Flow control valve with integrated pressure controller

摘要

A flow control valve has two successively arranged throttle locations. The first throttle location serves as an adjusting member for the through-flow. The second throttle location controls the pressure difference across the first throttle location to a constant value. The first throttle location is formed by a control member (4) which co-operates with a first valve seat (5) of a valve insert (7) which is fixedly connected to the valve housing (6). The second throttle location is formed by a pressure regulating member (9) which co-operates with a second valve seat (10) of the valve insert (7). The control member (4) and the pressure regulating member (9) are displaceable in an identical direction (12) and connected by means of a resilient diaphragm (13). The inlet chamber (1) is communicated with a pressure chamber (15) which acts on the diaphragm (13) and on the pressure regulating member (9). The operative surface which transmits the pressure (p1) obtaining in the inlet chamber (1) to the pressure regulating member (9) is approximately equal to the operative surface which transmits the pressure (p2) obtaining between the two throttle locations to the pressure regulating member (9). In that arrangement the flow medium flows rotationally symmetrically through the second throttle location.