PRES­SURE REG­U­LA­TION

Model Rail (UK) - - Skills Station -

As al­ready men­tioned, some way to con­trol the air pres­sure is vi­tal and, thank­fully, most modern com­pres­sors aimed at the mod­el­ling mar­ket now of­fer some form of con­trol as stan­dard, or as an op­tional ex­tra. Con­trol may be in the form of a knob on the com­pres­sor or as part of an in­te­gral mois­ture fil­ter and/or bleed valve (see be­low) fit­ted to the com­pres­sor’s air out­let. Al­ter­na­tively, an ‘in-line’ option is avail­able, con­sist­ing of small con­nec­tors that fit be­tween the air­brush and hose. These work by bleed­ing a con­trolled amount of ex­cess air out of the hose, thus re­duc­ing the pres­sure at the air­brush.

A com­pres­sor with a reser­voir tank of­fers a smooth air­flow and keeps noise and me­chan­i­cal wear to a min­i­mum.

Right: Some form of pres­sure reg­u­lat­ing con­trol is a must, while a pres­sure gauge is de­sir­able.

Above: Com­bined pres­sure reg­u­la­tors, gauge and mois­ture fil­ters are avail­able as sep­a­rate units that sim­ply con­nect into the air line.

Left: A cheap al­ter­na­tive is to fit an in-line pres­sure con­trol valve be­tween the air­brush and hose.

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