Filling element for counter pressure filling machines

Claim 1

A filling structure for counter-pressure filling machines with relief valve means which includes: housing means comprising liquid inlet means for receiving liquid to be filled into a vessel and also comprising liquid discharge means with a discharge bore adapted to communicate with said liquid inlet means for discharging liquid into the vessel to be filled, means located at the outer end of said discharge bore and surrounding said liquid discharge means and being adapted to receive pressed thereagainst the mouth of a vessel to be filled with liquid admitted through said inlet means, the interior of said housing means comprises a valve seat at the inner end of said discharge bore, a first valve body reciprocably guided in said housing means and having a bore therethrough extending in the direction of reciprocation of said valve body for conveying tension gas therethrough, said valve body having a portion at one end of said last mentioned bore operable to sealingly engage said valve seat and to disengage said valve seat to control the communication between said liquid inLet means and said discharge bore, valve seat means at the other end of said bore through said first valve body, gas inlet means for conveying tension gas into said last mentioned bore, a second valve body movable into and out of sealing engagement with said valve seat means for controlling the communication between said gas inlet means and the bore through said first valve body, spring means arranged within said housing means and continuously urging said first valve body to disengage said valve seat for establishing communication between said liquid inlet means and said liquid discharge means, fluid operable means associated with said second valve body and operable to move said second valve body into sealing engagement with said valve seat means for interrupting communication of said gas inlet means with said bore through said first valve body, said fluid operable means also being operable to move said second valve body against the thrust of said spring means into sealing engagement with said valve seat to interrupt fluid communication between said liquid inlet means and said liquid discharge means, gas conduit means having one end thereof connected to said first valve body while having its interior in communication with the bore which extends through said first valve body, said gas conduit means having its other end protruding from said liquid discharge means to extend into the vessel to be filled, control means extending protected into the bore which extends through said second valve body, and electric means electrically connected to said control means for controlling said first and second valve bodies after achieving filling height.