Anti-surge Valve Actuators
Fast-acting protection against surge
Our industry-leading anti-surge valve actuators are one of the fastest & most reliable SIL-3 actuator systems that integrate with all control valves.
In case of an emergency, Cowan’s Anti-Surge Valve Actuators are designed to open the control valve as fast as 0.5 seconds and with a dead-band of 0.3 seconds.
In simple terms, surge in a compressor is the phenomenon that occurs when the flow through the entire compressor is reversed intermittently.
It is critical to avoid this phenomenon from happening since it is catastrophic for the integrity of the compressor as it will severely damage it. to prevent surges from happening, systems normally use anti-surge valves.
For such critical operation, the valve must be completed with controllers that use the suction and discharge pressure and temperatures to determine the flow at which the condition of surge will occur.
It is crucial for such valves to be operated by actuators that can achieve extremely fast stroking times, high frequency of operation, minimal dead time and overshoot.
Depending on the availability and reliability of the power supplies sources of your application, Cowan Dynamics has developed solutions within our product lines of Pneumatic and Electro-hydraulic actuators that allow opening times as fast as 0.5 secs, dead time of 0.3 seconds and an overshoot of 0.4 of 1% of the stroke.
Our team of technical experts can assist you to select the best solution for your application.
Cowan’s Anti-surge Valve Actuators are Engineered to meet the Most Challenging Environments.
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Pilot Valves
Pilot Valves
Position Transducer
Linkage-less connection to the positioner
Volume Booster
Volume Booster
Fail system
Solenoid valve
Anti-rotation Device
Pnuematic Anti-Surge Valve Actuator System
Our pneumatic actuator can be installed on all anti-surge valves. The system is engineered with a volume booster for fast-acting actuation, integrates with our reliable AT Series actuator, and integrated patented transducer technology (no linkage arm required for position feedback). Learn more about the AT Series
Pneumatic power supply
Remote electro-pneumatic controls
Fast stroke times 0.5 secs
Dead time 0.3 seconds
Pneumatic controls
High thrusts up to 425,000 lbs
Immediate failure actions
Overshoot of 0.4 of 1% of the stroke
Electro-hydraulic Anti-Surge Valve Actuator
Our electro-hydraulic actuator can be installed on all linear anti-surge valves. The E2H packs high performance and accuracy into the smallest possible installation envelope. Learn more about the E2H Series
Electric power supply
Local and remote controls, Programable PLC
Fast stroke times 0.5 secs
Dead-band adjustable down to 0.1% of stroke
Electro-Hydraulic controls
Thrusts up to 588,000.00 lbs
Immediate failure actions
Low power consumption
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Easy To Use Display
The large, easy to use touch screen display makes it easy for quick setup and operation. The software provides logging of real-time valve performance analysis.
Compact Design
All in one design. No need for separate hydraulic power units and hoses.
Versatile Modes
The E2H provides Fail Last, Fail Close, and Fail Open modes. It also has the ability to be mounted in horizontal and vertical positions.
Linear Valve Actuator
The linear valve actuator offers up to 500,000 Lbf of Thrust.