Pneumatic actuators designed to withstand acidic and corrosive atmospheres

The treatment and coating of the surface of the materials used to manufacture Genebre's pneumatic actuators give them magnificent properties that allow them to work in acidic and corrosive environments.

Valve automation and the use of valves in the chemical and petrochemical industry requires special care in the selection of the materials used in the manufacture of all parts, as well as definition of the best valve surface protection.

Not only is it important to bear in mind the type of fluid circulating through the pipe, but it is also necessary to take into account the environmental conditions where the automated valve is to be installed.

One of the most widespread problems is surface impairment, which occurs with some materials, including aluminium, when exposed to acidic or saline atmospheres. Aluminium, a basic raw material in the manufacture of pneumatic actuators, degrades in certain types of atmospheres, causing “aluminium oxide” to be produced in the actuator body. The result is that the unit soon becomes unfit for use.

Because of this, Genebre, the leading global producer of valves and fluid control fittings has augmented its Industrial Line with a rack and pinion actuator featuring an ASTM 6005-compliant extruded aluminium body. This actuator features a hard anodic coating to protect against internal and external corrosion, a fine internal cylinder finish to ensure a low friction coefficient, and a polyester powder paint outer coating that significantly extends the life of the actuator, even when it is exposed to severe atmospheric conditions.

In addition to affording optimal mechanical features, polyester powder paints provide excellent resistance to UV light, chalking and chemical agents. These paints are commonly used for products designed for outdoor applications.

Published in: FuturENVIRO Nº 69 April-May 2020