Dungs Repair kit for pressure regulator FRS DN125 069005

The Dungs Repair kit for pressure regulator FRS DN125 (SKU 069005) is a set of original components designed to restore the functionality of the Dungs FRS 5125 gas pressure regulator. It includes a safety diaphragm with diaphragm disc, control disc with sealing ring and lead screw, spacer sleeves (upper and lower), self-locking nut, and initial pressure compensation diaphragm. The kit is intended for regulators with a nominal diameter of 125 mm and is manufactured in Germany. Its purpose is to maintain a constant outlet pressure in the gas system.

When selecting a repair kit for a gas pressure regulator, match the regulator brand and series, connection size (e.g., flanged DN125), and outlet pressure range. Verify the exact model code, as internal dimensions and spring rates vary by series. Before installation, inspect the regulator body for scoring or corrosion that could compromise new seals. After fitting, recheck outlet pressure and lock-up pressure with a manometer, and verify proper venting.

Typical failures requiring a repair kit include drifting outlet pressure caused by a hardened or perforated diaphragm, a sticking loading spring, or debris preventing the servo regulator from closing properly. These issues manifest as unstable burner operation or inability to maintain set pressure. Check the diaphragm condition, spring movement, and cleanliness of the servo mechanism.