Kromschroder Gas pressure regulator GDJ25R04-0Z 03155068

The Kromschroder GDJ25R04-0Z is a spring-loaded gas pressure regulator with inlet pressure compensation, designed to maintain a constant outlet pressure. It features a built-in safety diaphragm and zero closure, and requires no vent line. Suitable for natural gas, liquefied gas, and air, it has a nominal diameter of 25 mm (Rp 1" connection), a maximum inlet pressure of 400 mbar, and an outlet pressure range of 5–160 mbar (standard setting 12.5–25 mbar). Operating temperature range is -20°C to +60°C, weight is 1000 g, and it complies with EN 88, EN 334, and CE standards.

When selecting a gas pressure regulator of this type, ensure the nominal diameter and connection thread match the existing pipework (e.g., Rp 1"). Verify the maximum inlet pressure and required outlet pressure range are within the regulator's specifications. Check the gas type compatibility (natural gas, liquefied gas, air) and temperature range. Installation must follow the flow direction arrow on the body, and the vent port (if present) must not be blocked. For regulators without a vent line, ensure the built-in safety diaphragm is intact.

Common failures include diaphragm fatigue, dirt in the pilot valve, or corrosion, leading to drifting outlet pressure or leakage. Symptoms may include unstable burner operation, fluctuating gas pressure, or failure to maintain set point. Check the regulator for proper lock-up pressure after servicing, and inspect the diaphragm and valve seat for wear or contamination.