A spray gun for spraying fluent materials comprising a valve chamber, a nozzle connected to the chamber at one end thereof, inlet and outlet ports communicating with the valve chamber, and a valve element having a hollow interior displaceable in the chamber between closed and open positions. The valve...http://www.google.com.au/patents/US5553788?utm_source=gb-gplus-sharePatent US5553788 - Spray gun assembly and system for fluent materials
