Function:

• When the blower is started from an idle position, an initial axial movement is required to open the valve and admit the blowing medium to the element.
• The element contains an arrangement of convergent-divergent nozzles to direct the blowing medium on the surfaces to be cleaned.
• A combined axial and rotary movement is then generated by the sleeve drive mechanism to achieve the design blowing arc.
• The valve is closed by reversing the mechanism back to its rest position.

Special features:

• built for durability:  all moving parts enclosed; flexible coupling used where required for differential expansion; gas tight wallbox
• minimal maintenance: gearboxes are sealed for life, requiring no in-service lubrication 
• simple installation: blower mounts directly into wallbox and requires no external support structure; special companion flanges not required; suitable bearings are supplied for clamping or welding to the boiler tubes to provide support for the element
• minimal number of moving parts
• emergency manual operation using crank handle

Options:

• integrated stop valve with external settings of throttle disk
• special wall box designs for negative pressure, positive pressure and sound protection 
• sealing and scavenging air with lateral duct compressor 
• articulated blowing tube joint