초록 ▼

A dual-spool hydraulic directional valve for controlling the motion of a hydraulic cylinder or similar device. The dual-spool hydraulic directional valve of the present invention is less costly to manufacture, may be more easily repaired, and is more resistant to contamination than current hydraulic

A dual-spool hydraulic directional valve for controlling the motion of a hydraulic cylinder or similar device. The dual-spool hydraulic directional valve of the present invention is less costly to manufacture, may be more easily repaired, and is more resistant to contamination than current hydraulic directional valves. The dual-spool hydraulic directional valve of the present invention is particularly suited to applications where the valve is not required to hold a load. The valve of the present invention uses two valve spools, with each valve spool controlling flow of hydraulic fluid through a particular port or ports. The valve spools work independently from one another, therefore, the slight leakage of hydraulic fluid from one valve spool to the other will not markedly affect the operation of the valve. In a preferred embodiment of the valve, a lever is utilized to shift the positions of the respective valve spools, although other means, such as electronic solenoids may also be used.

대표청구항 ▼

1. A hydraulic directional valve, said valve comprising:a valve body; a supply passageway in said valve body; a return passageway in said valve body; a pair of outlet ports, one port for directing pressurized hydraulic fluid from said valve body to a hydraulic device while the other port is receivin

1. A hydraulic directional valve, said valve comprising:a valve body; a supply passageway in said valve body; a return passageway in said valve body; a pair of outlet ports, one port for directing pressurized hydraulic fluid from said valve body to a hydraulic device while the other port is receiving pressurized hydraulic fluid from said hydraulic device; a first bore in said valve body, said first bore connecting one of said outlet ports to said supply and return passageways; a second bore in said valve body, said second bore connecting the other of said outlet ports to said supply and return passageways; a first valve spool located in said first bore and a second valve spool located in said second bore, a portion of each of said valve spools of lesser outer dimension than the remainder thereof to allow the passage of hydraulic fluid; and a shifting apparatus for causing a change of position of said valve spools, such that as one of said valve spools is inserted into its bore, the other of said valve spools is simultaneously withdrawn from its bore.