PCM offer a range of hydraulic valves from stock.
Tipper Control Valves (various brand options)
Flow Reg Valves
Directional Control Valves etc.
Valves form part of an integrated system of control and reference should be made to manufacturer's manuals.
A valve is a device for the control of flow. A valve may also, by controlling flow, control pressure, usually by diverting and differentiating flow. The simplest form of valve is an open/closed device or tap.