Patent ID: 6321776
Filing Date: 2001-11-27
Classification: F16K,Y10T

Abstract:
A free draining throttling valve comprising:(a) a valve body defining an inlet and an outlet;(b) a throttling surface between said inlet and outlet, said throttling surface comprising an island having a generally annular peripheral surface;(c) a diaphragm having a primary surface and a secondary surface, said surfaces being spaced-apart and being joined at peripheral edges to form an internal diaphragm volume chamber;(d) said primary surface defining a mating throttling surface engageable with said island;(e) drive means on said diaphragm;(f) operator means cooperable with said drive means for selectively positioning said diaphragm between an open flow control position in which a throttling gap is established in which a linear pressure drop occurs with increasing flow velocity and a flow blocking position in which the primary diaphragm closes off flow at said island.