MARSHALLTOWN, IOWA, April 2001 . . . . . Fisher Controls International LLC announces the introduction of the Type 585C Sliding Stem Piston Actuator Family. The 585C presents a simplified, uniform family of linear piston actuators, using a single Type number, product bulletin and instruction manual.

The new 585C is available in all standard sizes (25 to 130), with larger cylinder sizes available for special applications. Featuring a broad range of travel capabilities, strokes up to 8" are standard, with up to 24" available upon request.

The 585C also offers rugged construction and higher thrust than many previous piston actuators since the yokes have been upgraded from cast iron to ductile iron as standard material. With standard air supply capability up to 150 psig, the Type 585C can produce 25,000 pounds of thrust for those difficult valve unbalance problems. Special constructions can push thrust capability as high as 30,800 pounds. This actuator’s robust construction is further enhanced by NCF coated fasteners and zinc plated feedback arms that guard against corrosion.

The 585C actuator can be installed in any convenient orientation and fits all standard yoke and stem sizes. Universal NAMUR positioner mounting is standard on the entire family of 585C actuators. This design accommodates mounting of all current positioner designs, and gives excellent vibration resistance per ISA-S75.13. Also available for the 585C are many other accessories such as: the Type 304 cam operated limit switch assembly that can house from one to six snap-acting switches; the Type 377 trip valve which can provide fail-up, fail-down, or lock-in-last position when supply pressure falls below a specified limit; and the Type 4200 series electronic position transmitter to provide a signal proportional to valve stem position.

When fast and accurate control performance is important, the 585C has a number of features that makes it an outstanding contributor to bottom line performance. The double-acting construction allows quick, high frequency response to instrument signals. With the positioner applying pressure on both sides of the piston at all times, along with the relatively small volume of air within the cylinder, stiff, precise positioning accuracy is ensured. Coupled with the easily mounted FIELDVUE® digital valve controller or the 3600 Series positioner, control accuracy of 0.5% or better can be achieved.

For additional information on this subject, contact your local Fisher sales or sales-representative office, request the product bulletin 61.2:585C.

Fisher Controls International, Inc (www.gotofisher.com) is a global leader in the design, manufacture and application of final control systems. With manufacturing, sales, and service offices in North America, Europe, Asia, and Latin America, Fisher Controls provides an unmatched response to the needs of the energy and process industries. Fisher Controls is a member of the Emerson Process Management group of companies.

Emerson Process Management, a part of Emerson, is a world-leading supplier of control valves, regulators, transmitters, analyzers, process management systems, software, and related services. Its innovative PlantWeb® field-based architecture combines intelligent field devices with open communication standards and software to significantly enhance process and business performance.