Spray triggers are really simple to design and rely on a few elements to reach their goal of delivering liquid as a spray through the bottle. A small pump is activated once the trigger lever is pulled using a few fingers. Using the pump, fluid is pulled from the bottle’s reservoir through a plastic tube. Through a narrow barrel, the liquid is forced to a spray valve, out of a small hole.
Once the trigger is pulled, the shroud contains a small spring that compresses the fluid. During the firing of the trigger, the piston pushes the spring into compression and when it is released, it is pushed back out of the gasket. As the piston travels back and forth, it moves the cylinder out once again, contributing to the entire pump cycle.
The cylinder shrinks as a result of this extraction motion, which forces the fluid out in a one-way flow. As soon as the trigger is released, the motion allows the process to continue without any issue. A variation of designs varies from pump to pump and delivery system to delivery system.
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