MODIFYING A "D" VALVE FOR BALANCED OPERATION

PHOTOS FROM THE ARTICLE:

DIAGRAM OF THE BALANCE ADAPTER CUP, FRONT AND REAR VIEW

THE REVISED ENGINE WITH NEW STEAM CHEST COVER (PHOTO 1)

ORIGINAL UNMODIFIED D VALVE (PHOTO 2)

D VALVE WITH BALANCE CUP MOUNTED (PHOTO 3)

D VALVE O-RING PRESSING ON TEMPORARY LEXAN COVER ( PHOTO 4) SEE MOVIE ALSO

OLD AND NEW STEAM CHEST COVER (PHOTO 5)

OLD D VALVE WITH NEW BALANCE CUP MOUNTING HOLES. LOWER LEFT HOLE PLUGGED (PHOTO 6)

MOUNTED BALANCE CUP SHOWING NARROW O-RING IN PLACE. NOTE FOUR SMALL HIGH PRESSURE COMMUNICATION
HOLES OUTSIDE THIS O-RING (PHOTO 7)

THREE PORT BALL VALVE MOUNTED ABOVE THROTTLE VALVE.  THIS ALLOWS QUICK VENTING
OF RESIDUAL STEAM PRESSURE IN ENGINE PRIOR TO REVERSAL (PHOTO 8)

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