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Piston or Diaphragm Pump Backpack Sprayer? Which is Better?

Piston or Diaphragm Pump Backpack Sprayer? Which is Better?

Are you considering purchasing a backpack sprayer? Today’s sprayers have an abundance of options that can be a bit overwhelming if you do not know what you are looking for.  Taking the time to think ahead of the many ways you plan to use your sprayer will help you get the best piece of equipment for your investment.

Backpack sprayers have many of features to consider.

  • Tank Size: Select a tank size that is large enough for your projects, but not so large that you have extra, unnecessary weight. Large tank openings reduce spillage when adding chemicals.

  • Tank Materials: Tanks should be made of UV and corrosion resistant materials for a long life.

  • Seals & Gaskets: There are multiple types of seals based on the chemical(s) that you will be using. These parts greatly affect the life and performance of the sprayer, not to mention the prevention of leaks.

  • Comfort: Components such as shoulder straps, carrying handles and frame size will affect your comfort and fatigue level when using the sprayer.

  • Safety Features: Look for shut-off valves, with lock-on/lock-off feature, to control spray and prevent dripping.

  • Nozzles: Interchangeable nozzles allow for multiple spraying tasks.

Another key consideration is the type of pressure pump assembly that will work best for your needs. Backpack sprayers are constructed with either Piston or Diaphragm pumps – each has its benefits:

Piston Sprayers:

Piston sprayers include a cylinder housing in which, when pumping, a piston moves up and down to create pressure.

  • Most piston models can reach up to 90 psi.

  • Higher psi delivers smaller droplet size and has a further reach.

  • Use with low abrasive, low viscosity spray liquids such as herbicides and insecticides.

  • Easy to repair.

  • Not for use with wettable powders, abrasive or bleach solutions which can cause premature wear or failure of the pump.

Diaphragm Sprayers:

Diaphragm pumps feature a flat, diaphragm inside of a housing held together by screws.  When pumping, the diaphragm flexes up and down to create pressure.  These pumps tend to be more durable because there is no contact with the cylinder wall.

  • Diaphragm pumps can reach up to 60 psi.

  • Can be used with wettable powders, abrasive or bleach solutions.

  • Repairable, however, a bit more time consuming than a piston model.

All sprayers are not created equal. The next time you are in the hardware store take a look at both styles of sprayers.  Choosing the correct sprayer type will give you the best overall performance and provide service for years to come.

For information on solo sprayers visit our website at https://us.solo.global


    • Avatar
      Collier Turf Care Ltd
      Feb 7, 2018

      Thank you for the sharing us this knowledge about Knapsack Sprayer. I read your all blog, and you explain everything very well.

    • Avatar
      Mark Wolfson
      Mar 17, 2018

      Re: 475-B-Deluxe purchased from Amazon last Wednesday. I want you to know that i wasted a whole Saturday morning, unsuccessful in even being able to get the pump handle on the diaphragm rod! Either the handle or the rod is machined incorrectly and the handle holes and rod holes are offset, nothing I can do but return the unit, since you do not have warranty service listed in my area (Seattle). I could drill to make the holes wider so I can thread the bolt, but that is for you to do, not me. Thanks for wasting my precious time off.

    • Avatar
      Jul 22, 2018

      Thanks for the info on the difference between piston and diaphragm pumps, it was helpful!

    • Avatar
      Karan Doshi
      Oct 29, 2018

      The information provided is very useful. Thank you for providing information about the difference between piston and diaphragm pump.

    • Avatar
      Sonal Kumar
      Jul 10, 2019

      Such a wonderful blog to read really valuable information given thanks for this keep sharing more

    • Avatar
      Sonal Kumar
      Jul 10, 2019

      Such a wonderful blog to read really valuable information given thanks for this keep sharing more

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