ONE-PIECE DISPENSING SYSTEM AND METHOD FOR MAKING SAME

摘要

A dispensing system is provided for being sealingly disposed with respect to , and dispensing a product from, a discharge opening of a container (41) wherein an annular mounting flange (70 ) extends radially inwardly adjacent the opening. A valve (30) is molded from a material to define a flexible, resilient structu re having a head portion (82) and a surrounding marginal portion (100). The head portion (82) has a normally closed dispensing orific e (84) which opens when the pressure in the interior of the container (41) exceeds the pressure on the exterior of the valve (30) by a predetermined amount. The marginal portion (100) is connected with the head portion (82) and has a generally annular wall (102) defining a generally annular groove (104) which is open radially outwardly for receiving the mounting flange (70). The annular wall (102) is sufficiently flexible to elastically deform as the wall (102) is forced against the mounting flange (70) to accommodate sealing of the mounting flange (70) in the groove (104). The annular wall (102) is sufficiently resilient to accommodate the retention of the mounting flange (70) in the groove (104) by adjacent portions (112, 114) of the annular wall (102).