Question 100Motor Plants - 1st Asst/Chief

The correct answer is D. The solenoid valve closing allows the water in the opening chamber to bleed off through "S", which allows the sliding piston to move upward due to the force developed in area "J". This is the mechanism that terminates the sludge discharge cycle of the device shown in the illustration. The other options are incorrect because: A) This would describe the opening cycle, not the termination of the sludge discharge cycle. B) The reduction in water pressure to the paring chamber would not directly cause the sliding piston to move upward. C) The weight of the sliding piston alone would not be sufficient to overcome the low water pressure and move it along the axis of the spindle.