Today we are going to go over the differences between piston and diaphragm pumps found on backpack sprayers. Knowing the differences between the two will make it easier to select a sprayer and will help you spray more efficiently.
Solo Piston Pumps feature a cylinder housing in which a piston travels up and down to generate pressure. Most models can reach 60 psi but select models can reach 90 psi with an optional plug installed. More pressure equals smaller droplet sizes. Which is important for use with contact herbicides or other products that might require smaller droplets.
However, piston pumps are not recommended for use with wettable powders, abrasive solutions, or bleach solutions which can cause premature wear and failure of the pump.
Diaphragm pumps feature a flat diaphragm inside of a housing held together by twelve screws, inside of which a diaphragm travels up and down to generate pressure.
Because there is no contact with a cylinder wall, as with piston pumps, these tend to be more durable. Diaphragm pumps can only generate up to 60 psi. But this is often preferable for use with systemic herbicides or other products that require larger droplets for less drift. Remember that lower pressure equals larger droplets.
Another benefit of diaphragm pumps is that they can be used with wettable powders, abrasives, or even bleach solutions.
So that's the difference between piston pumps and diaphragm pumps. You can find these sprayers and parts at Gemplers.com.
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