Kromschroder Compensating diaphragm 74924622

This is a compensating diaphragm for Kromschroder VGBF 100..05/10 gas pressure regulators and GIK 100 /B gas-air ratio regulators. It is made of perbunan (NBR) and weighs 255 g. The diaphragm senses changes in inlet pressure and counteracts them, ensuring stable outlet pressure. It maintains a 1:1 gas-air ratio in GIK regulators. Replacing a worn diaphragm restores tightness and eliminates gas leakage.

Parts of this type are selected by the valve series they fit, as the diaphragm shape, hole pattern, and thickness must match the original. Before ordering, verify the series and model of the regulator. When installing, ensure the diaphragm is seated squarely and retaining screws are torqued to specification. Inspect the valve seat for debris or corrosion, and confirm the spring is not fatigued.

When diaphragms of this kind fail, they can cause gas leakage through the vent line or regulator housing. The equipment may exhibit unstable outlet pressure or an incorrect gas-air ratio, leading to burner instability or flame blow-off. Check the diaphragm for cracks, tears, or loss of elasticity.