This document is the user manual of the pressure relief valve produced by Bucher Hydraulics GmbH. It details the function, features, specifications, installation methods, etc. of the product.
This datasheet provides the technical specifications for the Bucher Hydraulics pressure‑limiting valve of type A DF/A DH. It includes the pressure adjustment ranges, flow capacities, temperature limits, viscosity range and the dimensions of the valve body and its thread connections.
The document also lists the available thread sizes (SAE 1/2", 3/4" and 1"), optional integrated back‑pressure valve options, and ordering information such as part numbers and required accessories. This manual is written in German.
| Adjustment range | 10–350 bar (three pressure stages) |
|---|---|
| Opening pressure (RV) | 0–3 bar |
| Medium temperature range | -20 °C to +80 °C |
| Viscosity range | 10–300 mm²/s |
| Nominal flow (SAE 1/2") | 40 L/min |
| Nominal flow (SAE 3/4") | 80 L/min |
| Nominal flow (SAE 1") | 120 L/min |
The valve can be set from 10 to 350 bar in three pressure stages.
Thread connections are offered in SAE 1/2", SAE 3/4" and SAE 1" sizes.
Yes, an integrated back‑pressure valve (R) is possible when the valve is built with a thread connection.
The fluid temperature may range from –20 °C to +80 °C.