Kromschroder Gas pressure regulator GDJ 25R04-4 03155038

Kromschroder Gas pressure regulator GDJ 25R04-4, SKU 03155038, is a spring-loaded gas pressure regulator with inlet pressure compensation and zero closure. It has a nominal diameter of 25 mm with Rp 1" internal thread, maximum inlet pressure of 400 mbar, and outlet pressure range of 5–160 mbar. The regulator operates within -20°C to +60°C, complies with EN 88 and CE standards, and is suitable for natural gas, LPG, and air. It features a compensation diaphragm, high regulation accuracy, and is designed without a vent line.

When selecting a replacement gas pressure regulator of this type, ensure the connection size and thread type match the existing piping (e.g., Rp 1" internal thread). The required outlet pressure range must align with the spring fitted in the regulator, and the flow capacity should meet the burner's maximum output. Installation typically occurs downstream of the gas filter and upstream of the safety shut-off valve. Verify the regulator's orientation and that the diaphragm and valve seat are intact before fitting.

Common failures include diaphragm wear or valve seat damage, leading to outlet pressure drift or leakage. Symptoms may include unstable burner flame, inability to maintain set pressure, or gas escaping from the regulator. Check for any obstruction in the vent line (if present) and inspect the diaphragm for tears or deformation.