Hydraulic pilot operated four-way directional control valve

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hydraulic pilot operated four-way valve schematic
Hydraulic pilot operated four-way valve schematic

Hydraulic pilot operated four-way valve is used to control the hydraulic fluid flow direction by using a pilot pressure. In the figure above, if the pilot pressure on either spool side is pressurized by a hydraulic fluid pressure then the spool will be shifted. If the unit is a spring offset type, the spring trust will hold the spool in its normal position. The spool will be shifted to the other end by applying a pilot pressure. If the pilot pressure is removed, the spool will return to its normal position due to the thrust of spring. This kind of valve doesn’t have a detent-hold function so the valve will be in a shifted position as long as the pilot pressure exists. The figure above shows hydraulic pilot operated four-way valve schematic.

 

 

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