medium fluid float 12 is in its highest position valve lever 36 extends perpendicularly the prebiased compression spring 70 presses valve plate 38 directly against outlet opening 22 of nozzle 56 conical point 64 consequently closes off this opening when the liquid level drops as shown in the drawing with broken line 76 as a result of rising air volume in housing 10 float 12 is moved downward thus the spherical end 40 of valve lever 36 is thrust to the side or laterally by guide 42 up into inclined bore 44 valve plate 38 tips or pivots around first pivot point 60 at the point of its conical apex 64 until valve plate border 66 engages on the bottom of nozzle 56 to form the second pivot point 62 the resulting setting is shown in fig2 and 2a in this position the grummet sealing ferrule or stuffing cone 64 is already completely raised from its seat and then enclosed air can dissipate into the atmosphere float 12 is then raised again by the rising liquid level 76 and nozzle opening 22 is closed before liquid can be discharged if liquid level 76 drops still further as a result of a greater volume of air then valve lever 36 tips in the manner described above until it reaches the second pivot point 62 and then moves further around this second pivot point the conical point is pivoted even further out of outlet opening 22 the.