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Pressure Compensating
Pressure Compensating
Working Principle of Pressure Compensating Aerators

Pressure Compensating Aerators (PCA®)

There are two options to control the flow. The more common option is a fixed orifice designed to allow a predetermined flow at a specified pressure (e.g. 60 psi for the US standard) – such products are referred to as «restricted» in the Neoperl literature.

The other option is to compensate for variations in pressure to achieve a near-constant flow rate with Neoperl's Pressure Compensating Aerator (PCA®) technology. The pressure compensating flow regulator produces – by means of its o-ring – a flow rate that is near-constant, regardless of pressure fluctuations.

Restricted devices tend to provide insufficient flow at low pressure and excess flow at high pressure. In many markets and applications it is preferable to select the NEOPERL® PCA® technology. The fields of application include: markets with a standard defining the maximum flow rate, water conservation, and plumbing systems where an even distribution of water between various points of use is needed.

Suitable system pressure range for PCA® aerators: 1-8 bar


Working Principle of Pressure Compensating Aerators

Static conditions (no flow):
The o-ring is relaxed (position 1).

Dynamic conditions (flow):
The o-ring subjected to the line pressure is compressed into the seating area which reduces the water passage (position 2). As the pressure increases the o-ring is compressed further into the seating area and reduces the water passage further (position 3). As the pressure decreases the o-ring relaxes and reopens the water passage (return to position 2 and 1). Pressure compensating flow regulators are not recommended for use in non-pressurised applications.