Patent ID: 6695005
Filing Date: 2004-02-24
Classification: G05D,Y10T

Abstract:
A pressure regulating valve for controlling an upstream fluid pressure in relation to a reference pressure by regulating the fluid quantity let through the valve, comprising a housing (1) having an upstream inlet (2) and a downstream outlet (3) for the fluid, a pressure-sensitive element (5) for sensing the pressure difference between the upstream pressure and the reference pressure, and a spring-loaded regulating piston (7) which, in cooperation with a seat (8), is arranged to regulate a flow passage (9) between the inlet (2) and the outlet (3), the piston (7) being operatively connected to the pressure-sensitive element (5), wherein the regulating piston (7) is slidably arranged on the outside of a guide sleeve (10) having openings (11) for flow of fluid from the flow passage (9) to the outlet (3), and that the valve comprises a chamber (15) defined between an end surface (13) of the guide sleeve (10) and an inner end surface (14) of the piston (7), and a pilot body (16) which is mechanically coupled to the pressure-sensitive element (5) and is arranged to open ducts (20-23) for supply of fluid from the inlet (2) to the chamber (15) or delivery of fluid from the chamber (15) to the outlet (3) dependent on the position of the pilot body (16) relative to the regulating piston (7), so that the piston changes its position dependent on the chamber volume and thereby in accurate correspondence with the position of the pressure-sensitive element (5).