Cartridge Valves - Load Holding Valves - Counterbalance - Counterbalance relief compensated

VBSP-25U-RS

RE18320-30-01(2023-11-02)
Description

When pressure at 2 rises above the spring bias pressure, the check seat is pushed away from the piston and flow is allowed from 2 to 1. When load pressure at 1 rises above the pressure setting (turn counterclockwise to increase setting - turn clockwise to decrease setting), the direct-acting, differential area relief function is activated and flow is relieved from 1 to 2. With pilot pressure at 3, the pressure setting is reduced in proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. The valve applies a balanced piston design allowing relief operation at the valve setting independent of back-pressure at 2. However, the piloted opening of the valve remains subject to additive pressure at port 2. Valve design prevents spring going solid and complete unscrewing during adjusting.

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

General:
Max. operating pressure:
  • 420 bar (6000 psi)
Max. flow:
  • 480 l/min (127 gpm)
Max. internal leakage¹):
  • 15 drops/min.
Fluid temperature range:
  • -30 to 100 °C (-22 to 212 °F)
Installation torque:
  • 475 - 500 Nm (352 - 370 ft-lbs)
Weight:
  • 1.7 kg (3.7 lbs)
MTTFD:
  • 150 years see RE 18350-51
Cavity:
  • SUN T-19A
Lines bodies and standard assemblies:
  • Please refer to section “Hydraulic integrated circuit” or consult factory
Adjustment:
  • according to ISO 4413 with sealed adjustment screw to prevent oil leakage during adjustment
Salt spray test:
  • 500h according to DIN EN ISO 9227:2017-07
Seal kit²):
  • Code: RG25U9020110100
  • material no: R930006268
Fluids:
  • Mineral-based or synthetics with lubricating properties at viscosities of 10 to 500 mm²/s (cSt)
Recommended degree of fluid contamination:
  • Nominal value max. 10µm (NAS 8) / ISO 4406 19/17/14
Installation position:
  • No restrictions
Other Technical Data:
  • See data sheet 18350-50
RE18320-30-02(2023-11-02)
RE18320-30-order(2023-11-02)
RE18320-30-dim(2023-11-02)