Patent ID: 6913209

Claim:
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 that at least partially defines a first passage and a second passage, said valve being moveable between an open position and a closed position, said valve configured such that when said valve is in said open position said first passage is in communication with said lower portion of said chemical passage and said second passage is in communication with said carrier fluid passage, said valve also configured such that when said valve is in said closed position said first and second passages are not in communication with said carrier fluid passage and said lower portion of said chemical passage, said valve comprising at least one sealing portion that is 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; a vent passage that is in communication with said cavity, said valve being configured such that when said valve is in said closed position a surface of said at least one sealing portion prevents said cavity from being in communication with an atmospheric pressure source through said vent passage; and the valve comprising a handle that forms a gripping surface, the gripping surface of the handle being configured such that there is no relative movement between the gripping surface and the at least one sealing portion as the valve is moved between the first position and the second position.