초록 ▼

An automatic change-over system for stock rotation of liquids packages in plural collapsible bag-type reservoirs including an improved automatic change-over valve is described. The bag-type reservoirs are divided into primary and secondary groups, the primary group containing a supply of liquid prod

An automatic change-over system for stock rotation of liquids packages in plural collapsible bag-type reservoirs including an improved automatic change-over valve is described. The bag-type reservoirs are divided into primary and secondary groups, the primary group containing a supply of liquid product which is currently being dispensed and the secondary group containing a supply of liquid product which is held in reserve. An automatic change-over between the primary and secondary groups of bag-type reservoirs is effected in response to a vacuum created by an empty condition in the bags in the primary group. A pressure change in the system results from the deflation of the empty bag-type packages which switches the change-over valve. Thus, the change-over is caused by the characteristics of the flexible bags containing the liquid being dispensed and the valve mechanism which connects the primary group, the secondary group and a dispensing pump together.

대표청구항 ▼

In an automatic change-over device for a liquid dispensing system including, first and second sets of at least one collapsible bag for containing a liquid to be dispensed, each of said collapsible bags having a first volume when full and deflating to a second volume when empty, and pump means for dr

In an automatic change-over device for a liquid dispensing system including, first and second sets of at least one collapsible bag for containing a liquid to be dispensed, each of said collapsible bags having a first volume when full and deflating to a second volume when empty, and pump means for drawing said liquid out of said first or second sets of collapsible bags when in circuit with said first or second sets, respectively, the improvement comprising: a change-over valve means in circuit between said first and second sets of bags and said pump means for providing selective communication therebetween, said change-over valve means including a single pressure sensitive check-valve which is normally closed for selectively providing an obstruction between said second set of bags and said pump means in an initial position and for selectively providing an obstruction between said first set of bags and said pump means in a second position, said single pressure sensitive check-valve means being opened in said initial position in response to a pressure change created by said second volume of said first set of bags, said single pressure sensitive check-valve means being opened in said second position in response to a pressure change created by said second volume in said second set of bags, and means for transferring by a force other than said pressure changes, said single pressure sensitive check-valve means between said initial and second positions to selectively provide said obstruction in either the initial or second positions.