Learn How a Spray Foam Machine Works

A Hydraulic Spray Foam and Coating Machine Needs 5 Key Elements to Function

1). 220V/240V Single Phase or Three Phase Power Supply

2.) Air Supply, 100 PSI @ 17cfm

3.) Transfer Pumps

4.) Heated Hose

5.) Spray Gun


The machine is powered with and electric source 220v/240v to energize the control panel, hydraulic system and the heating system.


The machine will need to be supplied with materials; this is done by using transfer pumps to move the materials from 55 gallon drums to the machine. The transfer pumps are powered by air.


The materials are then pumped through a Y filter mounted to the main proportioner pumps at the machine to pre-screen any contaminants.


The A and B materials are then pressurized with the main proportioner pumps by an electric motor driving a hydraulic pump. (The Drive System).


The main proportioner pumps are double acting, creating positive displacement of material on both strokes.


After the materials are pressurized they are sent through a hose into heater blocks called (Pre-Heaters).


The Pre-Heaters are to set the (A) and (B) material temperatures to manufactures specifications.

Typical setting (pending manufactures) are 120F for closed cell foam and 130F for open cell foam.

From the Pre-Heaters the materials pressures are read with the pressure gauges and out to the spray hoses. Typical pressure settings starting around 1,000 psi.


The hose is to maintain the temperatures set at the Pre-Heaters to the manufactures specifications.

The red side of the hose is the (A) side material and the blue side of the hose is the (B) side.

Attached to the end of the hose is a temperature sensor unit called the (TSU).

The TSU senses the temperature of the material in the hose to show temperature at the control panel as well as to allow adjustments.


The heated hose gets power from a transformer located at the base of the machine.

Click here for our guide on How to Choose the Right Hose for your Machine.

The transformer has tap setting to allow for different lengths of spray hose.


The materials are kept separate until they reach the spray tip in the spray gun.

There are different types of spray guns; in this case we will use an AP-1 air purge gun.

The air purge gun is designed and powered by air to pull back the spray tip once the trigger is engaged allowing the (A) and (B) materials to be mixed at a 1:1 ratio.


Once the materials are mixed in the spray tip and the guns trigger is released, air purges through the mixing tip to clear the residual materials out.

Learn more about spray foam coating equipment.