Pneumatic system for controlling a container-filling machine filling valve

In a container-filling machine, a pneumatic pressure system for controlling the operation of means for opening a filling valve, the system comprising first and second and third fluidic control devices each provided with a control chamber and an output chamber connected by an orifice, each control chamber having an outlet to atmosphere and each output chamber having an air pressure outlet, each fluid control device having a pair of opposed inlets aligned with its orifice with one of said inlets opening into the control chamber and the other of said inlets opening into the output chamber, means for continuously delivering air under pressure to both inlets of each control device simultaneously to form air streams that normally meet in the output chamber to produce air pressure therein, a first conduit connecting the pressure outlet of the first control device with the control chamber of the second control device to direct a jet of air against the side of the air stream therein to deflect the stream to the outlet of the control chamber, a second conduit connecting the pressure outlet of the second control device with the control chamber of the first control device to direct a jet of deflecting air against the side of the air stream therein, a third conduit connecting the pressure outlet of the second control device with the control chamber of the third control device to direct a jet of deflecting air against the side of the air stream therein, a fourth conduit connecting the pressure outlet of the third control device with said valve-opening means to open the filling valve when there is sufficient air pressure in said fourth conduit, means for conducting air from said air-delivering means to the control chamber of the first control device to direct a jet of deflecting air against the side of the air stream therein while no container is in filling position, means operated by a container in filling position for stopping the jet of deflecting air from said conducting means, a normally closed valve for connecting said air delivering means with the control chambers of the second and third control devices and adapted to be opened while a container is in filling position to direct a pulse of deflecting air against the side of the air streams in the control chambers of the second and third control devices to shut off the flow of air through said second and third conduits and to direct a jet of air from said first conduit against the side of the air stream in the control chamber of the second control device, whereby only after said valve closes will air pressure be produced in the output chamber of the third control device to operate said filling valve opening means, and means for deflecting the air stream in the control chamber of the first control device as soon as a container is filled.