B01F5/0678 - CPC Classification

• B01F5/0679 » {the surfaces being maintained in a fixed position, spaced from each other, therefore maintaining the slit always open} 8
• B01F5/068 » {the surfaces being maintained in a fixed but adjustable position, spaced from each other, therefore allowing the slit spacing to be varied } 23
• B01F5/0681 » {the surfaces being part of a valve construction, formed by opposed members in contact, e.g. automatic positioning caused by spring pressure} 23