Patent ID: 7494075
Filing Date: 2009-02-24
Classification: B65D,Y10T

Abstract:
1. A pressure regulating valve for use in an aerosol spray can having a spray valve, in which the pressure regulating valve is used to lower a pressure level prevailing in a compressed-gas-filled interior of the can to a regulation pressure level at which the spray valve is desired to operate, the pressure regulating valve comprising: a housing having a pressure regulation chamber which in use communicates with the spray valve, a regulating piston which is guided for movement in said housing and which in use is kept in equilibrium between a regulated pressure acting on a pressure end of said piston located in said pressure regulation chamber and a restoring force, said piston also having a free end remote from the pressure end, a sealing point provided between said regulating piston and said housing which is closed when the regulating pressure in said pressure regulation chamber is above the regulation pressure level of the spray valve, and a sealing means which is used for sealing off said free end of said piston at all times a) from the pressure level prevailing in the can interior and b) from the regulated pressure in said pressure regulation chamber, so that in use the pressure acting on said free end of the piston is at all times independent of the pressure level prevailing in the can.