DR-50B Pilot Operated Pressure Reducing Valve Type

Functional, Section

Pressure valvestype DR are pilot operated pressure reducing valves, which are controlled from the secondary circuit. They basically consist of main valve (1) with main spool insert (3) and pilot valve (2) with pressure adjustment element..

At rest, the valves are open, fluid can freely pass from port B to port A via the main spool insert (3).

Pressure present in port A acts upon the bottom side of the main spool At the same time there is pressure acting on the ball(6) in the pilot valve ⑵ via the orifice ⑷ on the spring- loaded side of the main piston (3) and via the port (5).

Same it is acting on the ball (6) via the orifice (7), control line (8), check valve(9jand orifice (10). According to setting of spring (11), pressure builds up in front of the ball (6),

in port (5) and in spring chamber (12), holding the control piston (13) in the open position Fluid can freely flow from port B to port A via main spool insert (3), until the pressure in port A exceeds the value set at spring (11) and opens the ball (6).

The control piston (13) moves to dosing position.

The desired reduced pressure is achieved, when a balance between the pressure in port A and the pressure set at spring (11) is reached Pilot oil drain from spring chamber (14) to tank takes place externally via control line (15).

Free return flow from port A to B can be achieved by installing an optional check valve (16).

A pressure gauge connection (17) allows the reduced pressure in port A to be monitored

characteristic curves(measured at V=41mm2/s and t=50℃)

Unit dimensions: Valve for subplate mounting (Dimensions in mm)