Stealth pumps provide pressure without noise

A novel range of 'stealth' pumps is claimed to be 20dB(A) quieter than pumps with traditional fan-ventilated motors.

Wilo-Salmson has unveiled a range of 'stealth' pumps that are up to 20dB(A) quieter than pumps with traditional fan-ventilated motors.

The latest centrifugal multistage pumps are ideal for boosting water in buildings where noise may be an issue; typical examples include hotels, libraries, museums, theatres and other public areas.

Known as the Wilo-Multivert-MVIS series, the high-pressure centrifugal pumps have no noisy fans to keep their motors cool.

Instead, the shaft and bearings are constantly exposed to - and cooled by - the water they are pumping.

This type of wet rotor design not only removes the need for a noisy fan but is also an extremely efficient means of cooling the motor.

Unlike some other low noise pumps, the Wilo-Multivert-MVIS series can be mounted vertically.

As a result, it's easy to install MVIS series pumps wherever it is most convenient and efficient.

'Maintenance free' has been a guiding principle in the development of the Wilo-Multivert-MVIS series.

The pumps are ruggedly constructed with stainless steel impellers, diffusers and pressure casings, and the wet rotor design, with a single shaft for both motor and pump, is effectively 'sealed for life'.

And, of course, there are none of the external moving parts normally associated with fan-cooled motors.

The Wilo-Multivert-MVIS series boasts a flowrate up to 14m3/h and up to 110m head.

The pumps are available in three ranges - the MVIS 200, MVIS 400 and MVIS 800 - and can be supplied with either the standard female threaded or Victaulic connections.

(This was Engineeringtalk's Top Story on 10 July 2002).

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