Function and configurationThe pressure valve type 3DR16P is a pilot operated 3-way pressure reducing valve with pressure limitation in the secondary circuit. It is used for reducing pressure in a hydr...
Product Detail
Function and configuration
The pressure valve type 3DR16P is a pilot operated 3-way pressure reducing valve with pressure limitation in the secondary circuit. It is used for reducing pressure in a hydraulic system.
The pressure reducing valve consists mainly of main valve (1), control spool (2) and pilot control valve (3) with pressure adjustment element (10).
At static state, the valves are normally open, oil can flow free from port P to port A. The pressure in port A is applied through the channel (4) to the spool area opposite to the compression spring (9). At the same time pressure acts at the ball valve (7) within the pilot valve (3), via throttle orifice (6) and the channel (5). According to the setting value at the spring (11), pressure build up in front of the ball valve (7) and channel (5) which holds the control spool (2) in an open position. Oil freely flows from port P to A through control spool (2), until the pressure of port A exceeds the setting value at the spring (11), and then opens the ball valve (7), meanwhile the control spool (2) moves to the close position. The expected reducing pressure is achieved when a balance between the pressure in port A and the pressure setting value at the compression spring (11) is reached.
If the pressure in port A continuously increases due to external forces, the control spool (2) moves still further against the compression spring (9). Thus port A is connected to port T through the control lands (8) at the control spool (2). Enough pressure fluid flows to the tank to ensure that the pressure does not rise any further.
The pilot oil from the spring chamber (12) is always external through the control line (13) and port Y to the tank without back pressure.
A pressure gauge connection (14) makes it possible to monitor the reduced pressure in port A.
Type 3DR16P5-L7X/...
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 | |
| Nominal pressure bar | 315 | |
| Max.operating pressure | port P bar | 315 |
| Max.operating pressure | port A bar | 250 |
| Max.operating pressure | portY bar | Separate and at zero pressure to tank |
| Setting pressure | Min. bar | Dependent on the flow (see curves on page 04/06) |
| Max. bar | 50;100;200;250 | |
| Max.flow-rate L/min | 220 | |
| Weight kg | Approx.8.8 | |
Characteristic curves (Measured at oil =40°C +5°C, using HLP46)
Unit dimensions
