Kromschroder Working diaphragm 74924630

This is a working diaphragm for Kromschroder VGBF, VAR, and GIK gas regulators in the 65/B size. It converts pneumatic pressure differential into mechanical force to move the valve, helping maintain stable outlet pressure and precise set points. The diaphragm is made of perbunan (NBR) rubber, which is compatible with natural gas and liquefied gas (propane-butane). Replacing a worn diaphragm restores regulation accuracy and tight shut-off.

For regulators of this kind, the replacement diaphragm must match the exact valve series and model, as the part number is specific to the valve types. Before installation, confirm that the diaphragm material is compatible with the gas type used, and inspect the sealing surfaces for cleanliness. The diaphragm is usually replaced as a subassembly and is not adjusted in the field; follow the manufacturer's torque and orientation instructions to avoid premature failure.

Diaphragms in these regulators can wear or age, especially after long exposure to high ambient temperature. Signs of a failing diaphragm include erratic outlet pressure, slow or delayed valve opening, incomplete shut-off, internal leakage, and unstable combustion. When these symptoms appear, check the diaphragm for tears, hardening, or loss of elasticity before considering other components.