40mm Plastic Foam Pump Dispenser Facial Cleanser Liquid Outer Spring Foam Pump

What is a Trigger Sprayer?

A trigger sprayer is a handheld, mechanical pumping device that dispenses a liquid in a spray, stream, or mist pattern when its trigger is squeezed. It is commonly found on bottles containing cleaning products, garden chemicals, personal care products, and more.

The key difference from a foam pump is the output: a trigger sprayer creates a spray of liquid droplets, while a foam pump creates an aerated foam.

How Does a Trigger Sprayer Work? (The Mechanism)

The operation is a classic example of a positive displacement pump utilizing a piston and one-way valves. Here’s the step-by-step process:

1. Squeezing the Trigger (Downstroke):

   • Squeezing the trigger pushes a piston forward inside a cylinder.

   • This pressurizes the liquid already in the cylinder.

   • The inlet valve (at the base of the dip tube) closes to prevent backflow.

   • The pressurized liquid is forced out through the nozzle.

2. Releasing the Trigger (Upstroke/Recovery):

   • Releasing the trigger allows a spring to return the piston to its original position.

   • This creates a vacuum inside the cylinder.

   • The vacuum closes the outlet valve in the nozzle and opens the inlet valve at the bottom of the dip tube.

   • This suction draws liquid up the dip tube from the bottle and into the cylinder, ready for the next squeeze.

3. The Nozzle: The liquid is forced through a small orifice in the nozzle. Many trigger sprayers have an adjustable nozzle that can be rotated to change the spray pattern:

   • Spray/Mist: A fine mist for wide, even coverage (e.g., for glass cleaner).

   • Stream: A concentrated jet of liquid for targeted application (e.g., for removing stains).

   • Shut/Off: A position that blocks the flow entirely for safe storage.

Many modern sprayers also feature a trigger lock to keep the sprayer on for continuous spraying without having to hold the trigger down.

40mm plastic foam pump dispenser

facial cleanser liquid foam pump

outer spring foam pump dispenser

40mm Plastic Foam Pump Dispenser Facial Cleanser Liquid Outer Spring Foam Pump Images