The Model EA81 is a hydraulic valve actuator with a linear stroke for proportional control of small valves that require return to normal position on power interruption. The permanently sealed oil-filled case contains a moveable hydraulic system. The electric pump/motor, powered continuously by the input supply voltage, generates fluid pressure opposed by the spring of the damper or valve linkage. The EA81 is available in two models, a 4-20mAdc input and a 135 Ohm slidewire input.
The control signal is compared to measured shaft position in the actuator controller circuit and the output generates proportional positioning of the valve shaft. The unit supplies a force of 150 pounds for a linear stroke and operates on 120Vac, 50/60 Hz. The linkage kit and extension, model AV-611, provides linkage to 1/2" to 1-1/4" valve sizes. The EA81 is compatible with the VB-7000 valves in this catalog.