SPI iris diaphragm

Due to its fluidic characteristics the iris diaphragm SPI is very well suited for adjusting and monitoring the air flow in round air ducts. The iris diaphragm is equipped with two pressure measurement connections through which the flow rate can be determined via a connected differential pressure gauge. The flow rate is proportional to the root of the monitored pressure difference and a resistance factor k. The k-factor depends on the configured free flow area and is readable on the diaphragm.



Product Iris diaphragm Finish The iris diaphragm is made of galvanized steel sheet. The spigot is equipped with a special rubber lip seal. Sizes 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800


Function and effect

The free flow area of the diaphragm and as a result the k-factor can be configured with the lockable adjusting lever. Combined with the differential pressure, the flow rate can be determined with an accuracy of +/- 5%.

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