Patent ID: 8109270

Claim:
A dispensing valve with admission pressure compensation, the dispensing valve comprising: an admission pressure chamber; a back pressure chamber; a valve drive; a working diaphragm between said admission pressure chamber and said back pressure chamber; a compensation chamber connected to said admission pressure chamber; an expansion chamber; a compensating diaphragm between said compensation chamber and said expansion chamber, said expansion chamber having a support surface extending at a spaced location from said compensating diaphragm; a push rod actuated by said valve drive and connecting said working diaphragm to said compensating diaphragm; and a deformation zone within said compensating diaphragm, said deformation zone being brought into contact with said support surface by admission pressure in said compensation chamber providing a reduction of an active area of said compensation diaphragm; a housing defining said admission pressure chamber, said back pressure chamber, said compensation chamber and said expansion chamber; a pressure line connecting said admission pressure chamber to said compensation chamber to communicate pressure from said admission pressure chamber to said compensation chamber; said push rod transmitting an actuating force between said valve drive, said working diaphragm and said compensating diaphragm relative to said housing.