Patent ID: 6454243
Filing Date: 2002-09-24
Classification: B67D,F16K

Abstract:
A seat cup seal for a valve, said seat cup comprising:a base portion; a nipple portion projecting outwardly from said base portion, said nipple portion and said base portion defining a blind bore about a longitudinal axis that opens in said base portion, said nipple portion comprising a transverse end wall at an outermost end relative to said base; a flexible shoulder portion interconnecting said base portion and said nipple portion so that said nipple portion is selectively movable between a first, relaxed position where said transverse end wall is spaced a first distance from said base and a second, retracted position where said transverse end wall is spaced a second distance from said base, said second distance less than said first distance; and, at least one biasing rib projecting outwardly from and extending between said base portion and said nipple portion, said at least one rib urging said nipple portion toward said first position when said nipple portion is in said second position.