Ball check valve with particular cage means

Claim 1

IN A BALL CHECK VALVE, THE COMBINATION COMPRISING: A BALL CHAMBER DEFINING A BORE HAVING AN OUTWARDLY OPENING PASSAGE AT ONE END, THE INNER LIP OF WHICH PASSAGE DEFINES A GENERALLY CIRCULAR SEAT, AND A LINE PASSAGE PORT OPENING LATERALLY OFF ONE SIDE; A BALL OF A DIAMETER SUBSTANTIALLY SMALLER THAN THE BORE WHICH IS SEALINGLY ENGAGEABLE WITH THE SEAT AND IS MOVABLE WITHIN THE BORE BETWEEN THE SEAT AND A POSITION SUBSTANTIALLY PAST THE PORT; AND A GUIDE MEMBER IN THE BORE AT THE LEVEL OF THE PORT TO DEFINE A BORE PORTION OF REDUCED DIAMETER THROUGH WHICH THE BALL PASSES AS IT MOVES PAST THE PORT, SAID GUIDE MEMBER BEING CUT AWAY OVER THE ENTIRE AREA OF THE PORT AN HAVING A PAIR OF EDGES DEFINING ITS CUTOUT PORTION WHICH ARE GENERALLY PARALLEL TO THE AXIS OF THE SEAT AND ARE DISPOSED ON OPPOSITE SIDES OF THE PORT, WHICH EDGES ARE FLEXED INWARDLY FROM THE WALLS OF THE BORE SO THAT THE BORE PORTION FORMED BY THE GUIDE MEMBER HAS ITS AXIS OFFSET, WITH RESPECT TO THE AXIS OF THE SEAT, IN A DIRECTION SUBSTANTIALLY DIRECTLY AWAY FROM THE PORT.