| 摘要 |
A pour spout including a liquid metering orifice and a reciprocating control valve assembly mounted to prevent “blocked”, “short shot” and “free pour” conditions. The control valve assembly controls a pressure differential to restrain and release a primary flow valve piece. Weight pieces are included at alternative shutter-acting control valve pieces. Other electromechanical and/or electromagnetic and/or permanent magnet control valve assemblies are disclosed. A molded pour spout is also provided having a check ball mounted for reciprocating movement between a plurality of integral ribs that project into a longitudinal flow path. An improved vent assembly is also provided to maintain the pour accuracy with progressively decreasing liquid volume.
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