Steve R Massie

US Patent:

20080011487, Jan 17, 2008

Filed:

Jul 13, 2006

Appl. No.:

11/485868

Inventors:

Mark Bertane - Glen Ellyn IL, US
Steve Massie - West Chicago IL, US

Assignee:

BLACKHAWK ENVIRONMENTAL CO. - Glen Ellyn IL

International Classification:

E21B 43/00

US Classification:

166369, 166105

Abstract:

A drive piston valve and a foot valve may each have a valve seat in the form of a non-compressible (e.g., metal or ceramic) sealing plate having a compressible, resilient mating element that retains the ring at an inlet portion of a check valve having a housing formed of another material, such as a low-wear resin material. In some examples, the sealing plate may have a truncated corner for engaging a check ball in its closed positioned while avoiding damage to the check ball or plate resulting from a chemical encrustation build-up or other containment at the sealing edge.