Patent ID: 6062257
Filing Date: 2000-05-16
Classification: F24D,G05D,Y10T

Abstract:
A flow control valve for controlling the through-flow of a flow medium, comprising an inlet chamber (1), two successively arranged throttle locations and an outlet chamber (3), wherein the first throttle location serves as an adjusting member for the through-flow and wherein the pressure difference (p.sub.1 -p.sub.2) across the first throttle location is controllable to a constant value by means of the second throttle location, andthe first throttle location is formed by a control member (4) which co-operates with a first valve seat (5),the second throttle location is formed by a pressure regulating member (9) which cooperates with a second valve seat (10), andthe inlet chamber (1) is communicated with a pressure chamber (15) which at least partially acts on the pressure regulating member (9);characterised in thata first operative surface (A.sub.1) which transmits the pressure (p.sub.1) obtaining in the inlet chamber (1) to the pressure regulating member (9) is approximately equal to a second operative surface (A.sub.2) which transmits the pressure (p.sub.2) obtaining between the two throttle locations to the pressure regulating member (9),the pressure regulating member (9) permits a rotationally symmetrical through-flow of the flow medium, anda third operative surface (A.sub.3) which transmits the pressure (p.sub.1) obtaining in the inlet chamber (1) to the control member (4) in the first direction (12) is approximately equal to a fourth operative surface (A.sub.4) which transmits the pressure (p.sub.1) obtaining in the inlet chamber (1) to the control member (4) in the direction opposite to the first direction (12).