Apparatus for discharging a fluid, and, more particularly, for spraying a liquid

Abstract From the Canadian patent

A liquid dispensing apparatus comprises a container having a peripheral sidewall a bottom wall, mounted at a lower end of the sidewall and a closure removably mounted to an upper end of the sidewall. A flexible tight plastic bag is mounted at an upper end thereof between the closure and the sidewall and hangs in the container . The bag thus defines in the container first and second chambers which respectively contain a liquid to be dispensed and compressed air. A nozzle extends through the closure into the first chamber. A pressure regulating valve is mounted in the second chamber and defines therein upper and lower sub-chambers, with the bag being submitted to forces exerted by the …