DG4V30CMWLB40

The DG4V30CMWLB40 directional control valve belongs to the DG4 Directional Valves series and is manufactured by Vickers for hydraulic automation circuits. It uses spool type 0, an open-center design that unloads pump flow in the neutral position to limit heat generation. A spring arrangement coded C recenters the spool automatically when pilot force is removed, so actuator movement stops without external intervention. Ports tolerate a maximum working pressure of 350 bar (5000 psi), allowing the valve to run in high-pressure mobile or industrial systems. Continuous duty rated at 100 percent ED confirms the coil can remain energized indefinitely without thermal overload. Reliable service also depends on maintaining fluid cleanliness at ISO 4406 19/17/14, which limits particle contamination that could erode spool lands or block orifices.

For installation, the DG4V30CMWLB40 matches the ISO 4401-03 mounting interface, also known as CETOP 3 or NFPA D03, so it fits directly on standard subplates used across many machines. Connection holes are tapped to M5 × 0.8-6H, with an alternate 10-24 UNC-2B option, providing flexibility for metric or imperial fasteners. Bolts must meet grade 12.9, equivalent to SAE grade 7, to generate the clamping force required under full system pressure. The mating surface needs a finish of 1.1 µm (45 µin) Ra to prevent external leakage paths, and overall flatness has to stay within 0.013 mm to avoid internal bypassing that would reduce flow accuracy.