension. The diameters of the valves range from one-tenth of an inch to several feet.

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Diaphragm Actuators

Diaphragm actuators are designed to control the flow, level and the pressure of fluid to respond to demand for fine process control and various plant systems. The 3600 actuators will satisfy customer’s needs with its high reliability, durability and performance.

Specification:

• Easy maintenance – Easy to assemble and disassemble.

• Reduce the maintenance cost by simplified the design of components

• Good performance – Provide the maximum strength and reliable high performance

• Field reversible – Actuator air action can be changed in the field for increased flexibility and reduced inventory

• Flexibility – Wide selection of optional accessories available including override

• Compact design – More compact and lighter than other existing actuators. Designed for easy installation and convenient maintenance on site

• Multiple spring design – Available to insert three springs to six springs maximum. Suitable for various working pressure from low to high instrument air pressure

• Separate hand wheel – Adapting independent spindle, it does not damage the connected parts between handle spindle and worm gear

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Rotary Cylinder Actuators

Rotary cylinder actuators are designed to operate rotary valves such as ball valves, butterfly valves and plug valves for throttling or on-off service.

Performance

• Ideal high torque

• Reliability

• Low hysteresis

• Light weight

• Easy maintenance

Design

• Double acting and spring return

• Double piston

• Wide selection of optional accessories available

• Wide adjustable range (Maximum rotation angle -100°)

• Manual overrides are option (declutch hand wheel)

• Over stroke (-5~95 degrees) for all rotary valves

• Mounting flange dimensions in accordance with ISO 5211

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Linear Piston Actuators

Linear piston actuators are designed to operate sliding-disc valves, such as wedge gate valves, knife gate valves and parallel slide valves. This actuator is compact and has a long stroke and high thrust.

Performance

• Long stroke (maximum 600mm)

• High thrust

• Good Reliability

• Low hysteresis

• Light weight

• Easy maintenance

Design

• Double acting and spring return

• Single piston. Tandem pistons are option

• Wide selection of accessories are available

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Quarter-Turn Scotch-Yoke Valve Actuators

Pneumatic and hydraulic scotch-yoke valve actuators have been designed specifically to guarantee long cycle life in the most demanding applications and environmental conditions. A fabricated steel frame, coupled with an all-steel construction, results in lighter and more corrosion resistant scotch-yoke valve actuators than traditional designs employing castings

Application:

Automation of any quarter-turn mechanism; including ball, butterfly & plug valves and louvers & dampers.

Operating Ranges

2.7 to 12 Barg (40 to 174 psig)

Supply Pressures

13 to 250 Barg (189 to 3,625 psig)

Torque Outputs

200 to 680,000 Nm (1,770 to 6,018,000 lb in)

Temperatures

Ultra-low: -65 to +80°C (-85 to +176°F)

Low: -45 to +60°C (-49 to +140°F)

Standard: -20 to +80°C (-4 to 176°F)

High: -20 to +140°C (-4 to +284°F)

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