DR4 Reversing Valves

The DR4 is an hydraulically operated directional control valve for use with dualine or non-return systems.

PRODUCT CHARACTERISTICS

• Hydraulically controlled
• Working pressure adjustable from 40 to 350 bar
• Motion indicator with optional electrical monitoring

FUNCTION

The reversing valve’s switching pressure depends on the spring pressure, which can be set for installation. After the activation of all dual-line metering valves in the lubricating system, pressure is built up against a guide piston, which in turn acts on a rocker arm. If the force acting on the rocker arm is equal to the spring force, it moves into the other end position. This directs a control current towards one end of the piston, which determines the direction of flow. The piston moves, thereby freeing at the other end the passage to the tank. Accordingly the pump’s delivery flow is directed into the opposite line and the pressure is taken off the originally pressurized line back to the tank.

An electric switch, which is activated by means of a pin attached to the control piston in the direction of flow, is mounted on the reversing valve. When the switch is activated by the pin, either to open or close it, a signal is sent to the control to either stop the pump or start a switching interval.

On the DR4 valve (non-return system), the two pipelines do not return to the reversing valve but the reversal pressure is sufficient for the operation of all the measuring valves.

Technical Specs