Function and configurationType DBET(E)X proportional pressure relief valves are remote controlled (pilot) valves in conical seat design. They are used to limit system pressure. The valves are actuated...
Product Detail
Function and configuration
Type DBET(E)X proportional pressure relief valves are remote controlled (pilot) valves in conical seat design. They are used to limit system pressure. The valves are actuated by means of a proportional solenoid. The interior of the solenoid is connected to port T and is filled with pressure fluid. With these valves, the system pressure that needs to be limited can be infinitely adjusted by the valve amplifier electronics in relation to the solenoid current, at an oil flow < 1L that is as close as possible to constant.
Basic principle
Type DBETX proportional relief valves can adjust the system pressure, a setpoint is set in the trigger electronics. Based on this setpoint, the electronics control the solenoid coil (1) with regulated PWM (pulse-width-modulated) current. The proportional solenoid converts the current to a mechanical force, which acts on a main spring (2) by means of the armature plunger. An "additional" spring (5) between the cone (3) and the seat (4) contributes to stability and a minimal residual pressure. The spring force acting on the cone and the pressure in the valve seat balance one another at a constant oil flow (0.7...1L/min). The "pmax" pressure stage is determined by the cone and seating bore configuration.
The model DBETEX proportional relief valve is equipped with a built-in amplifier, and its function and design are the same as DBETX. A plug type proportional amplifier (6) is installed on the proportional electromagnet (1), and a seven pin plug (7) receives power and command signals.
Pressure limitation for maximum safety
If a fault occurs in the electronics, so that the solenoid current (Imax) would exceed its specified level in an uncontrolled manner, the pressure cannot rise above the level determined by the maximum spring force.
Symbols
Ordering code
Technical data
| General | |
| Construction | Poppet valve, direct drive |
| Connection type | Subplate, mounting hole configuration NG6 (ISO 4401-03-02-0-05) |
| Mounting position | Optional |
| Ambient temperature range ℃ | -20...+50 |
| Weight Kg | about 2.1 |
| Vibration resistance, test condition | Max. 25 g, shaken in 3 dimensions(24 h) |
| Hydraulic (measured with HLP 46, 0oil=40℃±5℃ | ) | |||||
| Pressure fluid | Hydraulic oil to DIN 51524...535, other fluids after prior consultation | |||||
| Viscosity range | recommended m㎡/s | 20...100 | ||||
| max.permitted m㎡/s | 10...800 | |||||
| Pressure fluid temperature range ℃ | -20...+80 | |||||
| Maximum permitted degree of contamination of pressure fluid Purity class to ISO 4406 (c) | Class 18/16/13 | |||||
| Direction of flow | See symbol | |||||
| Max. set pressure (at Q=1 L/min) bar | 50 | 80 | 180 | 250 | 315 | |
| Minimum pressure (at Q=1L/min) bar | 2 | 3 | 4 | 5 | 8 | |
| Max.working press bar | Port P:315 | |||||
| Port T:250 | ||||||
| Max.mechanical pressure limitation level, bar e.g.when solenoid current | > Imax | <55 | <85 | <186 | <258 | <325 | |
| Static/Dynamic | |
| Hysteresis % | ≤4 |
| Response time 100% signal change ms | o<60/0H<70 |
| Range of inversion % | n ≤3 |
| Electrical | |
| Cyclic duration factor % | 100 ED |
| Degree of protection | IP 65 to DIN 40050 and IEC 14434/5 |
| Solenoid connection | Plug-in connector to DIN EN 175301-803/ISO 4400 |
| Power | 24 VDCnom |
Valve with external trigger electronics
Unit dimensions
