Maintenance After An Explosion; Noise Level; Atex Certification; Potentially Explosive Atmosphere - Formula Air Rva-X Serie Wartungshandbuch

Step 3 : unscrew the 4 bolts holding the bearing in place and remove the bearing (if needed),
Step 4 : put the new bearing back using a bit of copper grease on the rotor shaft,
Step 5 : screw the new disk back on,
Step 6 : put the rotation disk protection cover back on and tighten the 4 bolts.
5.5

Maintenance after an explosion

If an explosion has occurred, it is imperative to make a visual inspection by an approved maintenance team.
A complete inspection is mandatory to make sure that the rotary valve has not suffered damages such as : cracks,
deformation, loss of components. Also, the airtightness of the rubber blade vanes needs to be checked before starting
the installation.
Any damages, warping or notable changes will be subject of replacement parts or complete valve (see point 7).
CAUTION !
Before starting inspection or maintenance operations on the RVA-X ATEX rotary valve, you must secure the zone,
make sure that that system is switch off, and that it is impossible to inadvertently set it back in operation.
5.6

Noise level

The noise ratio of the component in our scope of supply in connected condition and without media is below 75 dB(A)
measured at 1 meter from the component.
Noise from transported media is not included.
IMPORTANT !
A higher noise level may occur depending on local conditions, transported material and other components connected
to the RVA-X ATEX rotary valve. In this case separate measurements may be required.
If the total noise level in the area exceeds 85 dB(A), hearing protection must be used.

6. ATEX certification

This symbol indicates information concerning the directive ATEX 2014/34/EU.
All information preceded by this symbol must be executed by highly qualified personnel, competent in
safety environments regarding to environments characterized by the presence of potentially explosive
atmospheres.
6.1

Potentially explosive atmosphere

An explosive atmosphere for the purpose of Directive 2014/34/EU is defined as a mixture with air, under atmospheric
condition, of flammable substances in the form of gases, vapors, mists or dusts in which, after ignition has occurred,
combustion spreads to the entire unburned mixture.
A potentially explosive atmosphere is an atmosphere which could become explosive due to local and operational
conditions.
In carrying out the obligations laid down in Directive 99/92/EC, hazardous environments are classified in terms of
zones based on the frequency and duration of the occurrence of an explosive atmosphere.
6.1.1

Dangerous areas classification

For Gas :
Zone 0 : An area in which an explosive atmosphere consisting of a mixture with air of flammable substances in the
form of gas, vapor or mist is present continuously, frequently or for extended periods of time.
Zone 1 : An area in which an explosive atmosphere consisting of a mixture with air of flammable substances in the
form of gas, vapor or mist is likely to occur occasionally in normal operation.
Zone 2 : An area in which an explosive atmosphere consisting of a mixture with air of flammable substances in the
form of gas, vapor or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period
only.
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User manual | RVA Rotary valves ATEX
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