Patent ID: 6199582
Filing Date: 2001-03-13
Classification: G05D,Y10T

Abstract:
A valve (10) for controlling the flow rate of fluid, comprising a body (11) and a valve mechanism (40),the body defining a chamber (20) that involves an inlet (12) for receiving the fluid, a valve seat (16) for passing the fluid, and an outlet (15) for discharging the fluid,the valve mechanism consisting of a valve plug (41) for opening and closing the valve seat, a first diaphragm (50) arranged in the vicinity of the inlet, and a second diaphragm (60) arranged in the vicinity of the outlet,each of the diaphragms being in the chamber and having a periphery fixed to the body, the diaphragms dividing the chamber into a first pressure chamber (21) outside the first diaphragm, a valve chamber (25) between the diaphragms, and a second pressure chamber (30) outside the second diaphragm, the valve chamber including the inlet, valve seat, and outlet, the first and second pressure chambers being provided with first pressurizing means (M1) and second pressurizing means (M2), respectively, to always apply constant pressure to the valve chamber through the first and second diaphragms, wherein:the first diaphragm (50) is provided with an integrated first member (51) having the valve plug (41) and the second diaphragm (60) is provided with an integrated second member (61) that removably engages with the first member.