Patent ID: 6053200
Filing Date: 2000-04-25
Classification: F16K,Y10T

Abstract:
The combination comprising a process apparatus, a valve fluidly connectable to said process apparatus, and a sensor in fluid communication with said valve, whereby the properties of substances can be measured without exposure of said substances to the environment, said valve comprising:a valve body having an inlet end fluidly connectable to process apparatus;a first valve seat positioned in said valve body, said first valve seat having a first valve sealing surface;a stem chamber extending through said valve body, said stem chamber having an upper port, a first seat port, a second seat port, a vent port and a sensor port, said upper port, said first seat port, said vent port, and said sensor port fluidly communicating with said stem chamber, said second seat port fluidly positioned between said sensor port and said vent port, said vent port fluidly positioned between said second seat port and said upper port;a second valve seat fluidly positioned in said valve body between said sensor port and said vent port, said second valve seat having a second valve sealing surface;a valve stem slidably and sealingly positioned in said valve body and extending into said stem chamber, said valve stem having a plug end positioned within said stem chamber;a plug attached to said plug end of said valve stem, said plug having a first plug sealing surface and a second plug sealing surface, said first plug sealing surface adapted to be sealingly engageable with said first valve sealing surface, said second plug sealing surface adapted to be sealingly engageable with said second valve sealing surface; andan actuator connected to said valve stem.