KDG4V-3(S) Series Subplate/Manifold Mount NFPA Size D03 Proportional Valve, 4-Way, 3-Position, Spring Centered, Closed Center, Meter In & Meter Out, 24VDC Current Controlled DIN 43650 Coil. STD Performance, 1450 PSI Port T, Waterproof Manual Override

It uses the ISO 4401-03 interface, also called NFPA D03, CETOP 3, or NG06. That is the standard subplate and manifold pattern for this size, so it is meant to mount directly to a D03 manifold or subplate.

For most industrial setups, standard performance proportional valves hit a solid middle ground. This series is rated for die casting, machine tool work, marine and offshore environments, press use, primary metal and paper processing, test equipment, and turbine control. It sits between conventional solenoid directional valves and full servo or feedback-type proportional valves, so it handles applications that need metered flow control without requiring the extreme accuracy or repeatability of a servo system. If your process demands tight positional feedback or very high repeatability, you'd want to step up to a high or ultra performance variant. For most general industrial work in that list, standard is plenty.

This valve is designed for industries like die casting, marine applications, machine tool use, and turbine control, among others.