Abstract: A disposable syringe assembly 10 including a cylinder body 12, a needle assembly 14, a piston assembly 16, a rear seal assembly 18, a hollow shaft 20, and a valve assembly having a valve port 61 and valve seals 49. The needle assembly may be releasably engaged with the cylinder body. The body and the piston assembly moveable within the body may define each of a fluid chamber 74 and an annular chamber 28. As fluid is drawn into the fluid chamber by movement of the piston assembly, air may be displaced from the annular chamber through the valve assembly. As fluid is discharged from the fluid chamber, the valve assembly may be closed and a vacuum created in the annular chamber. A valve positioner may control connector connectivity and valve port position. Near the end of the fluid discharge piston stroke, a connector 88 engaged with either the shaft of with the piston assembly may engage selectively engage a mating connector on the needle assembly. The needle assembly may be disengaged from the body.

Abstract: A disposable syringe assembly generally including a cylinder assembly 10, a needle assembly 20, a piston assembly 30, a seal cap assembly 40, a piston stem 50 and handle 60. The cylinder assembly 10 may be engaged with the needle assembly 20 substantially near the needle end of the cylinder assembly 10 and the cylinder assembly may be engaged with the seal cap assembly 40 near the seal cap end of the cylinder assembly 10. The cylinder assembly 10 may further including a fluid region 14 and an air region 15. As fluid is drawn into the fluid region 14 by movement of the piston assembly 30, air is displaced from the air region 15 through a one-way valve. As fluid is discharged from the cylinder assembly 10, a low pressure is created in the air region 15.

Abstract: A drift influencing composition for use with agricultural chemicals for aerial distribution to farm crops or the like comprising a quantity of water soluble friction reducing resin, high molecular weight (300,000 to 4,000,000) polyethylene oxide in solution with water in the concentration range of 70 parts per million by weight to 200 parts per million by weight to retard the drift of aerial sprayed agricultural chemicals, and in the concentration range of one-half parts per million by weight to 70 parts per million by weight to enhance the drift of aerial sprayed agricultural chemicals, which functions to reduce surface tension of the solution and enhance efficient aerial spraying and providing sufficient coagulation to minimize wind induced drift.