Kromschroder Spring 75426270

The Kromschroder Spring 75426270 is an original spare part designed for VGBF series gas pressure regulators, including models VGBF 25 and VGBF 40. It operates within a pressure range of 55–75 mbar and is color-coded blue for identification. Made from premium spring steel, it is suitable for use with natural gas, liquefied gas, and air. This spring is certified to EN 88 standards, ensuring compliance with European safety requirements for gas equipment.

When selecting a replacement spring of this type, verify that the pressure range, spring rate, and physical dimensions (free length, wire diameter, coil count) match the original part. The color marking should be cross-referenced with the manufacturer's data to confirm correct application. During installation, ensure the spring sits correctly in its seat and that the adjustment mechanism is free to move. After installation, the pressure regulator or switch must be re-set and tested with a manometer to confirm the actuation or regulation point falls within the specified range.

Springs of this kind typically fail due to fatigue or corrosion, leading to loss of tension or breakage. Symptoms include unstable outlet pressure, pressure fluctuations, or failure of the regulator to maintain setpoint. In pressure switches, the switch may fail to actuate or may actuate at incorrect pressures, causing burner lockouts or unsafe operation. Check the spring for visible deformation, cracks, or rust, and compare its free length and color code to the original specification.