flows downstream of the control orifice through an internal bore 26 and a throttle 27 located in the bearing shaft to injection positions which are disposed in the vicinity of the periphery of the baffle plate 3 where the velocity of the air flow is expected to be highest the injection may take place via individual fuel openings 28 which communicate with the bearing shaft of the baffle plate 3 and which share in its rotation so that the metered out fuel is highly atomized and intimately mixed with the aspirated air alternatively the metered out fuel may be prepared by supplying air through an air line 29 an annular groove 30 in the bearing 8 an annular groove 31 in the shaft 7 and openings 32 the pressure of the fuel in the line 19 may be set and adjusted by a pressure control valve 34 the pressure control valve 34 includes a diaphragm 37 which defines a first chamber 36 and a second chamber 38 the first chamber 36 is connected by a line 35 to the annular groove 20 and the second chamber 38 contains a compression spring 39 whose effective force may be changed in dependence on operational variables of the engine this may be done for example by an electromagnet not shown which engages the spring 39 via an actuating pin 40 alternatively an additional force which depends on operational engine variables may act directly on the diaphragm 37 in parallel with the spring 39 the pressure control valve 34 is embodied as a flat seat valve whose movable valve member is the diaphragm 37 which cooperates with a fixed valve seat 41 over which fuel may return to the fuel.