Monday, January 30, 2017

Rotary Vane Valve Actuators

Rotary vane actuator
Rotary vane actuator
A rotary vane actuator is simply a part of an automated valve assembly: its role is to change the position of the valve, converting the motive force of fluid pressure into torque and applying it to a valve stem.

Quarter turn valves are widely used in industrial process automation. Their application is primarily for operations requiring fully open or fully closed valve trim positions, although some do provide modulating service. A rotation of the valve stem through a 90 degree arc will reposition quarter turn valve trim between open and closed positions. A rotary vane actuator is well suited for driving this type of valve, with its own 90 degree arc of movement.

A rotary vane actuator operates quarter turn valves, dampers and louvers. A pressure tight housing contains a movable vane which is sealed to the sides of the pressure chamber by means of a low friction gasket. Inlets into the chamber on opposing sides of the vane allow a controller to produce a pressure differential across the vane. The vane will move, in response to the pressure differential, in either direction. A shaft is connected to the vane and the vane acts like a lever to rotate the shaft as the vane is moved by fluid pressure. The torque produced by the actuator assembly is primarily dependent upon the applied fluid pressure.

Hydraulic rotary vane actuators have the ability to handle large amounts of fluid and dynamic motions, exhibiting also qualities of durability and compactness. Pneumatic vane actuators use plant air pressure as the motive force. Both types generally have few moving parts and require little regular maintenance. A variety of typical automation accessories and options are available to customize a unit for a particular application.

Sunday, January 29, 2017

Pneumatic Vane Actuators Can Now Be Used in Foodservice Wash-down Applications

Kinetrol Blueline Foodservice Actuator
Kinetrol Blueline Foodservice Actuator
(Double-acting)

Finally, food and beverage processing companies can take advantage of the long-life and headache-free performance of Kinetrol vane actuators.

Kinetrol USA has officially introduced it's "Blueline" Series of pneumatic vane actuators for use in foodservice and beverage processing. The actuators are intended to be installed in areas where harsh chemical wash-down is required. These areas are very tough on most types of pneumatic actuators because the caustic or acidic chemicals used in cleaning adversely effect the actuator. All stainless steel actuators are an alternative, but they are prohibitively expensive. Kinetrol's Blueline Series provides a very economical option.

Kinetrol Blueline Foodservice Actuator
Kinetrol Blueline Actuator
(Spring-return)
Blueline Actuators are permitted for use in contact with food in compliance with the Federal Food, Drug and Cosmetic Act (FDA) and all applicable regulations, including 21 CR 175.300 (Code of Federal Regulations). The new actuator has an applied coating that meets with the FDA's allowance whereby "Resinous and polymeric coatings may be safely used as the food-contact surface of articles intended for use in producing, manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food ...".

The Blueline Series provides food and beverage processors all the time-proven benefits of the Kinetrol PLUS provides an affordable option for tough chemical wash-down areas. 

Kinetrol Blueline Features:
  • Very good resistance to "caustic wash-down" procedures as typically performed in the food industry.
  • Very good resistance to corrosion In salt laden environments.
  • Very good non-stick properties.
For more information, contact Kinetrol at 972-447-9443.

Wednesday, January 25, 2017

More Kinetrol Vane Actuators Hard at Work!

Here is a another short video of Kinetrol pneumatic vane actuators taking on some of the toughest industrial valve and damper applications.

Kinetrol engineered the first rotary vane actuators in 1958. The rotary design is based upon a single moving part which eliminates additional parts required to convert linear motion to rotary motion. This simple and innovative design provides a highly accurate and extremely reliable actuator for operating valves, drives and dampers, and is perfectly suited for the most demanding process control control applications.

For more information visit http://www.kinetrolusa.com or call 972-447-9443.


Monday, January 9, 2017

Rotary Vane Actuators for Corrosive Marine Environments: The Right Choice

Vane Actuators for Corrosive Marine Environments
Corrosive marine environments present problems for
valve actuators.
Corrosive marine environments such as offshore oil rigs, shipyards, and maritime facilities present special challenges for pneumatic actuators. Proper selection of actuator design is important for long, trouble-free life. Salt-laden dust and high humidity take a harsh toll on the internal and external parts of any industrial equipment if not properly designed and protected. For example, rack & pinion and scotch-yoke actuators are particularly susceptible because of the relative ease of penetrating the actuator and affecting their critical components, such as metallic gears and coil springs. Spring-return rack & pinion and scotch-yoke actuators further complicate the issue because they require the intake and venting of ambient air, along with any contaminants in the air.

Rotary vane actuators, (such as Kinetrol) provide strong immunity to internal corrosion. First, they have no internal gears or springs to corrode. Second, the internal surfaces are coated with a very durable, epoxy enamel finish and all internal hardware is made from stainless steel. Additionally, the “wiping” action of the vane and lip-seals provide a self-cleaning effect that prevents corrosion in the working areas. Finally, unlike rack & pinion and scotch-yoke actuators whose coil springs are bathed in ambient air, (Kinetrol) vane actuators use externally mounted clock type springs that are 100% sealed from ambient air/gasses and are unaffected by corrosive atmospheres.

For any application where corrosion is a problem, such as those in offshore platforms or other marine facilities, engineers should strongly consider rotary vane actuators as the preferred choice for any quarter-turn valve application.

The video below illustrates the difference in construction in actuator types and illustrates the inherent advantages of vane style actuators: