Function and configurationThe valve type DR5DP is a 3-way direct operated pressure reducing valve with a pressure relief function on the secondary side.It is used to reduce the system pressure. The se...
Product Detail
Function and configuration
The valve type DR5DP is a 3-way direct operated pressure reducing valve with a pressure relief function on the secondary side.
It is used to reduce the system pressure. The secondary pressure is set by the pressure adjustment element (4).
At static position, the valve is normally open and the pressure fluid flows unhindered from port P to port A. The pressure in port A acts at the spool area opposite to the compression spring (3) via the control line (6) and the spray nozzle(7). When the pressure in port A get the value setting at compression spring (3), the control spool (2) moves into the control position and keeps the setting pressure in port A constant. The internal control oil is taken from port A, or from external by port X. If the pressure in port A still increases due to external forces on the actuator, the control spool (2) moves still further towards the compression spring (3).This causes a flow path to be opened via control land(8) on the control spool (2). Sufficient fluid then flows back to tank to prevent any further pressure rise.
Fluid in spring chamber always drained to tank externally via port Y. For free return flow from port A to port P an optional check valve(5) can be fitted.
Symbols
Ordering code
Technical data
| Fluid | Mineral oil suitable for NBR and FKM seal | |
| Phosphate ester for FKM seal | ||
| Fluid temperature range ℃ | -30 to +80(NBR seal) | |
| -20 to +80(FKM seal) | ||
| Viscosity range m㎡/s | 10 to 800 | |
| Degree of contamination | Maximum permissible degree of fluid contamination: Class 9. NAS 1638 or 20/18/15, ISO4406 | |
| Max.operating pressure | Port P bar | 315 |
| Max.secondary pressure | Port A bar | 25; 75; 150; 210;315(without check valve) |
| Max.backing pressure | PortT(Y) bar | 60 |
| Max.flow-rate L/min | 15 | |
| Weight kg | Approx.1.4 | |
Characteristic curves(Measured at oil =40°C +5°C, using HLP46)
PAmin-Q Characteristic curve shows the flow-rate in relation to the adjustable min. pressure rating from P to A.
For instance:pressure is 25 bar and flow-rate is 10L/min,adjusts the pressure of port A to 20bar,when the secondary pressure increases to 23bar,the flow-rate trends to zero.
Unit dimensions
