Kromschroder Gas pressure regulator GDJ15R04-4 03155036

The Kromschroder GDJ15R04-4 gas pressure regulator, SKU 03155036, is a spring-loaded reducer with a nominal diameter of 15 mm and Rp 1/2" female connection. It maintains constant outlet pressure within a range of 2–55 mbar, with a maximum inlet pressure of 400 mbar. The regulator features inlet pressure compensation, a compensation diaphragm, and zero shut-off, with a turndown ratio of 10:1. It operates in ambient temperatures from -20 to 60 °C and is suitable for natural gas, LPG, and dry air. This compact unit is designed for minimal maintenance and includes a safety diaphragm without a vent line.

When selecting a replacement gas pressure regulator of this type, verify the connection size and thread (e.g., Rp 1/2" female), the maximum inlet pressure, and the required outlet pressure range. Ensure the regulator's flow capacity matches the burner's maximum output, and confirm the gas type compatibility. Installation typically occurs between the main gas valve and the burner, with orientation (vertical or horizontal) as specified by the manufacturer. Before ordering, compare the existing regulator's dimensions and connection type to the replacement.

Common failures in spring-loaded gas pressure regulators include diaphragm cracks or perforations, leading to drifting outlet pressure. A seized servo mechanism (if present) can cause unstable pressure control. Check the diaphragm for damage, ensure the vent opening is not blocked, and verify the adjustment screw moves freely. If outlet pressure fluctuates or fails to maintain setpoint, inspect these components.