Compact Directional Valves - Non-compensated and Post-compensated - Flangeable elements ED Series

EDM-VR

RE18301-40-01
Description

The secondary flangeable elements EDM-VR-__ can be interfaced and bolted on top of the A and B ports of the ED elements of the Directional Valve Assembly.

They incorporate two Cross Piloted Check Valves which allow free flow toward the A and B outlet ports, and lock in a leak free mode the flow returning from the actuator, until sufficient pilot pressure is built up in the opposite line and the check valve is opened.

Depending on the version selected (AB, or 0A, or 0B), the PO Check Valve is in both A and B ports, or in A port only, or in B port only (see hydraulic symbols).

The Pilot Ratio is 4:1, consequently, the pilot pressure needs to be at least 1/4, or 25% of the load induced pressure in the actuator before the Check Valve opens, and oil can return to tank.

The body of the EDM-VR- elements is made of Black Anodized Aluminium (AL). Hydraulic Ports A2 and B2 are size G 3/8.

General
Weight EDM-VR AB and A/B:
  • 0.8 kg (1.76 lbs)
Fluid Temperature:
  • –20….+50 (-4….+122) (NBR seals)
Hydraulic
Maximum pressure:
  • 250 bar (3625 psi)
Maximum flow:
  • 50 l/min (13.2 gpm)
Hydraulic fluid General properties: it must have physical lubricating and chemical properties suitable for use in hydraulic systems such as, for example:
  • Mineral oil based hydraulic fluids HL (DIN 51524 part 1). Mineral oil based hydraulic fluids HLP (DIN 51524 part 2). For use of environmentally acceptable fluids (vegetable or polyglycol base) please consult us.
Fluid Temperature:
  • –20….+80 °C (-4….+176 °F) (NBR)
Permissible degree of fluid contamination:
  • ISO 4572: βₓ≥75 X=12…15 ISO 4406: class 20/18/15 NAS 1638: class 9
Viscosity range:
  • Note: For applications with different specifications consult us
  • 5….420 mm²/s
RE18301-40-order
RE18301-40-sym
RE18301-40-02
Cracking pressure
Curve no.
4 bar (58 psi) free flow either A1 > A2 or B1 > B2
1
0.5 bar (7.3 psi) free flow either A1 > A2 or B1 > B2
2
Returning flow, fully piloted, either A2 > A1 or B2 > B1
3

Measured with hydraulic fluid ISO-VG32 at 45° ±5 °C (113° ±9 °F); ambient temperature 20 °C (68 °F).

RE18301-40-dim
1
Four through holes Ø 5.5 mm (0.217 inch) for screws and tightening torques see data sheet RE 18301-90.
2
A and B ports for the actuator.
3
Identification label.