2 Way Pilot Operated Directional Control Valves
Parker’s R04* series of directional valves are available both normally-open and normally-closed. Flow ranges up to 26 gpm and pressure rating of 6000 psi, these valves are used as a switching valve by sensing pressure in other parts of the circuit.
The R04*3 series valve is a 2 way, 2 position valve that is 3 ported. With port one (nose) of the valve the pilot port, main flow goes through ports 2 and 3. The spring chamber is ported to port three so care needs to be taken making sure this is the low pressure side of the circuit.
When a pilot signal is given at port one, pressure acts upon the spool lifting it against the spring and closing flow from port two to port three. Spring chamber is vented internally out port three. When the pilot signal is removed, the spring acts upon the spool forcing it open to allow flow from ports two to three. Switching pressures of 5 bar and 10 bar are available. This valve is also available in a normally closed configuration.
The R04*4 series valve is a 2 way, 2 position valve that is 4 ported. Like the R04*3 series of valves, this valve received the pilot signal at port 1, shifting the valve against the spring and closing flow from port two to port three. A fourth port is connected to the spring chamber allowing the oil to vent independently of pressure at port three.
The R04 series of valve are used as a high flow directional control valve or unloader valve. Typical markets include, but are not limited to: Aerial lift, fork lift, off-road earth moving contruction equipment, industrial special machinery, conveying systems.
The R04*3 series valve is a 2 way, 2 position valve that is 3 ported. With port one (nose) of the valve the pilot port, main flow goes through ports 2 and 3. The spring chamber is ported to port three so care needs to be taken making sure this is the low pressure side of the circuit.
When a pilot signal is given at port one, pressure acts upon the spool lifting it against the spring and closing flow from port two to port three. Spring chamber is vented internally out port three. When the pilot signal is removed, the spring acts upon the spool forcing it open to allow flow from ports two to three. Switching pressures of 5 bar and 10 bar are available. This valve is also available in a normally closed configuration.
The R04*4 series valve is a 2 way, 2 position valve that is 4 ported. Like the R04*3 series of valves, this valve received the pilot signal at port 1, shifting the valve against the spring and closing flow from port two to port three. A fourth port is connected to the spring chamber allowing the oil to vent independently of pressure at port three.
The R04 series of valve are used as a high flow directional control valve or unloader valve. Typical markets include, but are not limited to: Aerial lift, fork lift, off-road earth moving contruction equipment, industrial special machinery, conveying systems.
