Patent ID: 8316478

Claim:
An emergency eyewash unit, comprising: eyewash means defining at least a pair of water discharge ports oriented for upward projection therefrom of a pair of laterally opposed and angularly diverging flush flow water streams in opposite directions for inside-out flush flow of contaminants from a person's eyes; and a shower including a shower head, said shower head including a nozzle subassembly including a nozzle body having an axial flow passage therethrough, a resilient flow control element mounted along said flow passage for regulating water flow therethrough to a substantially constant flow rate within a range of water supply pressures, a relatively non-flexible flow control positioning spacer washer mounted along said flow passage downstream from said flow control element and having central flow port therein for water passage therethrough, a diffuser disk mounted along said flow passage downstream from said spacer washer and cooperating therewith to define a mixing chamber, said diffuser disk having a flow port formed therein having a diametric size less than the diametric size of said central flow port formed in said spacer washer, said diffuser disk further having a plurality of radially outwardly projecting swirl vanes defining therebetween a corresponding plurality of angularly set swirl passages, whereby water flowing through said diffuser disk passes through said diffuser disk flow port and also through said swirl passages, and means defining a nozzle orifice downstream from said diffuser disk, said nozzle orifice having a diametric size greater than the diametric size of said diffuser disk flow port.