Pressure Valves
Pressure reducing valves, mechanical
- Selection criteria
- Frequently asked questions
- Pressure reducing valves, proportional
- Pressure relief valves, mechanical
Mechanical pressure reducing valves from Bosch Rexroth hold the pressure in a downstream part of the circuit at a spring-set value, independent of the higher supply pressure. They work without electrical control, for example for clamping and holding circuits that run at a lower pressure than the main system.
The largest group are ZDR sandwich plate valves in NG 6 and NG 10, which are mounted between subplate and directional valve and reduce the pressure for exactly one actuator, complemented by Z3DR 3-way sandwich plates. For subplate mounting there are the DR10, DR20 and DR30 series and the 3DR10 and 3DR16 3-way valves, as well as DRC series valves. Pressure ratings range from 25 to 315 bar.
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Buying guide
How to choose Pressure reducing valves, mechanical
What matters when choosing: properties, comparison and typical applications.
Selection criteria
| Criterion | Options | What to look for |
|---|---|---|
| Design | sandwich plate (ZDR, Z3DR), subplate mounting (DR, 3DR), DRC | The sandwich plate reduces the pressure only for the directional valve above it, without extra piping. |
| Number of ways | 2-way (ZDR, DR), 3-way (Z3DR, 3DR) | 3-way valves additionally relieve excess actuator pressure to tank. |
| Size | NG 6 and NG 10 (ZDR), DR10 to DR30, 3DR10 and 3DR16 | The digits after the code give the size, for example ZDR6 or DR20. |
| Pressure rating | 25 to 315 bar, coded in the type designation, e.g. /100 | The pressure rating is the highest adjustable outlet pressure. Choose the next rating above the required pressure. |
Frequently asked questions
- What is a pressure reducing valve used for?
- When part of the system is to work at a lower pressure than the pump delivers, for example clamping cylinders, control circuits or sensitive consumers.
- What is the advantage of the ZDR sandwich plate?
- It is fitted into the valve stack under the directional valve and reduces the pressure only for this actuator. Separate lines or an additional manifold are not needed.
- Mechanical or proportional?
- Mechanical valves are sufficient when the reduced pressure stays fixed. If it is to be changed by the machine control during operation, proportional pressure reducing valves are the right choice.