These valves are classified according to the function, operation method, and spring arrangement. The operation method is classified into: manual, mechanical, hydraulic, solenoid-operated, electro-hydraulic, and…
Category: Directional Control Valves
The directional control valves in hydraulic systems must work such that when the spools are in a neutral position, the fluid flow patterns meet the…
The port count indicates the number of connectable lines, and the position count indicates the number of change- overs in the directional control valves. Table…
The four-way flapper-nozzle valve has two identical hydraulic circuits, one supplies flow and pressure to one side of an actuator, the other circuit supplies the…
The flapper-nozzle valve has certain mechanical design advantages mainly the simpler construction and the feature of no close-clearance sliding parts as compared to the spool-type…
The two-way valve is merely a throttling valve having one variable-area orifice. When used in conjunction with a constant-flow source, the two-way valve can be…
The three-way control valve uses only one control pressure line to the actuator with the normal pressure supply line and a drain or return line.…
When a valve is designed to use a constant-flow source of fluid, the valve does not have its cont.rolling edges covering their corresponding port edges.…
The figure above shows a hydraulic sliding-spool valve. The piston inside the valve slides back and forth to block and release ports in the housing.…
In an open-center sliding spool directional control valve, the spool is designed to pass all flows on all its passages when the valve is centered.…