Patent ID: 6446657
Filing Date: 2002-09-10
Classification: F01D,F04D,Y10T

Abstract:
Control valve apparatus for controlling the flow of a fluid comprising a hollow housing with a rod located therein, said hollow housing having a passage way for fluid being controlled and two end portions, shut off valve means located in one end portion of said hollow housing for starting and stopping the flow of fluid in the passage way for fluid being controlled in said hollow housing, said shut off valve means comprising a piston member with an aperture extending therethrough sized to accept said rod, said piston member of said shut off valve means being located for reciprocating movement on said rod with the aperture in said piston member receiving said rod, modulating valve means located in the other end portion of said hollow housing for modulating the flow of fluid in the passage way for fluid being controlled in said hollow housing, said modulating valve means comprising a piston member with an aperture extending therethrough sized to accept said rod, said piston member of said modulating valve means being located for reciprocating movement on said rod with the aperture in said piston member receiving said rod and control means associated with said piston member of said shut off valve means and said piston member of said modulating valve means for separately controlling the reciprocating movement of said piston member of said shut off valve means and said piston member of said modulating valve means, said control means comprising two fluid chambers located within said hollow housing for controlling the position of said piston member of said shut off valve means and two fluid chambers located within said hollow housing for controlling the position of said piston member of said said modulating valve means with said piston member of said shut off valve means forming a portion of both fluid chambers for controlling the position of said piston member of said shut off valve means and said piston member of said modulating valve means forming a portion of both fluid chambers for controlling the position of said piston member of said modulating valve means.