Spare Parts of Flame Spray Gun

There are some spare parts used in a flame spray gun and these are-

  • Air Cap.
  • Air Cap Body.
  • Nozzle Nut.
  • Nozzle.
  • Siphon Plug.
  • O-Ring.

What Is Flame Spray

Flame spraying is mostly used to apply abrasive coatings or nickel/chrome self-fluxing alloys, which are then heat treated to metallurgically bond to the substrate (Fused coatings). A Flame Spray gun creates a flame with oxygen and fuel gases into which powder is injected. To create the coating, molten powder particles are projected onto the work piece.

Siphon Plug

Wire comes first in the siphon plug and then in the shot / sand blasting nozzle, it completely holds the wire. The siphon plug should be cleaned occasionally. Wipe out the grooves and clean out the holes with the proper size wires from the cleaning wire kit. Do not wash the o-rings with a cleaning solvent. Examine them for damage and replace them if required. Do not stretch new o-rings more than necessary. Lubricate all o-rings before reassembling the siphon plug.


In the thermal spray gun, there is a nozzle after the siphon plug. Whenever a nozzle is put on the gun, the bore of the siphon plug should be wiped clean and put on the nozzle O-rings. The nozzle nut must be tight on the siphon plug. Firm tightening by hand is sufficient. Overtightening the nozzle nut can cause damage. Clean jet holes with the proper size wire from the removing wire kit. From the back end, blow out the holes with compressed air.

Nozzle Nut

Nozzle nut is bolted after nozzle. This is used to tightly hold the nozzle in the gun body and completely fit the wire.

Air Cap

Air cap is fitted after the nozzle nut, this is a front tip or cover of the gun.

O Ring

The O ring is a rubber part that prevents leakage in the gun. The front-end hardware includes the siphon plug, nozzle, nozzle nut, air cap, and air cap body. The wire passes through the center of these parts. The siphon plug, nozzle, and air cap are determined by the spraying application. Front-end hardware selection is determined by combustion gas, wire size, wire type, and the duration of continuous spraying.


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