Hydraulic valve means

A seat valve arrangement for controlling a main supply flow of high pressure in a main supply flow passage by means of a pilot flow derived from said main supply flow, comprising a valve housing incorporating a part of the main supply flow passage, a valve seat surrounding said passage within the valve housing, a valve body slidably located within a cylindric space of the valve housing for movement from a closed position to an open position, a pilot flow chamber situated within the valve housing at the valve body end remote from the valve seat and being in communication with the main supply flow passage upstream of the valve seat as well as downstream thereof, a variable flow restriction arranged in the connection between the main supply flow passage upstream of the valve seat and the pilot flow chamber, and a pilot valve arranged in the connection between the pilot flow chamber and the main supply flow passage downstream of the valve seat, for creating said adjustable pilot flow for controlling of the main supply flow as a function of the pilot flow, and a pressure reducing valve means located in the pilot flow connection between the pilot flow chamber and the pilot valve for rendering said valve independent of pressure drop, by sensing the inlet pressure (Ps) in the main flow passage before the valve seat as well as the pressure after the valve seat in the associated pilot flow connection in such a way that said sensings correspond to a sensing of the return pressure (Pr) after the valve seat.