Patent ID: 6497246
Filing Date: 2002-12-24
Classification: F16K,Y10S,Y10T

Abstract:
A pneumatically actuated apparatus for energizing or de-energizing a control device, comprising:a body assembly having an upper chamber, a middle chamber and a lower chamber; an inlet for receiving a supply gas into said upper chamber; a gas outlet for passing the supply gas from said middle chamber to the control device; an exhaust port for venting gas from said lower chamber; a first valve fluidly connecting said upper chamber with said middle chamber, wherein said first valve includes a ball located in said upper chamber that, when said first valve is in a closed position, simultaneously sealingly engages both a surface portion of a first valve seat in said body and an elastomeric sealing element; a second valve fluidly connecting said middle chamber with said lower chamber, including a second valve seat in said body; and a thrust pin positioned within said body having an upper shaft portion and a seat contacting portion, said thrust pin being movable between a first position and second position, whereby in said first position said upper shaft portion is spaced from said ball allowing for the closure of said first valve and said seat contacting portion is spaced from said second valve seat so that said second valve is open, while in said second position said upper shaft portion displaces said ball to open said first valve and said seat contacting portion sealingly engages a surface of said second valve seat to close said second valve.