Page 634 - Hydrover-hydraulic-integrated-circuits-catalogue

COMPONENTS

VBSN-12A
VBSN-12A

Counterbalance, standard poppet type

differential area

Common cavity, Size 12
RE 18320-03
Edition: 01.2021
VBSN-12A 04.52.28 - X - 57 - Z Replaces: 06.2019

Technical data
Max. operating pressure 350 bar (5000 psi)

Max. flow 120 l/min (32 gpm)
Max. internal leakage 1) 15 drops/min.
Fluid temperature range -30 to 100 °C (-22 to 212 °F)
Installation torque 81 - 95 Nm (60 - 70 ft-lbs)
Weight 0.39 kg (0.86 lbs)
MTTFD 150 years see RE 18350-51
Cavity CA-12A-3C (see data sheet 18325-70)
Adjustment according to ISO 4413 with sealed
adjustment screw to prevent oil
Description leakage during adjustment
When pressure at 2 rises above the spring bias pressure, Salt spray test 500h according to DIN EN ISO
the check seat is pushed away from the piston and flow is 9227:2017-07
allowed from 2 to 1. When load pressure at 1 rises above Lines bodies and standard Please refer to section “Hydraulic
the pressure setting, the direct-acting, differential area assemblies integrated circuit” or consult factory
relief function is activated and flow is relieved from 1 to 2. Seal kit 2) Code: RG12A9010520100
With pilot pressure at 3, the pressure setting is reduced in material no: R901111379
proportion to the stated ratio of the valve, until fully open Fluids Mineral-based or synthetics with
with free-flow from 1 to 2. The spring chamber is drained lubricating properties
to 2, and any back-pressure at 2 is additive to the pressure at viscosities of 10 to 500 mm /s (cSt)
2
setting in all functions. Valve design prevents spring going Recommended degree of Nominal value max. 10μm (NAS 8) /
solid and complete unscrewing during adjusting. fl uid contamination ISO 4406 19/17/14

Installation position No restrictions
Other Technical Data See data sheet 18350-50
Pressure setting: at least 1.3 times the load induced pressure and
maximum 1.5 times catalogue max nominal setting.
1) At 70% of pressure setting
2) Only external seals for 10 valves
Characteristic curve

Pressure Δp

Flow Q

RE 18320-03/01.2021, Bosch Rexroth Oil Control S.p.A.

634 General catalogue September 2023 edition