Pumping and spraying system for heavy materials

A plural component spray gun for spraying heavy filled viscous fluid comprising;

• a source for supplying a heavy filled viscous primary fluid;
• a fluid nozzle for spraying said primary fluid and a secondary fluid;
• first conduit means for delivering said primary fluid to said fluid nozzle;
• second conduit means for delivering said secondary fluid to said fluid nozzle;
• primary valve means in said first conduit means for delivering said primary fluid to said fluid nozzle;
• said first conduit means including a chamber surrounding said primary valve means and a first conduit intersecting said chamber immediately adjacent said primary valve means;
• diversion conduit means intersecting said first conduit means for diverting said primary fluid;
• said diversion conduit means intersecting said chamber upstream from said first conduit;
• whereby when said primary valve means is open said primary fluid is delivered to said fluid nozzle and when said primary valve means is closed said primary fluid is diverted into said diversion conduit means for recirculation back to said source.

A system for pumping and spraying a heavy filled viscous fluid comprising;

• a source of a heavy filled viscous fluid;
• pump means for pumping said viscous fluid;
• spraying means connected to said pump means for spraying said viscous fluid, said spraying means comprising;
• a spray gun having a fluid nozzle for spraying said viscous fluid;
• a chamber in said spray gun for receiving said viscous fluid;
• a first conduit for delivering said viscous fluid to said chamber in said spray gun;
• primary valve means in said chamber for releasing said viscous fluid to said nozzle;
• second conduit means intersecting said chamber near said primary valve means for diverting said viscous fluid back to said source of viscous fluid when said primary valve means is closed;
• said second conduit means including substantially preventing diversion of said viscous fluid when said primary valve means is open;
• whereby substantially all said viscous fluid is delivered to said fluid nozzle when said primary valve means is open and said viscous fluid is diverted into said second conduit means for recirculation back to said source when said primary valve means is closed.

A plural component spray gun for spraying heavy filled viscous fluid comprising;

• a fluid nozzle for spraying a viscous fluid delivered to said spray gun;
• a chamber in said spray gun for receiving said viscous fluid;
• a first conduit for delivering said viscous fluid to said chamber in said spray gun;
• primary valve means in said chamber for delivering said viscous fluid to said fluid nozzle;
• second conduit means intersecting said chamber for diverting said viscous fluid back to a source;
• said second conduit means including diversion preventing means for substantially preventing diversion of said viscous fluid when said primary valve means is open;
• whereby when primary valve means is open said viscous fluid is delivered to said fluid nozzle and when said primary valve means is closed said viscous fluid is diverted into said second conduit means for recirculation back to said source.