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Areas
Of Application:
The MAHR rotary valves are designed for the measured discharge
of powdered bulk goods from silos or bins. According to application,
the cast housings are hard-chrome plated inside or as sturdy welded
construction. Steel or stainless steel bucket wheels with 8-10 partially
slanted cells guarantee quiet running and high operational safety.
For the drive, flanged gear motors connected directly via a coupling
or through a chain reduction unit are available. Varying rotational
drive speeds and chain gear ratios, hand adjustable control gears
or frequency controlled motors permit a fine gradation of the discharge
output. Rotary valves type SZR are suitable for discharge
quantities up to 36 m3/hr. Because of their Vulkano gasket moldings
this type is especially suited for the attachment of a blow-out
shoe. Even very small quantities can be dosed via special bucket
wheels. Discharge outputs up to more than 300 m3/hr. are facilitated
with the series types N and UL. Large-dimensioned roller bearings
with radial seals and slanted rotor blades guarantee quiet running
and little blockage of the rotor. The type UL with external
bearings is suitable for the dosing of hot and abrasive bulk goods,
such as, for example, fly-ash and cement. The external bearings
guarantee longer service life.
Operation:
Rotors with 8-10 cells dose the bulk goods and the rotational speed
of the drive motor determines the dosing quantity. A change in the
dosing quantity can be effected via a change of the chain wheel,
a hand control unit or with frequency controlled motors. Bulk goods
can be blown optimally in a low-pressure environment via blow-out
shoe and leaking-air removal. It is possible that 100% filling of
cells is not reached; this depends on the bulk goods and their flow
properties.
Material
/ Design:
Rotary valves of type SZR with cast housing and rotor blades
for small to medium discharge quantities are made of steel or stainless
steel. Type N and UL rotary valves are hard chrome-plated
inside with ground cast iron housings and rotor blades of steel
or stainless steel and with slanted rotor blades. Sizes 200/620
and 300/650 are of heavy, welded construction. Lacquering is hammertone,
silver grey; other finishes on request. Technical Data: Rotary valves
with the motor placed above the chain wheels permit a short building
style. Rotary speed control and large-sized motors with temperature
control via posistors assure operational safety.
Advantages:
• Permanently lubricated ball bearings
• Quiet running due to slanted cells of the bucket wheel
• Wear protection through hard-chrome plating
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