neoperl - flow, stop and go

Basin: with a NEOPERL water saver consumption is reduced by up to 50%

Water saving with restrictor

There are two options to control the flow. The most common option is a fixed orifice designed to allow a predetermined flow at a specified pressure (e.g. 60 psi for the US standard). These products are referred to as «restricted» in the NEOPERL literature. By definition, restricted devices provide insufficient flow at low pressure and excess flow at high pressure.

Aerator with pressure compensating flow regulator

With standard aerators the flow rate goes up as the pressure increases. The pressure compensating flow regulator produces – by means of the o-ring – a constant flow rate regardless of pressure fluctuations.

In certain 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
  • plumbing systems where an even distribution of water between various points of use is needed

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-pressurized applications.