Machine Design

Valve separates power from control

Anew directionalcontrol solenoid valve from Eaton Hydraulics, Eden Prairie, Minn., is said to facilitate distributed control of hydraulic systems. It takes advantage of contemporary wiring practices to meet automotive-manufacturing specifications.

Anew directionalcontrol solenoid valve from Eaton Hydraulics, Eden Prairie, Minn., is said to facilitate distributed control of hydraulic systems. It takes advantage of contemporary wiring practices to meet automotive-manufacturing specifications.

Vickers DG4V3 solenoid valves wire directly to M12 4-pin connectors on a Cutler-Hammer junction block mounted adjacent to the valve manifold. The trunk connecting the junction block and control cabinet carries 24-Vdc power and separate command and sensor feedback wires.

Power is distributed in the J-block and fed to solenoid valves along with solenoid command signals via the M12 cable sets. Current to each solenoid is switched on the valve and controlled by low-current (10 mA or less) command signals from a PLC.

The power supply, junction block, and cable sets from Eaton Electrical are said to provide costeffective control and wiring of hydraulic valves. It lets a compact, low-power, and economical PLC control full-power, 30-W hydraulic solenoid valves.

Advantages of onboard current switching include lower control costs, quicker installation with off-the-shelf components, and simplified start-up.

Standard features include plug-in coils with 30, 18, and 10-W ratings. They have LED indicators, surge suppression diodes, and are IP67 rated. Onboard electronic control of the coil current is optional. The ISO 4401 Size 3 valves are rated for maximum flows of 21 gpm, pressures to 5,000 psi, and tank line pressures to 3,000 psi.

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