A dispenser for precisely dispensing fluid from a storage vessel into a recipient vessel includes a housing formed with a connector portion having a valve chamber with a suction valve and a discharge valve therein. A cylinder is mounted on the connector portion. The valve chamber contains a suction valve...http://www.google.com.tw/patents/US4995532?utm_source=gb-gplus-share專利 US4995532 - Fluid metering apparatus for supplying fluid out of a storage vessel to a receiver
