The Kerry Actuator is a unique concept designed to join together the advantages of conventional electrical rams (compactness and easy installation) and the advantages of hydraulics (smooth linear motion, adjustability, safety, and reliability).

It incorporates, in one compact component, an electric motor (any type), a hydraulic pump enclosed in a sealed reservoir, flow, pressure and functional control valves, and a double acting heavy duty hydraulic
cylinder or rotary actuator
 
TECHNOLOGICAL FEATURES

1.  Single unit self-powered construction:
The whole hydraulic circuit (electric motor, pump, flow and pressure controls and cylinder) is contained in a single assembly which eliminates expensive engineering, installation, start-up and maintenance costs. Operating costs are also reduced since the unit motor operates only when rod motion is required.

2.  Modular stacked construction:
The design of most Kerry Actuators is such that all modular control components are assembled directly to the pump. This is an improvement on other comparable systems and is exclusive to the Kerry Actuator.

3.  Sealed hydraulic circuit:
The entire unit is sealed from the atmosphere. The design of our reservoir allows for changing hydraulic fluid volume on extension and retraction of the cylinder rod and for temperature changes. This important feature eliminates the entry of dirt and moisture into the system and renders a long maintenance free unit service life.

4.  Internal feeds to the cylinder:
In the B, E, K, and M series units, the fluid feed to both the rod and piston sides of the cylinder are effected internally, eliminating potential leakage points. In the JB, JE, JK, JM, Q, S (special) and KR series units there are one or two external fluid feed lines to the rod and piston sides of the cylinder, depending upon whether the unit is built with
an in-line or laterally mounted power unit.

5.  Electrical Control:
 An important feature of the Kerry Actuator design is the reverse rotation of the pumping unit. The obvious advantages are:
 
5.1 - There is no need for a directional control valve with its associated actuating solenoids. A simple electrical reversing motor starter allows for "3 wire" control of the actuator, eliminating expensive electrical engineering, relays, switches and numerous cables.

5.2 - The electric motor is normally stopped after each stroke. When the motor is signaled to stop, the cylinder rod is immediately and automatically locked in position by hydraulic locking valves. This can take place at any position in the unit stroke in both directions.

5.3 - With the Kerry Actuator system there is an obvious electrical power savings and a decrease in component wear when this system is compared with a standard typical hydraulic system, where the electric motor is continuously running, generating heat and wear in the system.

6.  Eliminate the need for hydraulic expertise by the user:
 This new concept of self-contained electro-hydraulic actuator allows the potential user to select from a standard range of Kerry Actuators without the necessity of complex calculations for power, oil flow, pressure, etc. The only requirements for selecting the correct Kerry Actuator would be to know the force, speed, stroke or
rotation mounting and motor construction required.

7.  Optional Accessories:

•  Mounting Fixtures: Trunion, Flange, Foot, Base, or Eye to Eye.
•  Adjustable Limit Switches
•  Position Indication: Potentiometer or Transducer
•  Rod Ends: Threaded, Male or Female Clevis, Plain or Spherical Eye.
•  Alarm Warning System: High Temperature, High Pressure, Low Pressure, etc.
•  Explosion Proof, Dirty Duty or Submersible Electrical Construction.
•  Fail Safe Construction.
•  Stainless Steel Rod.
•  Manual Overide Options.
•  Steel Rod Cover