RE 18321-87/07.2017, Bosch Rexroth Oil Control S.p.A.
Description
The valve delivers priority flow, from 0 to max. available, on
demand to port 4, while compensating for load changes
downstream. In neutral, all input flow at 3 is given to the
priority port 4. Pressure at 4 is applied to the spool against
a spring force so that increasing pressure causes increasing
by-pass of input flow to port 2. Load sense pressure at port
1, obtained between the downstream control and the load,
assists the spring, and moves the spool back toward
supplying priority flow. Comparison between priority outlet
and LS pressure seeks a constant differential pressure over
the control valve. As load and flow control change, the
priority flow is increased or decreased to satisfy the
demand establishing that differential.
Logic element, pressure compensator
with static load sense
Common cavity, Size 12
RE 18321-87
Edition: 07.2017
Replaces: 03.2016VRLA-12A-S 04.84.09.00.57 - Z
Technical data
Max. operating pressure 350 bar (5000 psi)
Max. inlet flow 100 l/min. (26 gpm)
Max. priority flow 80 l/min. (21 gpm)
Fluid temperature range -30 to 100 °C (-22 to 212 °F)
Installation torque 81 - 95 Nm (60 - 70 ft-lbs)
Weight 0.32 kg (0.71 lbs)
MTTFD 150 years see RE 18350-51
Cavity CA-12A-4N (see data sheet 18325-70)
Lines bodies and standard
assemblies
Please refer to section “Hydraulic
integrated circuit” or consult factory
Seal kit
1)
Code: RG12A4010530100
material no: R930001660
Fluids Mineral-based or synthetics with
lubricating properties
at viscosities of 10 to 500 mm
2
/s (cSt)
Recommended degree of
fluid contamination
Nominal value max. 10µm (NAS 8) /
ISO 4406 19/17/14
Installation No restrictions
Other Technical Data See data sheet 18350-50
1) Only external seals for 10 valves
Characteristic curve
Flow - Q
Flow - QPressure - Δp
2
Bosch Rexroth Oil Control S.p.A., RE 18321-87/07.2017
Bosch Rexroth Oil Control S.p.A.
Via Leonardo da Vinci 5
P.O. Box no. 5
41015 Nonantola – Modena, Italy
Tel. +39 059 887 611
Fax +39 059 547 848
compact-hydraulics-cv@boschrexroth.com
www.boschrexroth.com/compacthydraulics
© This document, as well as the data, specications and other information set
forth in it, are the exclusive property of Bosch Rexroth Oil Control S.p.a.. It
may not be reproduced or given to third parties without its consent. The data
specied above only serve to describe the product. No statements concerning
a certain condition or suitability for a certain application can be derived from
our information. The information given does not release the user from the
obligation of own judgment and verication. It must be remembered that our
products are subject to a natural process of wear and aging. Subject to change.
VRLA-12A-S | Logic element, pressure compensator
Dimensions [mm (inches)]
Ordering code
Dimensions
Logic element, pressure compensator with
static load sense
Series 0/A to L
unchanged performances and dimensions
Version and options standard
SPRINGS
Bias spring
bar (psi)
05 5.5 (80) ± 20%
57 Common cavity, Size 12 10 10 (145) ± 15%
Preferred types
04.84.09.00 57 Z 00 *
Type Material number
048409005705000 R930008062
048409005710000 R930001081
Type Material number
