Kromschroeder 74924629 VGBF100..40 /B membrane

Compensating membrane Kromschroder 74924629 for regulator VGBF 100..40 /B is an original spare part designed to restore the tightness and accuracy of the gas pressure regulator. The membrane compensates for fluctuations in inlet pressure. It senses changes in inlet pressure and counteracts them, ensuring stable outlet pressure regardless of line fluctuations. Installing a new membrane eliminates combustion instability caused by elastomer fatigue or damage. Key features: Part numbers: 74924629, 624.478.004; Manufacturer: Kromschroder / Honeywell (Germany); Part type: Compensating diaphragm; Compatibility: VGBF 100..40 /B (gas pressure regulator DN100, outlet pressure range up to 4 bar); Material: Perbunan (NBR) — oil and gas resistant rubber, resistant to natural and liquefied gas; Operating temperature range: -15°C to +60°C; Weight: 0.020–0.026 kg; EAN code: 4031624746292. Application and signs of wear: This membrane is used in VGBF 100..40 gas pressure regulators (with outlet pressure range up to 4 bar). These regulators are installed on gas trains (ramps) before the burner in industrial boiler houses, furnaces, and heat generators. Signs of malfunction or wear: Unstable outlet pressure: pressure floating or pulsating after the regulator despite spring adjustments. External gas leaks: gas escaping through the vent line (breather valve) or regulator housing. Sticking of the regulating mechanism: valve stem moves jerkily or jams. Pressure mismatch: regulator cannot raise pressure to set value (droop) or pressure is constantly above setpoint.