Flow Control Hydraulic Valve

These Vickers DG17V4-01 valves are suitable for marine and offshore applications, so it should fit your needs on a boat.

Quite a few, actually. The DG17V4-01 sees regular use in die casting and foundry use, machine tool applications, press setups, marine and offshore environments, primary metal and paper processing, test equipment, and turbine control systems covering wind, steam, and water. It's a widely applied valve across heavy industrial work.

Function-wise it’s a Vickers DG17V4 series directional control valve. It’s listed as a three- or four-way directional control style, single stage, meant for routing hydraulic flow to control actuator direction rather than acting as a simple needle-type flow restrictor.