Function and configurationPressure relief valves type DB..K.. are pilot operated pressure relief valves for installation in manifolds. They are used to limit the pressure in a hydraulic system. The sy...
Product Detail
Function and configuration
Pressure relief valves type DB..K.. are pilot operated pressure relief valves for installation in manifolds. They are used to limit the pressure in a hydraulic system. The system pressure is set via adjustment element (4). At static position, the valves are closed. Pressure in port A acts on the spool (1). Pressure fluid flows through orifice (2) to the spring loaded side of the spool (1) and through orifice (3) to the pilot poppet (6). If the pressure in port A rises beyond the value setting at spring (5), the pilot poppet (6) opens. Fluid can flow from the spring loaded side of spool (1), orifice (3), and channel (8) into port T(Y). The pressure drop moves spool (1) to open the connection from A to B, while the setting pressure at spring (5) is maintained. Pilot oil returns from the two spring chambers via port T(Y) externally.
Ordering code
Notes:
The pilot relief valves may have lower starting pressure and more flow, but have more internal leakage. If lower leakage is demanded, such as safety valve, it is recommended to choose direct operated pressure relief valves, DBD type.
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 bar | 315 |
| Max. back pressure Port Y bar | 250 |
| Max.adjustable pressure bar | 50;100;200;315 |
| Max.flow-rate L/min | To 400 |
| Weight kg | Approx.0.35 |
Characteristic curves(Measured at oil =40°C +5°C, using HLP46)
Unit dimensions
