Patent ID: 6216729
Filing Date: 2001-04-17
Classification: F15B,F16K,Y10T

Abstract:
A bidirectional check valve for controlling movement of fluid, said bidirectional check valve comprising:a valve body having at least an opening and a further opening therein and having a passage connecting said opening and said further opening;a poppet disposed within said passage of said valve body and arranged such that at least a portion of an outer surface of said poppet and at least a portion of a wall of said passage of said valve body define at least one channel; said poppet having at least an opening therein in proximity to said opening in said valve body and a passage connecting to said opening in said poppet;a spring coupled to said poppet and arranged to drive said poppet in a direction such that when fluid passing through said opening in said valve body exerts a force on said poppet that is less than said spring force, a further portion of said outer surface of said poppet contacts a further portion of said passage wall of said valve body and prevents said fluid from flowing from said opening in said valve body into said channel, and when said fluid exerts a force on said poppet that is greater than said spring force, said poppet is directed away from said further portion of said passage wall and permits said fluid to flow from said opening in said valve body through said channel and to said further opening in said valve body;a further poppet disposed within said passage formed in said first mentioned poppet and arranged such that at least a portion of an outer surface of said further poppet and at least a portion of a passage wall of said poppet define at least one further channel; said outer surface of said further poppet having at least an opening therein that connects to a passage formed within said further poppet; said passage within said further poppet connecting to a further opening in said further poppet that is in proximity to said opening in said poppet; anda further spring coupled to said poppet and to said further poppet and arranged to drive said further poppet in a further direction such that when fluid passing through said further opening in said valve body exerts a force on said further poppet that is less than said further spring force, a further portion of said outer surface of said further poppet blocks said further channel and prevents said fluid from flowing from said further opening in said valve body into said further channel, and when said fluid exerts a force on said further poppet that is greater than said further spring force, said further portion of said outer surface of said further poppet is directed away from said further opening in said valve body to open said further channel and permit said fluid to flow from said further opening in said valve body through said further channel, said at least one opening in said further poppet, said further passage in said further poppet, said further opening in said further poppet and said opening in said poppet to said opening of said valve body.