Improvements in flexible chamber pumps

745,675. Diaphragm pumps. DEB CHEMICAL PROPRIETARIES, Ltd., and WILLIAMSON, A. B. Sept. 6, 1954 [June 8, 1953], No. 15687/53. Class 102(1). A dispensing apparatus includes a diaphragm pump in which the diaphragm 14 is cup-shaped and formed integral with the outlet tube 21. The diaphragm abuts a disc 12a, fitted with an inlet valve 19 and is clamped to a container 13 by a housing 23 ; sealing washers 16, 17 are provided. The outlet tube is fitted with a nozzle 25 having an outlet valve 24, and a spring 28 is located between the housing 23 and the nozzle 25.