Patent ID: 7325752

Claim:
A chemical sprayer comprising a sprayer head assembly and a container that defines a cavity for storing a chemical to be a sprayed, said sprayer head assembly comprising: a chemical passage that is in communication with 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 at least partially defining a first passage and a second passage, said first passage is configured so as to be in communication with 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 chemical and carrier fluid passages when said valve is in a closed position; said valve further comprising one or more sealing portions positioned so as to block both the chemical and the carrier fluid passages when said valve is in said closed position; a vent passage that is in communication with said cavity and has an opening in said valve chamber; and a sealing pad actuated by said valve to seal said vent passage, the sealing pad including a biasing portion positioned in the valve chamber, the biasing portion biasing a portion of the sealing pad away from the opening of the vent passage; wherein the sealing pad extends to an exterior of the chemical sprayer.