DIRECT OPERATED PRESSURE REDUCING VALVE TYPE DR5DP Size 5 Direct operated pressure reducing valve DR5DP is used to limit secondary pressure. It may be mounted in a hydraulic system in any position. Pressure reducing valves consists basically of the housing 1, control spool 2, pressure springs 3, setting element 4 and optional check valve 5. A control element is the spool 2, which is held in neutral position in the housing 1 by the springs 3. In neutral position the valve is open. Oil flows from port P through the housing to port A. At the same time pressure in port A affects the spool surface opposite the springs via control line 6. The control line 6 made in the moveable spool 2 is closed by the plug 7. If pressure at port A exceeds the value set at the spring, the spool 2 moves and reduces the flow from P to A. A check valve can be fitted in order to allow free return flow from port A to P. TECHNICAL DATA Hydraulic fluid Mineral oil or phosphate ester Nominal fluid viscosity Viscosity range Optimum working temperature( fluid in a tank ) Fluid temperature range Required fluid filtration Recommended fluid filtration Backpressure pressure in port Y ( T ) Maximum flow rate

OVERALL DIMENSIONS 2 - Adjustment by sleeve with internal hexagon = 2 3 - Adjustment by lockable handknob = 3 4 - Sealing ring - o-ring 7 x 1.5 at ports P, A, Y (T), X (B) Admissible surface roughness and flatness deviation for a subplate face.

PERFORMANCE CURVES, Pressure difference curve at inlet and outlet of the valve for particular pressure rate in relation to flow rate. Pressure loss curve at flow through a built-in check valve pressure set p d 1.0 MPa pressure set p > 1.0 MPa Secondary pressure increase curve for pressure set at flow decreasing to zero

HOW TO ORDER Orders coded in the way showed below should be forwarded to the manufacturer. Adjustment method Hand knob Sleeve with internal hexagon Lockable hand knob Further requirements in clear text ( to be agreed upon with the manufacturer ) Series number Fluids on mineral oil base = with no code Fluids on phosphate-ester base = V 20 = 20 ( 20 - 29 ) - installation and connection dimensions remain unchanged Maximum secondary pressure max max max max Check valve With check valve Without check valve Pilot supply and drain Pilot suply internal, drain external Pilot supply external, drain external...

1 - Mounting face of valve 2 - Recess in subplate face 3 - Mounting bolts - M5x50-8.8 PN - 87/M-82302 ( DIN 912 ) - 4 pcs ; Tightening torque = 9 Nm Note : Subplate and fixing bolts have to be ordered separately Graphical symbol Internal pilot supply External pilot drain without check valve External pilot supply Internal pilot drain with check valve