Sprūda smidzinātājus ir ļoti vienkārši konstruēt, un tie paļaujas tikai uz dažiem elementiem, lai sasniegtu savu mērķi izsmidzināt šķidrumu caur pudeli. Kad sprūda svira tiek pavilkta ar dažiem pirkstiem, tiek aktivizēts neliels sūknis. Sūknis caur plastmasas cauruli izvelk šķidrumu no pudeles rezervuāra. Šķidrums tiek izspiests caur šauru mucu un no neliela cauruma tiek izspiests smidzināšanas vārstā.
When the trigger is pulled, a small spring in the shroud compresses the fluid. The piston compresses the spring during trigger firing, and when it is released, it is pushed back out of the gasket. As the piston moves back and forth, it pushes the cylinder out, contributing to the pump cycle.
As a result of this extraction motion, the cylinder shrinks, forcing the fluid out in a one-way flow. The motion allows the process to continue without interruption as soon as the trigger is released. Design variations vary from pump to pump and delivery system to delivery system.
