Patent ID: 6959722
Filing Date: 2005-11-01
Classification: F04F,F16K,Y10T

Abstract:
1. A device for adjusting the degree of vacuum in an apparatus for collecting substances by suction, comprising: a chamber; a valve with a body that is provided with a sealing surface and with a first air flow port connected to atmosphere at one end and to said chamber at the other end; a vacuum source, said chamber being connected to said vacuum source and to said collection apparatus; a permanent magnet; supporting means associated with the body of the valve in an adjustable position so as to allow arrangement of said magnet at different distances with respect to said sealing surface; and a flow control element provided so as to be attracted into a closed position in abutment against said sealing surface by action of said magnet, wherein said supporting means comprises a ring that is associated with the body of the valve by way of a thread thereof, said ring comprising ribs connected to a central hub for accommodating said magnet, said ribs forming air passage channels.