Valve having contamination counter-measures

Abstract

An anti-coking valve arrangement having a valve body that defines a passage for the flow of fluid medium. Valve seat and valve member positioned within the valve body and function to control the flow of fluid medium. A first anti-coking device is operably associated with the valve stem. A second anti-coking device is operably associated with the bearing guide member. A third anti-coking device is operably associated with the valve member and the valve seat. A fourth anti-coking device is operably associated with the valve stem and the bearing guide. A fifth anti-coking device is operably associated with the bearing guide. A sixth anti-coking device is operably associated between the valve stem and the bearing guide.

1 - 29 . (canceled)  
     
     
         30 . A valve arrangement comprising: 
 a guide;    a valve member connected to a valve stem at least partially extending into said guide, wherein said valve member moves with respect to said guide between an open position and a closed position;    a scraper located in said guide;    a seal operably associated between said valve stem and said guide.    
     
     
         31 . The valve arrangement of  claim 30  further comprising: 
 a second seal operably associated between said valve stem and said guide; and    a lubricant placed between said seal and said second seal.    
     
     
         32 . The valve arrangement of  claim 30  wherein said scraper is operably associated between said valve stem and said guide, wherein said scraper circumscribes said valve stem creating a clearance between said scraper and said valve stem, said small clearance is less than the clearance between said guide and said valve stem.  
     
     
         33 . The valve arrangement of  claim 30  wherein said scraper is a floating scraper capable of moving within a pocket of said guide.  
     
     
         34 . A valve arrangement comprising: 
 a valve member;    a valve stem connected to said valve member for facilitating the movement of said valve member between an open position and a closed position;    a guide member supporting said valve stem; and    a scraper operably associated between said valve stem and said guide, wherein said scraper circumscribes said valve stem creating a small clearance between said scraper and said valve stem, and said small clearance is less than the clearance between said guide and said valve stem.    
     
     
         35 . The valve arrangement of  claim 34  wherein said scraper is a floating scraper capable of moving within a pocket of said guide.  
     
     
         36 . A valve arrangement comprising a valve member; 
 a valve stem connected to said valve member for facilitating the movement of said valve member between an open and closed position;    a guide supporting said valve stem;    a scraper operably associated between said valve stem and said guide; and    a stem shield being extended along said valve stem to prevent contamination build up on said valve stem.    
     
     
         37 . The valve arrangement of  claim 36  wherein said stem shield is integrated with said guide.  
     
     
         38 . The valve arrangement of  claim 37  wherein said stem shield extends toward said moveable poppet, preventing said contaminant from building up on said valve stem.  
     
     
         39 . The valve arrangement of  claim 36  further comprising: 
 a first seal operably associated between said valve stem and said guide;    a second seal operably associated between said valve stem and said guide; and    a lubricant placed between said first seal and said second seal.    
     
     
         40 . The valve arrangement of  claim 36  wherein said scraper circumscribes said valve stem and creates a small clearance between said scraper and said valve stem and said small clearance is less than the clearance between said guide and said valve stem.  
     
     
         41 . An anti-coking valve arrangement comprising: 
 a valve seat defining an internal passage for a fluid medium;    a valve member operably associated with said valve seat;    a valve stem connected to said valve member for facilitating the movement of said valve member;    a guide member supporting said valve stem; and    a first and anti-coking device operably associated with said valve stem.    
     
     
         42 . The valve arrangement of  claim 41  further comprising a second anti-coking device operably associated with said guide member.  
     
     
         43 . The valve arrangement of  claim 42  further comprising a third anti-coking device operably associated with said valve member and said valve seat.  
     
     
         44 . The valve arrangement of  claim 43  further comprising a fourth anti-coking device operably associated with said valve stem and said guide.  
     
     
         45 . The valve arrangement of  claim 41  further comprising an anti-coking device operably associated with said bearing guide.  
     
     
         46 . The valve arrangement of  claim 41  further comprising an extension on said valve seat that provides a reduced contact seating area between said extension and said valve member while maintaining the minimum flow area through said valve seat.  
     
     
         47 . The valve arrangement of  claim 41  further comprising a lubricant on the surface of said valve stem and a portion of said valve stem disposed through said bearing member.  
     
     
         48 . The valve arrangement of  claim 41  further comprising a first seal located on said valve stem at the opposite end of said valve member, and a second seal located at an intermediary position along said valve stem, wherein said first seal and said second seal prevent the build up of contaminants on said valve stem.  
     
     
         49 . The valve arrangement of  claim 48  wherein said first seal is an upper stem seal located on one side of said bearing member and a lower stem seal located on a second side of guide member.  
     
     
         50 . The valve arrangement of  claim 41  further comprising a scraper comprised of a device which circumscribes said valve stem creating a small clearance between said scraper and said valve stem.  
     
     
         51 . The valve arrangement of  claim 50  wherein said small clearance allows said scraper to remove contaminants from said valve stem.  
     
     
         52 . The valve arrangement of  claim 50  wherein said small clearance is less than the clearance between said bearing guide and said valve stem.