NCCCO Concrete Pump (CPO) Practice Questions - NCCCO CCO Concrete Pump Operator (CPO) Exam

On a typical double-piston concrete pump, what is the primary purpose of the S-valve (rock valve)?

Filters aggregate larger than the line ID Switches the discharge path between the two material cylinders so flow stays directed into the delivery line Increases concrete slump just before discharge Vents trapped air from the hopper

Correct Answer:

Switches the discharge path between the two material cylinders so flow stays directed into the delivery line

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