Diaphragm Pump, They can work as a basic misting pump for humidification or cooling.

I am cost conscious.

A diaphragm pump is an inexpensive pump that can provide pressure up to 150 psi.

Lower pressure 1/4in slip-lock nozzles work at 125-150 psi.

Can a diaphragm pump provide a cost effective solution to misting?

Some benefits

  1. Cost effective compared to positive displacement pumps (PDP).
  2. Can run dry - allot longer than PDP.
  3. Small in size.
  4. They have a built in cut in and cut out pressure switch.
  5. They have enough capacity, typically 1.0 GPM.

What would have to be overcome?

  1. Pressure regulation
  2. Short cycling (important)

Optional control for consideration.

  1. Dump Valve
  2. Input solenoid
  3. Output Solenoid
  4. Gauges

Diaphragm pumps have a built in pressure switch. The high pressure units switch at 150 to 160 psi.

Before I put a complete system together let's do some testing. I put together a basic setup.

Test Diaphragm Pump Mister

Works well.

If you want to experiment with a higher pressure system for humidification or outdoor cooling this is as inexpensive as it gets.

Mist was good out of 0.20mm nozzles and up. Droplet size looked the best (smallest) with the 0.20mm nozzles. You could tell the droplet size was getting bigger when nozzle size was increased.

<a href="http://www.linkedtube.com/_cEVM6ak7Gkfeb150d74b89054e7c5f6c69ee893e9d.htm">LinkedTube</a>

Pump actually put out a gallon a minute. Not a gallon an hour as stated in the video.


With the pump off source water does not flow through the pump. Solenoid prevents that.

Remember, misting nozzles have check valves built in. So when you shut the pump off the nozzles checks stop water flow.

<a href="http://www.linkedtube.com/F5NTRXNlwrs400a4ab7a147fbc9e82b62dd43c64b0c.htm">LinkedTube</a>

I you want to try it out here a couple options on eBay.

  1. Diaphragm Pump
  2. Diaphragm Pump with Solenoid and Gauges

I have a variety of packages in mind. They will eventually get on this site.

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