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Mechanical purge spray guns are popular among spray foam contractors for interior and exterior spray foam insulation. Mechanical purge spray guns work by a piston attached to a valving rod. Air is used to actuate the piston moving the valving rod through a mixing chamber. In the non-triggered position, the valving rod halts the material flow. When triggered, the piston moves the valving rod and the material is mixed and dispensed. Spray foam insulation is manufactured through the spray gun. Using an air purge spray gun or a mechanical purge spray gun is a matter of preference.
How PMC's PX-7 is New and Improved
There are two basic types of spray guns: Air Purge and Mechanical purge. Air purged spray guns are popular among spray foam contractors for interior and exterior spray foam insulation applications. Air purged spray guns (shown in photo) work by a piston attached to a mixing chamber. Air is used to actuate the piston and purge the mixing chamber. In the non-triggered position, air is constant. When triggered, the air supply, traveling through the mixing chamber, is halted and replaced with the A and B chemicals. The material is then mixed and dispensed. The spray foam insulation material is manufactured through the spray gun. When the trigger is released, the material supply is halted and replaced with air, purging the mixing chamber. While the basic principles of the spray guns are the same, the designs differ. Each has its own merits. Consult with a distributor or a supplier for specific uses.
View the Service Manual for the PX-7
View the Brochure for the PX-7
Standard features include:
- Mechanical Self-Cleaning
- Solvent Free
- Airless Atomizer
- Internal Impingement
- Machine Coupling Block
- Rebuildable Manual Values
- Stainless Steel Hardened Gun Block
Mechanical Purge: PX-7 incorporates a valving rod to mechanically purge the mixed material from the mixing module at the end of each shot; eliminates the need for solvent flushing or air purge.
Hand-Honed One-Piece Valving Rod: In addition to tight tolerance manufacturing of the one-piece valving rod, the PMC PX-7 valving rod is then hand honed, in the areas that mate with the mixing module, thus improving the life of the module.
Internal Impingement: Mixing module is designed for long service life. A large variety of styles are available to be used in conjunction with various pattern control discs to provide the highest level of mixing and pattern development.
Machined Coupling Block: PX-7 comes standard with a precision machined coupling block made from high strength steel.
Rebuildable Manual Valves: PMC has included the latest innovation in rebuildable manual valves on the PX-7 guns that are sturdy, simple and economical to rebuild.
Stainless Steel Hardened Gun Block: More durable cast gun block. The PX-gun block is made from Stainless Steel and is then hardened for long life, minimum wear and provides a positive and robust connection for the coupling block screw.
Check Valves: Easy removal of check valves from Side Screen Screws for maintenance and cleaning.