Device to control gas supply and gaseous fuel injector

An inlet (2) delivered gas to an upper chamber (13), in the valve body (1), that communicates also (8) with a lower chamber (7). The passage of gas from the latter into the interior projection (9) of the outlet orifice (30) is prevented, when the valve is closed, by an obstructing circular ferromagnetic valve plate (12), held fast to its seat (11) mainly by the pressure difference between the inlet and outlet passages. Though constrained radially by the wall of the lower chamber plate is capable of limited displacement axially between the closed position already described, on the valve seat, and an open position in which its upper surface is maintained against an annular resilient buffer (14) on the solenoid's under surface by the attractive force of the solenoid (4) mounted in the upper chamber. When the latter is de-energized, the valve is immediately reclosed by the pressure differential. Several variants are described.