Patent ID: 6672520
Filing Date: 2004-01-06
Classification: B05B,F16K

Abstract:
A chemical sprayer comprising a sprayer head assembly and a container that defines a cavity for storing a chemical to be sprayed; said sprayer head assembly comprising:a chemical passage that is in communication with said cavity, a lower portion of said chemical passage being defined at least in part by an elongated tubular member that extends into said cavity; a carrier fluid passage that is in communication with a carrier fluid source; a valve chamber that is in communication with said chemical and carrier fluid passages, a valve moveably positioned within said valve chamber and rotatable about an axis, said valve at least partially defining a first passage and a second passage, said first passage is configured so as to be in communication with said lower portion of said chemical passage when said valve is in an open position, said second passage is configured so as to be in communication with said carrier fluid passage when said valve is in said open position, said first and second passages also configured so as to not be in communication with said lower portion of said chemical and carrier fluid passages when said valve is in a closed position; said valve further comprising at least one sealing portion rotatable about said axis, said sealing portion positioned so as to block both the chemical and the carrier fluid passages when said valve is in said closed position such that said lower portion of said chemical passage is no longer in communication with said first passage; and wherein said assembly further includes a vent passage that is in communication with said cavity and spaced from said chemical passage, said valve being configured such that when said valve is in said closed position a surface of said at least one sealing portion blocks said vent passage to prevent said cavity from being in communication with an atmospheric pressure source through said vent passage.