Pressure Valves
Pressure relief valves, proportional
Proportional pressure relief valves from Bosch Rexroth limit the system pressure to a value that is set steplessly by an electrical signal. This allows pressure profiles and adapting the maximum pressure to the load case during operation, without adjusting the valve by hand.
Direct operated valves such as DBET and DBETE cover small flow rates and often serve as pilot valves, pilot operated valves of the DBE, DBEM and DBEME series are designed for larger flows. An additional E in the type code, as in DBEE, DBEME or DBETE, stands for integrated electronics. Sandwich plate valves ZDBE and ZDBEE protect individual ports of a directional valve. Sizes range from NG 6 to NG 20, pressure ratings up to 500 bar.
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Buying guide
How to choose Pressure relief valves, proportional
What matters when choosing: properties, comparison and typical applications.
Selection criteria
| Criterion | Options | What to look for |
|---|---|---|
| Operating principle | direct operated (DBET, DBETE), pilot operated (DBE, DBEM, DBEME, DBEE) | Direct operated for small flows, pilot operated for large flows. |
| Electronics | external amplifier or integrated electronics (E in the type code) | Valves without integrated electronics need a matching valve amplifier. |
| Design | subplate mounting, sandwich plate (ZDBE, ZDBEE) | The sandwich plate sits under a directional valve and limits the pressure of individual ports. |
| Pressure rating | up to 500 bar, coded in the type designation, e.g. /315 | The pressure rating is the highest adjustable pressure. |
| Seal and voltage | NBR or FKM, 24 V DC solenoid | FKM for higher temperatures and special fluids. |
Frequently asked questions
- When is a proportional relief valve better than a mechanical one?
- When the maximum pressure has to change during operation, for example for load-dependent pressure profiles, a low standby pressure or remote adjustment from the machine control. One proportional valve then replaces several fixed-setting valves.
- Do I need a separate valve amplifier?
- For valves without integrated electronics, yes, they are driven by an external amplifier. Types with the E suffix such as DBEE, DBEME or DBETE carry the electronics on the valve and receive the setpoint directly.
- What does the number after the slash mean?
- It is the pressure rating, the highest adjustable pressure in bar, for example /315 for 315 bar.