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Sliding Stem Actuators

 Electric Sliding Stem Actuators

An electric sliding stem actuator provides a stem force output for a variety of process applications by using electricity as the power source.

Baumann™ MV-1020 and VA-1020 Electronic Modulating Valve Actuators
Baumann™ MV-1020 and VA-1020 electronic modulating valve actuators feature state-of-the-art stepper motor technology to provide unrestricted, continuous modulation and exacting position control. Performance of these actuators rivals the power of our pneumatic diaphragm sliding-stem designs.
Baumann™ NV Electric Control Valve Series
The Baumann™ NV electric control valve series is specifically designed for Baumann sliding-stem control valves. It is used for temperature and humidity control for HVAC (hot and chilled water, steam, glycol, etc.), semiconductor manufacturing (clean rooms, make-up air handlers, recirculation air handlers, humidification, chillers, jackets, and glycol systems) and for many more industrial environments (textiles, food and beverage, and tire manufacturing).

Spring & Diaphragm Sliding Stem Actuators

Fisher® spring and diaphragm pneumatic actuators can be “direct-acting”, meaning that air to the diaphragm casing pushes the actuator stem downward. This “air-to-close” action compresses the spring, which in turn pushes the actuator stem back up when the supply pressure is decreased or lost.

Additionally, spring and diaphragm pneumatic actuators can be “reverse-acting”, meaning that air to the diaphragm casing causes the actuator stem to move upward. This “air-to-open” action compresses the spring, which in turn causes the actuator stem to move downward when supply pressure is decreased. This is the most common type of diaphragm actuator sold, as the spring action results in a valve “fail-closed” position upon loss of supply air.

Fisher® 3024C Compact Spring Sliding Stem Actuator
Instruction Manual Product Bulletin
The Fisher® 3024C actuator is a compact spring opposed pneumatic diaphragm actuator incorporating a cast yoke mounting and is suitable for general purpose actuation of globe valves. It will position the valve plug in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm. The 3024C actuator can be assembled as either direct-acting or reverse-acting and provides dependable and on-off or throttling operation of automatic control valves.
Fisher® 3025 Sliding Stem Actuators (Spring Opposed)
Product Bulletin
Fisher® 3025 Size P460-200, P462 and P900 spring opposed diaphragm actuators position the valve plug in the valve body in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm. They can be specified as either direct, e.g. air-to-close, or reverse acting e.g. air-to-open. These actuators are designed to provide dependable on-off or throttling operation of automatic control valves.

 

Fisher® 657 and 667 Spring-Opposed Diaphragm Actuator
657-Sizes 30-76 and 87 Instruction Manual
657-Sizes 80 and 100 Instruction Manual
667-Sizes 30-76 and 87 Instruction Manual
667-80 and 100 Instruction Manual
Product Bulletin
Fisher® 657 and 667 spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm. Zero setting of the actuator is determined by the compression of the actuator spring. Span is set by both the actuator spring rate and the number of springs available. The 657 actuator is direct-acting; the 667 is reverse-acting. These actuators are designed to provide dependable on-off or throttling operation of automatic control valves.

Piston Sliding Stem Actuator

Fisher® linear piston actuators are powerful, double-acting actuators that provide accurate throttling or on-off operation for sliding-stem control valves. They cover a wide range of thrust and travel length requirements, up through 610 mm (24 inches).

Fisher®  585C Linear Piston Sliding Stem Actuator
Instruction Manual Product Bulletin
The Fisher® 585Clinear piston actuator is a powerful, double-acting actuator that provides accurate throttling or on-off operation for sliding-stem control valves.

The 585C piston actuator family is available in sizes 25 to 130 to cover a wide range of thrust and travel length requirements. It can be used with switching valves for on-off control, or with the DVC6000 Series digital valve controller or 3600 Series positioner for throttling applications.

The 585C has a wide range of supply pressure capabilities, up to 150 psig. As the 585C is double-acting, the positioner supplies air to both sides of the piston, resulting in stiff, precise movement and control.

The 585C piston actuator is also available in a long stroke version with travel capabilities up through 610 mm (24 inches).

Self Operated Sliding Stem Actuators

Fisher® self-operated actuators provide control for a wide variety of pressure regulation applications. Coupled with an easy-e® control valve, these actuators can be either self-operated (using process pressure as a signal), or remote-operated. Typical industrial applications include pressure control of water, steam, oil, gas, and other fluids.

Fisher® 1B Pump Governor Sliding Stem Actuator
Instruction Manual Product Bulletin
The Fisher® 1B pump governor actuator is used to maintain a constant discharge pressure on steam driven turbine or reciprocating pumps and for pressure reducing or pressure relief applications. Typical pump governor applications include fire pumps, boiler feedwater pumps, and industrial or refining pumps where the discharge medium is oil, steam, air, or other noncorrosive fluid.

The 1BR pump governor actuator is combined with a push-down-to-open valve for service as a relief governor. A relief governor is used to divert excess pump discharge to the suction side of the pump.

Fisher® 644 and 645 Self-Operated Sliding Stem Actuators
Instruction Manual Product Bulletin
Fisher® 644 and 645 actuators are used in combination with any of several sliding-stem valves to automatically control steam-driven boiler feedwater pumps (reciprocating or turbine). The 644 or 645 actuator, when used in combination with one of several push-down-to-close sliding-stem valves, forms a pump governor.

644 and 645 actuators may also be combined with push-down-to-open valves to be used as relief governors. Relief governors are used to divert excess pump discharge back to the suction side of the pump.

Fisher® 655 and 655R Diaphragm Sliding Stem Actuators
Instruction Manual Product Bulletin
Fisher® 655 and 655R diaphragm actuators, in combination with Fisher valves, provide control for a wide variety of pressure regulation applications. The 655 is used for pressure reduction service on push-down-to-close valves, and the 655R is primarily for pressure relief use on push-down-to-open valves. These actuators may be either self-operated or remote-loaded.

Manual Sliding Stem Actuators

Fisher® manual handwheel actuators are used in applications that require a throttling type of control valve that can be manually operated and set. Capable of giving precise manual throttling control, these actuators can be used on nearly all standard globe-style or angle-style valve body assemblies. A travel indicator on the actuator yoke can provide a visual indication of valve plug position.

Fisher® 1008 Manual Handwheel Sliding Stem Actuator
Instruction Manual Product Bulletin
The Fisher® 1008 manual handwheel actuator is used in applications that require a throttling type of control valve that can be manually operated and set. This actuator can be used on nearly all standard globe-style or angle-style control valve body assemblies. No special valve body adaptor is required for use with the 1008 actuator, so that future conversion from manual to automatic control can be accomplished at minimum cost.

The 1008 actuator is capable of giving precise manual throttling control. A travel indicator mounted on the actuator yoke provides a visual indication of valve plug position at all times. A dial type valve plug position indicator is also available as optional equipment.

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