Patent ID: 8104740
Filing Date: 2012-01-31
Classification: F16K,G05D,Y10T

Abstract:
1. A flow control device comprising: a housing including a first chamber communicated with an inlet port and a second chamber communicated with an outlet port; a cylindrical portion, which extends in the second chamber, for communicating the first chamber with the second chamber; a valve seat provided at a forward end portion of the cylindrical portion; a valve body for opening and closing the valve seat; a pressure chamber having a pressure port disposed in the housing in communication with the second chamber; a first flexible separation arrangement connected to a second flexible separation arrangement for sealingly separating the second chamber from the pressure chamber, wherein the first flexible separation arrangement is exposed to fluid in the pressure chamber and the second flexible separation arrangement is connected to the valve body and is exposed to fluid in the second chamber; a bed disposed between the first and second flexible separation arrangements; elastic members, which are softer than the bed, disposed between the first flexible separation arrangement and the bed and disposed between the second flexible separation arrangement and the bed; and a tightening arrangement which is configured to tighten an outer circumference of the forward end portion of the cylindrical portion, wherein the tightening arrangement includes an extension portion extending along a length of the forward end portion, wherein at least one of the valve seat and the valve body is made of a material which has a heat deformation that is smaller than a heat deformation of a material composing the cylindrical portion, wherein each of the first flexible separation arrangement and the second flexible separation arrangement includes an annular thin film portion which is curved toward the second chamber around the bed, and wherein the bed includes an annular curved portion having an upper face including a shape corresponding to a recessed face of the annular thin film portion of the first flexible separation arrangement and a lower face including a shape corresponding to the annular thin film portion of the second flexible separation arrangement.