The Process By Which a Trigger Sprayer Forms a Spray
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Where are trigger sprayers used? Trigger sprays are used in car wax applications, barbecue cleaners, bathroom sink, and tub cleaners, and toilet cleaners.
The main moving element of the trigger spray pump is the piston, which is installed in the cylinder. Inside the cylinder, there is a small spring. To operate the pump, you pull the trigger back and push the piston into the cylinder. The moving piston compresses the spring, so when you release the trigger, the piston is pushed out of the cylinder. These two strokes of the piston, in and out of the cylinder, constitute the entire pump cycle.
On the downstroke, the piston pushes in, reducing the area of the cylinder and forcing fluid out of the pump. The upward stroke, where the spring pushes the piston back, expands the cylinder area and draws fluid into the pump. In a spray bottle, you suck in cleaning fluid from the reservoir below and squeeze it out of the bucket above. In order for all the fluid to flow through the barrel, the pump can only push the fluid up - it cannot push the fluid back to the tank. In other words, the fluid must pass through the pump in only one direction.
In a spray mechanism, the one-way valve between the pump and the nozzle is a kind of cup mounted at the end of the barrel. On the upstroke, the inward pressure from the pump pulls the cup toward the barrel, so air cannot flow in through the nozzle. On the downstroke, the pushed fluid lifts the cup slightly from the barrel and flows through the nozzle. Without the second check valve, the pump system would not be able to draw fluid from the reservoir because there is no suction (no drop in air pressure). The upward stroke doesn't lower the air pressure inside the pump; it just sucks in more air to maintain that pressure.
Yuyao Feifan Commodity Factory is a Foam Pump Manufacturer, mainly producing lotion pumps, spray pumps, foam pumps, square guns, foam guns, and other daily products.