公开(公告)号：CA1260928A

公开(公告)日：1989-09-26

申请号：CA510265

申请日：1986-05-29

Applicant: ECOLAB INC

Inventor： THOMAS JOHN E ,  SABY DARRELL R ,  MEHUS RICHARD J

IPC: A47L15/46 ,  A47L15/44 ,  D06F39/02 ,  F16K21/10 ,  G01F13/00 ,  G01N1/00

Abstract: Method and apparatus for dispensing a liquid detergent solution using a timing fluid. A preferred cleaning system (10) includes a fluid-operated solvent metering apparatus (38). The metering apparatus (38) preferably includes a normally-closed valve (16) and a timing device (40). The timing device (40) preferably includes a cylinder (52) and a piston (54), wherein the piston (54) forms a pair of subchambers (56, 58) which are interconnected by a flow control device (68). The flow control device (68) serves to restrict the flow of a timing fluid from one subchamber (56) to the other subchamber (58) so as to hold the valve (16) in its open position for a period of time following its initial manual opening. A return spring (48) in the normally closed valve (16) urges the valve (16) toward its closed position, and the spring (48) also acts against the piston (54) to cause the timing fluid to flow from the first subchamber (56) to the second subchamber (58). A water source 12 and a detergent source 14 are in fluid communication for the period of time that the valve (16) is held open.