Aerosol valve for low delivery rate

Claim 1

A low delivery rate aerosol valve comprising a valve body including a valve body cavity and a valve body restricted feed orifice, a valve stem including at least one inlet orifice and a discharge passage, said valve stem movably mounted within said valve body cavity, a spray nozzle defining a terminal orifice in fluid communication with said valve stem, a biasing means to normally bias said valve stem to the closed position, and a valve body extension defining a plurality of expansion chambers, each of said expansion chambers interconnected to its adjacent expansion chamber by a restricted feed orifice, said expansion chambers communicating in series with the interior of said valve body cavity through said valve body restricted feed orifice such that upon actuation of the valve the contents of the dispenser pass in series through the restricted feed orifices and expansion chambers of said valve body extension, said valve body restricted feed orifice, said valve body cavity, said inlet orifice and discharge passage of said stem and said terminal orifice to the atmosphere, whereby the contents of the dispenser are delivered at a low rate.