58 the 90 u00b0 rotation will move the relief area 59 over the opening 54 in the stationary valve member 31 also relief area 60 is aligned with inlet 55 the valve is thus in the full open position note that during this particular movement the valve was moved in a clockwise manner to effect the opening to close the valve a counterclockwise motion would be imparted as indicated by the direction arrow in fig1 b thereby bringing the valve back to the position shown in fig1 a note that in fig1 c the projection 28 is now placed in the slot 35 rather than the slot 34 in this initial position the valve is closed as indicated by the relief portion 59 being out of orientation with either of the openings 54 or 55 to open the valve a counterclockwise motion must be imparted to the valve stem 19 as indicated by the direction arrow in fig1 c this means that the relief area 59 will also be moved in a counterclockwise motion to be oriented over the opening 55 while the relief area 60 is brought into communication with the opening 54 accordingly the end portion 28b of the projection 28 will be moved to a position indicated in broken lines in fig1 d and the end portion 28a will be moved to that shown also in fig1 d thus a counterclockwise motion opens the valve while a clockwise motion closes it as indicated by the directional arrow in fig1 d it will therefore be appreciated that a right hand left hand conversion is easily achieved merely by initially aligning the bar 28 in either groove 34 or groove 35 it will also be appreciated that flange 29 assists.