Patent ID: 6422260
Filing Date: 2002-07-23
Classification: E03C,Y10T

Abstract:
A trap primer, comprising:a body defining an inlet port, an outlet port and a trap primer port in fluid communication with a shut off cavity; and a piston assembly received within the shut off cavity, said piston assembly including a piston movable in a longitudinal direction within the shut off cavity, said piston comprising a piston body having an outer surface, said outer surface has a plurality of circumferentially-spaced fingers extending along the longitudinal direction, said fingers defining finger passageways therebetween that extend along the longitudinal direction and said piston includes a piston sealing surface, and a seat defining a passageway in fluid communication with the trap primer port, said seat includes a seat sealing surface, wherein said piston is biased in a first position to block the passageway of said seat when liquid is not flowing through the body, and said piston is adapted to move to a second position when fluid is flowing from the inlet port to the outlet port through the body, permitting fluid to flow through the passageway of said seat whereby when said piston is in the first position, said piston sealing surface contacts said seat sealing surface and blocks said passageway and when said piston is in the second position said piston sealing surface is spaced a distance away from said seat sealing surface.