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HYDRAULIC VALVES
VALVE INFORMATION
Hydraulic valves are manufactured in a variety of styles to function in different applications. Valves are used to
manipulate the flow of hydraulic fluid within a hydraulic circuit and are activated either mechanically or electronically.HYDRAULIC VALVES
Directional Control Valves are the most commonly used valve in a hydraulic system. Control valves direct the
flow of hydraulic fluid from the pump to the actuators or other sections of the hydraulic circuit. Control valves are
returned to their neutral state with a spring or held in each position with a detent mechanism. These valves are
generally used to control the direction of a hydraulic motor or cylinder; they can also perform other functions in a
circuit.Hydraulic directional control valves should be selected based upon both the size of the circuits and the compo-
nents, both upstream and downstream to the valve. Flow ratings should be based upon the highest possible flow
the valve will need to achieve.Valves are generally constructed from from a cast body or a sectional style that can
be assembled to meet the requirements of most applications. Most industrial solenoid-operated directional control
valves can be interchanged between many manufacturers due to industry standard mounting connections.Selector valves allow one power source to operate two unique circuits independently. They can also be used to
select two different flows or pressures to one circuit.SELECTOR VALVES
Relief Valves are made of cast iron or steel bodies with differential poppet or cartridge reliefs. These are adjust-
able, but generally come preset.Flow dividers split flow from one source and divide it proportionally between two or more components in a circuit.
These can be used to allow two cylinders to extend at the same time or two motors to rotate at the same speed.Ball valves are used in fluid power applications where a complete manual shut-off is required. The quarter turn
operation offers a quick way to isolate a portion of a system. Handles of the ball valve should be oriented to indi-
cate the internal position of the valves. When the handle is in-line with ports it is in the open position and when the
handle is perpendicular to the ports it is in the closed position.BALL VALVES
Pressure compensated flow controls adjust for pressure changes in the circuit and maintain a constant output flow.
A pressure compensated valve can also be used to prevent excessive heat build-up by maintaining an exhaust
flow.PRESSURE COMPENSATED
In-line valves can perform a variety of functions to help a system operate properly. Needle and flow controls adjust
the amount of fluid that can pass through the valves and are able to limit the speed of a cylinder or motor.In-line Flow Control Valves