The APD uses a 23:1 ratio RAM pumping unit to proportion materials in excess of 1,000,000 centipoise.  The pump is equipped with an air motor control valve to prevent static build-up of line pressure.  This will prevent the bursting of glass spheres. Normal operating pressure ranges from 200 to 300 PSI.

With high viscosity polyester putties, it is critical to have a durable and accurate catalyst delivery.  The APD does not use a series of mechanical links that position the catalyst pump and feed bottle directly over the drum of putty.  The APD is designed with a hydraulic cylinder attached to the RAM pump, which is connected to a second hydraulic cylinder affixed to the catalyst pump linkage mechanism.  The catalyst pump is mounted on a mast, not over the drum of putty.  The hydraulic linkage eliminates multiple pivot points that can reduce accuracy.

The APD dispense gun has several unique features...

• Catalyst is integrated with the putty from three directions prior to entering the static mixers.  This eliminates a "candy cane" mix and also the lead/lag of catalyst when starting and stopping the dispense.
• The gun has solvent and air flush for quick and economical cleaning.
• The static mixer tube is connected with compression fittings so it can be quickly disassembled for maintenance and routine service.
• The catalyst valve automatically opens, via an air signal, as soon as the polyester putty valve is opened.

The APD also includes several additional features such as...

• Silicone RAM for easy clean-up and long life
• Drum lock downs