Cartridge Valves - Pressure Control Valves - Pressure Reducing and Relieving

MHDRDB

RE18318-55-01(2023-11-24)
Description

Initially, flow passes freely from 2 to 1. When the pressure at 1 exceeds the pressure setting, the valve acts to restrict input flow at 2. This increases the pressure drop through the valve and maintains consistent pressure at 1. The spring chamber is drained at 3 to prevent a build-up of back-pressure against the spool. Additionally, if pressure at 1 rises above the pressure setting, flow is relieved to 3 until the setting is re-attained. An undesirable increase in pressure in main port 1 is additionaly prevented by lifting the spring plate off the control spool. Tank pressure is additional to the spring setting.

Note: The valves are not provided with any surface protection.

RE18318-55-02(2023-11-24)
General
Weight:
  • 0.17 kg (0.37 lbs)
Installation position:
  • Any
Fluid Temperature:
  • -20 to 80 (-4 to 176)
Hydraulic
Max. operating pressure port 2:
  • 420 bar (6090 psi)
Max. control pressure port 1:
  • 35, 40 bar (508, 580 psi)
Max. tank pressure port 3:
  • 30 bar (435 psi)
Max. flow:
  • 15 l/min. (4 gpm)
Fluid temperature range:
  • -20 to 100 °C (-4 to 212 °F) for FKM
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of 10 to 800 mm²/s (cSt):
Installation torque:
  • 54 - 66 (40 - 49 ft-lbs)
Filtration:
  • Class 20/18/15 ISO 4406
Special cavity:
  • R/LA see page RE 18325-75
Load cycles:
  • 2 million
RE18318-55-order(2023-11-24)
RE18318-55-03(2023-11-24)
RE18318-55-dim(2023-11-24)
  • Pressure reducing and relieving direct acting spool type