For a pressure reduction, an aerosol spray can filled with a compressed pressure gas requires, upstream of its spray valve, REDUCING VALVESa pressure regulation valve with a closing point. In known embodiment types a flow occurs around the outside of the pressure reduction valve, which requires a complicated housing structure.API Cast Steel Valves It is therefore proposed that the connection between the closing point and the spray valve take place via a central bore in the piston of the pressure reduction valve, preferably without a flow through the pressure chamber, but instead past the latter. The simple construction is advantageous,Bellows Seal Valves with which it is also possible to provide easy access to the piston from the outside in order to maintain it in its opened position for easier filling under pressure.  An aerosol spray can comprising: a pressure reduction valve provided between a can interior and a closeable spray valve, wherein, viewed in an outflow direction downstream of a closing site, a pressure chamber is provided for pressure regulation, in which pressure chamber a piston can be moved which closes the closing site against a force of a spring, when pressure in the pressure chamber rises above a standard pressure, and wherein a connection between the closing site and the spray valve takes place via a central bore in the piston. A particular advantage of the aerosol spray can of the invention lies in that it is possible to provide a housing for the pressure reduction valve which supports the sealing element of the closing site and whose exterior wall delimits the pressure chamber on the inside. The spring of the pressure reduction valve, which is embodied as a helical spring or a gas pressure spring, is arranged between the housing and the piston, wherein the spring is preferably supported on a housing insert, which is locked, pressed, welded and/or glued together with the cylinder wall of the housing. The space between the housing and the piston in which the spring is arranged is preferably pressure-sealed toward the can interior in order to avoid an effect on the pressure regulation by penetrating aerosol. The space-saving construction of the pressure valve of a spray can in accordance with the invention permits the provision of the largest possible piston diameter, along with a corresponding adaptation of the force of the piston spring, and in this way the optimization of the regulation accuracy. A pressure gas cushion, which constitutes a gas pressure spring, can also be enclosed in the sealed space between the housing and the piston.

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