Water Distribution Operator Practice Questions - ABC WPI Water Distribution Operator Certification Exam (Grades 1-4) Exam

Contains a single check valve and a relief valve, while the DCV contains two check valves Has two check valves and a differential pressure relief valve that opens to atmosphere if the pressure zone between the checks drops, providing protection against health hazards Is approved for irrigation systems only, while the DCV is approved for all premises Operates at higher pressures than a DCV and requires no annual testing