Spray nozzle

摘要

A spray nozzle 300 includes a nozzle body 310, a swirl element 314 and an orifice disc 312. The nozzle body defines a central bore which extends between a fluid receiving section and a fluid discharge section and includes an interior locating surface 322 for the swirl element and the orifice disc. To ensure that the swirl element and orifice disk can be easily replaced once the adapter 318 is unscrewed from the nozzle, the nozzle is provided with a removable locking plate 332, including a captured peripheral O-ring 342, which can be inserted into the upstream end of the nozzle bore and locked in place by the captured O-ring 342 engaging with shallow ring recess 360 to thereby hold the swirl element and orifice disk in correct position and compress the sealing gasket 311 to the desired degree, before the nozzle is reassembled to the adaptor 318. In an alternative embodiment the locking plate takes the form of a bar-shaped element which can be rotated to engage with opposite bayonet type recesses in the inner surface of the nozzle bore and hold the swirl element and orifice disk in place.