Series – 3-Way Pressure Reducing Valves

Full-flow secondary pressure relief

Featuring a further redesign of the size 2 ... 4 three-way pressure reducing cartridges, all of our 3-way pressure-reducing valves are now available in a new, slim design with proportional or mechanical adjustment. The versatile 3-way pressure-reducing valves are high-performance pressure-reducing valves and are available as screw-in cartridges with an M27x2 or 3/4-16 UNF mounting thread, and as ISO size 3 and 5 sandwich valves. These valves guarantee high stability combined with low losses.

Symbols / Functional Overview

Mechanical operation

DDRB-7M…

DDRA-7L…

SDDRA-7L-P…

SDDRA-7L-AZR…

Actuation by means of proportional solenoids

DRVSA-7P…

SDRVSA-7…-P…

SDRVSA-7…-AZR…

Functions

  • Direct acting or two-stage 3-way pressure reducing valves
  • Proportionally or mechanicallyadjustable
  • Function in port P or A (Sandwich)
  • Available with pipe-threaded body

Your Benefits

  • Simple system integration thanks to high functional stability
  • Secondary pressure relief for full nominal flow rate
  • Flexibility through screw-in cartridge and sandwich designs
  • Long service life with no need for time-consuming maintenance work

Important Features

  • Optimum characteristic curves
  • Low performance loss
  • Excellent stability over the whole pressure and flow range
  • Simple and slim design
  • External pilot oil drain (proportional models)

Technical Data

Mechanical Actuation

Nominal Sizes DDRB-7M…
DDRA-7L…
NG6
SDDRA-7…
NG10
SDDRA-7…
Max. operating
pressure pmax 
250 / 315 bar 315 bar 315 bar 
Max. flow
rate Qmax. 
20 / 70 l/min 60 l/min  70 l/min 
Nominal pressures 30 bar, 60 bar, 100 bar, 160 bar, 250 bar
Design  Direct acting   Direct acting Direct acting
Cavity / Interface AM as  per Bucher standard
DL as per ISO
as per ISO
4401-03-02
as per ISO
4401-05-04
Mounting method  3/4-16 UNF
M27 x 2
4x M5 cylinder-
head screws
4x M6 cylinder-
head screws
Data sheet number  400-P-260501-E
400-P-260701-E
400-P-317101-E 400-P-326101-E

 

Proportional Solenoid Actuation

Nominal Sizes Cartridge
DRVSA-7P…
NG6
SDRVSA-7…
NG10
SDRVSA-7…
Max. operating
pressure pmax 
250 / 315 bar 315 bar 315 bar
Max. flow
rate Qmax. 
20 / 70 l/min 60 l/min  70 l/min 
Nominal pressures 100 bar, 160 bar, 250 bar, 350 bar
Design  Seated pilot  Seated pilot Seated pilot
Cavity / Interface DL as per ISO
7789-27-09-0-07
as per ISO
4401-03-02 
as per ISO
4401-05-04 
Mounting method  M27 x 2 4x M5 cylinder-head screws 4x M6 cylinder-head screws
Data sheet number  400-P-591101-E 400-P-595102-E 400-P-596101-E

Applications

These 3-way pressure reducingcartridges are predominantly used inmobile and stationary applicationswhere reducing a system pressure andproviding full-flow secondary pressurerelief are of the greatest importance.

Thanks to their low leakage, these directacting 3-way pressure reducingcartridges are ideally suited to systemswith accumulators.