Unit to control gas supply to boiler burner; has first and second isolating valves, valves with two sequential valves operated by common element between first isolating valve and pressure regulator

摘要

The unit has first (5) and second isolating valves, a gas pressure regulator and a gas distributor with two groups of nozzles for a main and an additional gas supply. A valve arrangement with two sequential valves (6,7) operated by a common element (8) is arranged between the first isolating valve and the gas pressure regulator.