Maximum liquid level control valve

Claim 2

A valve for limiting the flow of liquid into a tank comprising: a valve body mountable horizontally to a side wall of said tank at an elevation corresponding to a maximum liquid level and having a passage for liquid to flow through into said tank; a float pivotally hinged to said body; a flap valve movably to said body and operable under incoming liquid pressure to close said passage, said flap valve and said body being positioned entirely within said tank and not extending therefrom; a cam device movable by said float and operative to open and close said flap valve; and wherein: said cam device consists of a first cam element with a recess allowing said flap valve to close and a second cam element with a cam surface for opening said flap valve, said first cam element and said second cam element are pivotally hinged to said valve body, said second cam element has a control pin cantileveredly mounted thereto projecting through said first cam element; said second cam element and said float are interconnected to pivot together at all times; said first cam element is movable with respect to said second cam element; and further comprising a mounting rod mounted to said body and fixedly connected to said second element, said rod projects through said first element.

Claim 3

The valve of claim 1 additionally comprising: a movable stem extending longitudinally through said body with a first end and a second end, said first end engages said flap valve, said second end has a roller thereon abuttingly engaging said cam device and wherein said control pin contacts said first element causing rotation thereof at maximum liquid level allowing said roller to roll off said cam surface and snap into said first cam element recess; a guide on said body receiving said second end retaining said roller against said cam device; a counterweight connected to said float for balancing said float in said liquid; and wherein: said valve body has a flanged end mountable to said tank by fasteners.

Claim 4

A valve for limiting the flow of liquid into a tank comprising: a valve body mountable horizontally to a side wall of said tank at an elevation corresponding to a maximum liquid level and having a passage with a valve seat for liquid to flow through into said tank; a float pivotally hinged to said body; a stem extending through said body and being movable by the action of said float and having a longitudinal axis; a disc fixedly mounted to an end of said stem adjacent said valve seat being biased toward said valve seat to close said passage by incoming fluid pressure; an elongated member pivotally mounted to said body at a location above said axis and having an outer end and an inner end; a link having a first end pivotally connected to said inner end of said elongated member and having a second end pivotally connected to said stem at a location on said axis; a stop fixedly mounted on said body about said axis limiting upward movement of said elongated member and said link; a bracket mounted on said float having a slot through which said outer end of said elongated member projects, said slot having a top end which abuts said outer end of said elongated member as said float pivots downwardly forcing said inner end of said elongated member and said link above said axis and against said stop holding said disc away from said valve seat, said slot haS a bottom end which abuts said outer end of said elogated member as said float pivots upwardly forcing said inner end of said elongated member and said link below said axis allowing said disc to seat on said valve seat, said slot is of sufficient length to allow said outer end of said elongated member to quickly move from said bottom end to said top end when said float pivots upwardly and said inner end of said elongated member passes from atop said axis to below said axis.

Claim 5

A valve for limiting the flow of liquid into a tank comprising: a valve body mountable horizontally to a side wall of said tank at an elevation corresponding to a maximum liquid level and having a passage with a valve seat for liquid to flow through into said tank; a float pivotally hinged to said body; a stem extending through said body and being movable by the action of said float and having a longitudinal axis; a disc fixedly mounted to an end of said stem adjacent said valve seat being biased toward said valve seat to close said passage by incoming fluid pressure; an elongated member pivotally mounted to said body at a location above said axis and having an outer end and an inner end; a link having a first end pivotally connected to said inner end of said elongated member and having a second end pivotally connected to said stem at a location on said axis; a stop fixedly mounted on said body about said axis limiting upward movement of said elongated member and said link; a bracket mounted on said float having a slot through which said outer end of said elongated member projects, said slot having a top end which abuts said outer end of said elongated member as said float pivots downwardly forcing said inner end of said elongated member and said link above said axis and against said stop holding said disc away from said valve seat, said slot haS a bottom end which abuts said outer end of said elogated member as said float pivots upwardly forcing said inner end of said elongated member and said link below said axis allowing said disc to seat on said valve seat, said slot is of sufficient length to allow said outer end of said elongated member to quickly move from said bottom end to said top end when said float pivots upwardly and said inner end of said elongated member passes from atop said axis to below said axis.

Claim 6

The valve of claim 3 and wherein: said stem is of sufficient length to position said wall away from said valve seat when said link is in said first position.

Claim 7

The valve of claim 4 wherein: said tank has a side wall with a hollow bushing mounted to and extending therethrough; said valve body extends horizontally through said bushing into said tank and has a flanged end secured outwardly against said bushing; and, said body is internally threaded to receive an input liquid line.