Page 4 - Exlar - Electric servo actuators for process control

Power Utility Proven Solutions

Balance of Plant Steam Turbines
Exlar actuators are the perfect choice for Turbine engineers have utilized the Exlar
power plants of all types that are advantage for years by replacing their
seeking the best heat rate or efficiency. hydraulic actuators in governor valve
Replacement of high maintenance control applications with Exlar’s patented
traditional electric or hydraulic actuators roller screw actuators. Advantages
is one place to start. include improved frequency control,
faster start-up, less maintenance and
A few examples include injection spray
valve actuators, pressure control the elimination of hydraulic oil and all of
actuators, boiler bypass and soot its nuances such as filters and pumps.
blower actuators. Many of these valves Exlar’s capable actuator lines offer linear
need to operate at low flow rates. forces up to 40,000 lbs.
Achieving a fast response to small In addition to the replacement of the
signals with the required precision is main governor actuator, Exlar electric
difficult when using conventional actuators are also used for pilot valve
actuator technologies. With the high applications where the replacement of
stiffness and precise closed loop the main hydraulic is not feasible. With
feedback available with an Exlar this application the effects of friction and
actuator, control of high pressure hydraulic reaction forces acting on the
differentials down to the smallest flow spool valve are greatly reduced, leading
rate is customary. Exlar also employs to increased sensitivity. With the reduced
valve seat technology to assure a tight dead band, the high static and dynamic
shutoff for retrofitted valves as well as control accuracy can be better than
new installations. With cycle counts in 0.02 percent.
the hundreds of millions, the life of an Exlar is pleased to work with all turbine
Exlar actuator is peerless. OEMs and turbine retrofitters.

4 EXLAR Process Industry Technology