Liquid is supplied from a bottle B to a discharge outlet 8 via a molded plastics reservoir 15 by pressurizing the bottle using an air pump 22. A pressure sensor responds to a rise in air pressure supplied to the bottle by shutting off the pump. Liquid is removed from the reservoir through a dip tube...http://www.google.es/patents/US6435379?utm_source=gb-gplus-sharePatente US6435379 - Bottled liquid dispensers
