Page 630 - Hydrover-hydraulic-integrated-circuits-catalogue

COMPONENTS

Counterbalance, standard guided poppet type

Common cavity, Size 08
RE 18320-01
Edition: 07.2021
VBSN-08AA 04.52.20 - X - 56 - Z Replaces: 01.2021

Technical data
Max. operating pressure 350 bar (5000 psi)
Max. flow 30 l/min (8 gpm)
Max. internal leakage 1) 5 drops/min.
Fluid temperature range -30 to 100 °C (-22 to 212 °F)
Installation torque 34 - 41 Nm (25 - 30 ft-lbs)
Weight 0.18 kg (0.4 lbs)
MTTFD 150 years see RE 18350-51
Cavity CA-08A-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 the Lines bodies and standard Please refer to section “Hydraulic
pressure setting, the direct-acting, relief function is activated assemblies integrated circuit” or consult factory
and flow is relieved from 1 to 2. With pilot pressure at 3, the Seal kit 2) Code: RG08A9010520100
pressure setting is reduced in proportion to the stated ratio material no: R901101592
of the valve, until fully open with free-flow from 1 to 2. The Fluids Mineral-based or synthetics with
spring chamber is drained to 2, and any back-pressure at 2 is lubricating properties
additive to the pressure setting in all functions. Valve design at viscosities of 10 to 500 mm /s (cSt)
2
prevents spring going solid and complete unscrewing during Recommended degree of Nominal value max. 10µm (NAS 8) /
adjusting. fluid 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 18320-01/07.2021, Bosch Rexroth Oil Control S.p.A.

630 General catalogue September 2023 edition