FRL unit

Pneumatic FRL (Filter, Regulator & Lubricator) unit - How They Work

The FRL unit is always located at the air inlet of the plant. It is used for purifying and treating the compressed air. This unit consists of the following components:

Pneumatic FRL unit - components and their function

Pneumatic FRL unit - components and their function

These components you can also find within the detailed symbol.

pneumatics symbol maintenance unit

pneumatics symbol maintenance unit

The unit usually includes a pressure regulator with gauge (manometer). Since the pressure in the following sections of the plant only can be below the central system pressure, it is also called a "pressure reducer".
A fine-pored filter is used to purify the compressed air of dirt, pipe sinter from the distribution network and condensate.

An lubricator adds to the compressed air an oil mist. Oil can reduce the wear of an installation. However, if the compressed air has been lubricated once, it has to be oiled constantly , as the old oil hardens. Since the materials are getting better, newer plants can avoid oiling.

pneumatic maintenance unit

pneumatic maintenance unit


Watch also our video about pneumatics:

From the content:
0:00 Introduction Pneumatics
2:00 What is pressure?
3:09 Combined Gas Law, calculate a compressor
3:57 FRL Unit (Filter, Regulator, Lubricator)
6:49 Pneumatic circuit with indirect-operated DCV
7:33 Two-Pressure valve (Logic And valve)
8:18 Shuttle valve (Logic Or valve)
8:57 Indirect controlled systems
10:32 Pneumatic history part 1 12:26 Structure of a pneumatic circuit
12:34 Pneumatic history part 2
14:55 What is electropneumatics
17:29 Preview