Contamination and flow control

A valve comprising:

• a valve housing including a valve seat;
• a land disposed in said valve housing;
• a first chamber and a second chamber formed by said valve housing and said land;
• a supply port connected to said second chamber;
• a valve member including a valve shaft slidably disposed through said land, extending from said first chamber through said land and into said second chamber, and a valving portion;
• a control chamber controlled by said valve member;
• a contamination control arrangement operably associated with said land and circumferentially disposed about said valve shaft for the buildup of contaminant between said land and said valve shaft, wherein said contamination control arrangement removes debris from an annulus between said valve shaft and said land as said valve shaft slides through said land, and subsequent movements of said valve shaft through said land causes said debris to move through said contamination control arrangement from said second chamber to said first chamber;
• and
• said valve seat positioned between said supply port and said control chamber for controlling the flow of fluid between said supply port and said control chamber in response to the movement of said valving member in relation to said valve seat wherein said contamination control arrangement removed debris from an annulus between said valve shaft and said land by pressurized fluid from said second chamber migrating through said contamination control arrangement to said first chamber.

A valve having an contamination control arrangement, comprising:

• a valve housing;
• a land, where said land is positioned in said valve housing;
• a valve member having a valve shaft slidably disposed through said land, and a valving portion;
• a supply port for supplying fluid to said valve member;
• a control chamber controlled by said valve member;
• a valve seat operably associated with said valving portion of said valve member positioned between said supply port and said control chamber;
• and,
• a contamination control arrangement positioned between said land and said valve shaft, wherein said contamination control arrangement removes debris from the annulus between said valve shaft and said land as said valve shaft slides through said land and subsequent movements of said valve shaft through said shoulder causes said debris to move through said contamination control arrangement from said second chamber to said first chamber wherein said contamination control arrangement removes any contaminate present on said valve shaft or in an annulus between said valve shaft and said land when high pressure fluid from said second chamber migrates through said contamination control arrangement to said first chamber.