belt 54 so as to provide improved tensioning force to keep the drive belt 54 in tension a guard cover 58 is placed around the drive belt 54 and the rotatable members 50 and 52 while the most preferred drive is a belt drive system it should be appreciated that other drive systems and or linkages may also be provided for the valve actuator 28 for example a chain and sprocket type drive system might be used the motor 48 is largely positioned in the space 60 this presents an extremely compact assembly however by doing this one still needs to translate the motion provided by the motor to movement of the flush valve this is achieved by the use of the belt drive which essentially parallels the front to back axis of the toilet albeit on a lateral side of the trap referring next to fig7 and 8 the operation of the flush valve 26 is illustrated in these figures the flush valve 26 is illustrated in phantom lines in fig7 the flush valve 26 is positioned in an operational seal position in which the arcuate sealing surface 44 of the flush valve 26 contacts the lip of the valve seat 46 to.