. Catalog Air flow regulators CONSTANTFLOW RN-EX


Wester_m 14.03.2024


Mechanical round air flow controllers are designed to control supply and extract air flow for constant flow systems, ATEX approved and certified for use in potentially explosive areas

ATEX compliant design
Suitable for gases, air with high humidity and vapors in zones 1 and 2, 21 and 22
The required air flow can be set using the scale on the housing; no additional equipment is required
No on-site testing required prior to commissioning
Allowable ​air speed​ up to​ 12 m/s
Can be installed in any position
Housing tightness according to EN 1751 class C

Optional equipment

Soundproofing coating to reduce noise generated by the chassis
Additional silencer CA Series to reduce noise generated by air flow

An air flow regulator is a mechanical device that operates without an external power source. The control valve flap with bearings with a low friction coefficient under the influence of aerodynamic force is installed in such a position that, regardless of pressure differences, a constant specified air flow is maintained.

Under the influence of the aerodynamic force of the air flow, the damper closes. The inflatable compensator transmits and increases the force and at the same time reduces damper vibrations. A leaf spring, located behind the cam disc, countersacts the closing force of the valve. The cam disk is designed in such a way that when the pressure changes, the valve flaps are adjusted to maintain a constant air flow within small deviations.

Easy commissioning

The required air flow can be easily and quickly set using the adjustment knob with a pointer; no additional equipment is required.

The advantage over standard throttle valves is that there is no need for multiple valve measurements and adjustments, which are performed by a qualified specialist. If a change in pressure occurs, for example, when an air duct cross-section opens or closes, the air flow in the entire system with throttle valves will also change, while this does not happen in a system with mechanical flow regulators. Mechanical flow regulators will immediately change the position of their dampers so that the set air flow remains unchanged.

① Valve blade
② Inflatable compensator
③ Compensator inlet
④ Shaft
⑤ Leaf spring
⑥ Cam mechanism
⑦ Air flow scale stop
⑧ Air flow scale
⑨ Seal

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