Degree of machine contamination

The requirement for a high-pressure system is strongly determined by the degree of machine contamination. With the development of the following symbols we want to allow you to find out the right high-pressure unit with respect to the machine contamination level – more or less at a glance. Due to various possible flow rate and filtration configurations, our high-pressure units can be the right choice for multiple requests. Basically, we distinguish three different degrees of machine contamination resulting from the chip volume and chip types within your machining processes.

Degree of machine contamination (in relation to fine / rough chip) High pressure filter concept (CL and CS) Chip conveyor concept (combistream) Process flow
(empirical values)

Müller symbols

20% fine chip
80% rough chip
Exchangeable filter 25, 40 or 60 µm BK10
  • Filter cleaning (change) up to once a month
  • Cleaning of machine tank up to once a quarter
40% fine chip
60% rough chip
Exchangeable filter as twin filter 25, 40 or 60 µm BK20 (slotted screen 500 µm)
  • Filter cleaning (change) possible several times a month
  • Cleaning of machine tank  up to once a quarter
60% fine chip
40% rough chip
(more wooly chips, fine chips aluminum  and brass)
Automatic filter 30, 40 µm BK20 (slotted screen 300 µm)
  • Filter cleans  automatically
  • Cleaning of machine tank up to three times a year
80% fine chip
20% rough chip
Automatic filter 30, 40 µm BK30
  • Filter cleans automatically
  • Floor cleaning of machine tank (manual cleaning max. twice a year)
100% fine chip
0% rough chip
(extremely high milling rate)
Automatic filter 30, 40 µm BK11 (slotted screen 500 bzw. 300 µm)
  • Filter cleans  automatically
  • Cleaning of machine tank up to once a quarter