Filter Regulator combine an air filter and air regulator in a single unit. They are designed to remove solid and liquid contaminants from air, while also providing controlled, consistent air pressure.
How does a filter regulator work?
Here, we must consider the basic working principles of the individual elements of the filter and regulator:
Filter: The filter body has a construction that creates a cyclonic action for the incoming air. This action works to deposit water and heavier particles to the bottom of the bowl. A baffle, under the filter element, prevents the deposited water and debris being sucked back into the output air flow. Air is then forced through a filter element, the mesh size determining the minimum size of particle removed from the air flow. So, for example, a 40 micron filter will remove all particles greater than 40 micron in size. 5 micron elements are also available, as are oil and vapour removal filters.
Regulator: The control knob works against a spring which, in turn, places load against a diaphragm assembly. The diaphragm pushes down on a valve pin connected to the valve seat and the seat drops; this allows downstream air flow from the inlet port (P1) out of the outlet port (P2). As air passes down P2, a breathe hole lets air into a chamber below the diaphragm; once pressure either side of the seat is equal, the seat closes with the aid of the spring. Downstream demand will cause a pressure drop in the chamber, opening the seat and allowing air to flow again until pressure is once more equalised and the seat closes. The process is continuous, maintaining P2 at a set value.
Types of filter regulators
The standard Excelon Plus models have ports from G3/8 to G3/4, auto or manual drain and guarded polycarbonate or metal with level indicator bowls. 40 micron filter elements are fitted for all standard options, as is an integrated gauge. Other options are available, for example 5 micron filter elements.
The Olympian Plus standard range has ports G1/4 to G3/4 and auto or manual drain. A metal bowl and 40 micron filter element is fitted to all standard options.