Vertical metering pump having piston biasing elastomeric gasket

Abstract

A miniature metering pump of the type possessing a body provided with an inlet opening out into a metering chamber, associated with an inlet valve having a valve member, and with a piston having a plunger provided with an axial nozzle and flared at its bottom end to form a hood receiving a sealing gasket, its internal channel being associated with an outlet valve having a valve member, wherein said outlet valve member forms a portion of a single elastically deformable part that constitutes said gasket, shaped to have a bottom U-shaped ring assembled round the hood of the plunger, and connected at the top on the outside to a substantially cylindrical skirt for sealing and for returning the piston to its rest position, which skirt runs on from an annular flange for providing sealed connection with the body; and on the inside by a folded valve member that is generally conical or mitral-valve shaped, with a narrow top end carrying a cutout surrounded by a lip that opens to provide an outlet orifice.

Dependencies are inferred from the claim text.