268.20 EURexcl. VAT · import VAT and duties on delivery
Key specifications
| Weight | 24 g |
|---|---|
| Material | perbunan (NBR) |
| Gas type | natural gas, liquefied gas (propane-butane) |
| Compatibility series | VGBF 80..40 /B |
| Outlet pressure max | 4000 mbar |
| Original part | original spare part |
286.20EUR
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Description
The Kromschroder Compensating diaphragm 74924628 is an original spare part for the VGBF 80..40 /B gas pressure regulator. It is made of perbunan (NBR) rubber, which is resistant to natural gas and liquefied gas (propane-butane). This diaphragm senses changes in inlet pressure and counteracts them to maintain stable outlet pressure, with a maximum outlet pressure of 4000 mbar. It weighs 24 g and is designed to restore tightness and accuracy in the regulator.
Further details
| Function | restore tightness and accuracy of gas pressure regulator; senses changes in inlet pressure and counteracts them, ensuring stable outlet pressure |
|---|---|
| Replacement benefit | eliminates combustion instability caused by elastomer fatigue or damage |
| Signs of wear | unstable outlet pressure, external gas leaks, sticking of regulating mechanism, pressure mismatch |
Choosing and fitting
Parts of this type are selected by matching the part number to the specific regulator series, such as the VGBF range. Before installation, inspect the valve seat and ensure the internal spring and guiding surfaces are clean and undamaged. The diaphragm's thickness, hardness, and shape must correspond to the original to maintain proper response and sealing.
Signs of failure
When this kind of diaphragm wears or fails, symptoms include unstable outlet pressure (floating or pulsating), external gas leaks through the vent line or housing, sticking of the regulating mechanism, and pressure mismatch (either droop or constant overpressure). These issues can lead to combustion instability.
All specifications
| Weight | 24 g |
|---|---|
| Material | perbunan (NBR) |
| Gas type | natural gas, liquefied gas (propane-butane) |
| Compatibility series | VGBF 80..40 /B |
| Outlet pressure max | 4000 mbar |
| Original part | original spare part |
Part numbers
| SKU | 74924628 |
|---|---|
| Additional article | 624.478.010 |
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