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Non-return valves for vacuum pumps

  • US 20040120838A1
  • Filed: 09/17/2003
  • Published: 06/24/2004
  • Est. Priority Date: 09/20/2002
  • Status: Abandoned Application
First Claim
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1. A vacuum pump non-return valve comprising a valve body that defines a through-passage having an inlet end and an outlet end, an annular elastomeric insert located on the valve body intermediate the inlet and outlet ends and defining a valve seat, and a ball arranged to seat against the valve seat to prevent passage of gaseous fluids from the outlet end to the inlet end and being displaceable, in use, from the valve seat by pressurised gaseous fluid in the inlet end to permit passage of the gaseous fluid from the inlet end to the outlet end.

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