What terminates the sludge discharge cycle of the device shown in the illustration? Illustration MO-0112

Correct Answer: Option D — The solenoid valve closes, allows the water in the opening chamber to bleed off through "S", and the sliding piston moves upward due to the force developed in area "J".

Closing the solenoid valve stops the supply of operating water to the opening chamber, allowing water to bleed off through orifice 'S'. Continuous closing water pressure in area 'J' then forces the sliding piston upward, sealing the bowl for operation.