Kromschroder Compensating membrane (diaphragm) 74924621

The Kromschroder compensating membrane (diaphragm) 74924621 is an original spare part for gas pressure and ratio regulators. It is designed for use with Kromschroder VGBF 80..05/10 and GIK 80 /B regulators. This diaphragm senses changes in inlet pressure and counteracts them, ensuring stable outlet pressure despite line fluctuations. It is made of perbunan (NBR) rubber, resistant to natural gas and liquefied gas (propane-butane). The nominal diameter is 80 mm, and the maximum inlet pressure is 1000 mbar. It is manufactured in Germany.

When selecting a replacement diaphragm of this type, verify the regulator model and nominal diameter to ensure compatibility. The diaphragm must match the specific regulator series and size, as well as the gas type and pressure rating. Installation involves disassembling the regulator, removing the old diaphragm, and fitting the new one, ensuring proper sealing and alignment. Always check the regulator's condition and replace any worn gaskets or seals during the process.

Signs of a worn or damaged diaphragm include unstable outlet pressure, such as floating or pulsating readings despite spring adjustments. Gas/air ratio drift may occur, leading to difficulty in setting normal combustion with fluctuating O2/CO2 levels. External gas leaks through the vent line or regulator housing can also indicate diaphragm failure. Regular inspection of the diaphragm for cracks, hardening, or deformation is recommended.