51131116054 Gas Pressure Regulator

Genuine MAN gas pressure regulator for CNG (Compressed Natural Gas) or LNG (Liquefied Natural Gas) powered MAN bus and truck engines in the D08 gas engine family. Mounted in the gaseous fuel supply circuit downstream of the high-pressure tank or LNG vaporiser, this regulator reduces supply pressure to the stable low-pressure level required for metered injection into the combustion chambers. Precise and consistent pressure delivery is critical for maintaining stoichiometric combustion and meeting emissions targets — pressure drift causes rich or lean operation, increased methane slip, and catalyst damage. The regulator must be replaced — not repaired — if it exhibits pressure drift outside the calibrated tolerance, external gas leakage, or failure to hold downstream setpoint pressure. This is a safety-critical component: all work on CNG and LNG fuel systems must be carried out by technicians trained and certified in gaseous fuel system service, using calibrated pressure test equipment. Isolate the gas supply completely and purge the circuit before removing the regulator.