FUEL GAS FEEDER FOR ENGINE

摘要

PROBLEM TO BE SOLVED: To prevent impairment of normal functions of a fuel gas feeding system provided with a regulator with a lock mechanism forcibly closing a secondary valve by atmospheric pressure inside an intake passage during engine stoppage. SOLUTION: A check valve 31 closing when a pressure of an inlet passage 27 side is higher than a pressure of a negative pressure chamber 20 side is provided in negative pressure piping 22 introducing negative pressure of the intake passage 27 into a negative pressure chamber 20 of the lock mechanism 18 of the regulator 5 for preventing fracture of a lock diaphragm 19 by abnormal positive pressure such as a backfire. During engine stoppage, an opening/ closing valve 33 introduces air into the negative pressure chamber 20 through an air inlet 34 for positively performing the forced valve closing of the secondary valve 12 by the lock mechanism 18 even when the check valve 31 closes early.