Gravity feed and Suction spray guns
In this section we will show what Gravity feed and Suction spray guns are used for and best use for them.
The selection of spray guns will regard to work volume air pressure, compressor capacity, and the type of work intended.
Spray guns usually have provision for fitting different air cap, fluid needle and fluid cap combinations, to suit the various materials used. Spray guns are of the separate container or attached container types and these two types can be further divided into suction, gravity or pressure feed, bleeder and non-bleeder, external and internal mix guns.
The most common are Gravity and suction,
Gravity feed spray gun
Suction feed guns are used where there are many colour changes and they are the most popular in the car refinishing industry. Gravity feed the gravity feed gun is suitable for spraying small quantities of viscous material. It is fed by force of gravity from the paint cup attached to the top of the gun body. The gravity feed gun uses the same air cap and fluid nozzle combination as the suction feed gun.
The suction feed spray gun with 1 litre cup and an air consumption of approximately 0.34 m3/min (12 ft3/min) at an operating pressure of 3.85 bar (55 psi) used in conjunction with a fluid cap of 1.8 mm (0.070 in) to deliver approximately 250 cc of paint per minute, depending on the viscosity and settings. This is a type of spray gun in which the stream of compressed air siphons material from the container attached to the Suction feed spray gun.
