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Replaceable filter cartridge and head assembly with safety shut-off valve

  • US 5,336,406 A
  • Filed: 01/26/1993
  • Issued: 08/09/1994
  • Est. Priority Date: 01/26/1993
  • Status: Expired due to Term
First Claim
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1. A filter assembly adapted for connection between fluid supply and delivery lines to filter fluid flowing therethrough, comprising, in combination,a replaceable filter cartridge enclosing a filter medium and having at one end concentric entrance and exit passages confined within an axially outwardly projecting annular wall,a mounting head having inlet and outlet ports adapted for substantially fixed connection to said supply and delivery lines, respectively, said mounting head having a cylindrical recess for sealingly receiving said annular wall of said filter cartridge therein,said filter cartridge and said mounting head each having complementary interfitting means thereon for permitting quick locked connection and unlocked disconnection of said filter cartridge to and from said mounting head incident to axial rotation of said filter cartridge in opposite directions, respectively, relative to said mounting head,inlet passage means in said mounting head for communicating between said inlet port and said cylindrical recess,valve means disposed in said inlet passage means, said valve means being biased to a normally closed position,and valve operating means on said one end of said filter cartridge for opening said valve means incident to axial rotation of said filter cartridge into fully locked connection with said mounting head.

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