Backflow Certification Evaluation Questions And Solutions Graded A+

BACKFLOW CERTIFICATION EVALUATION
QUESTIONS AND SOLUTIONS GRADED A+

●● What are the components of a RP ?
Answer: Two independently operating check valves , a relief valve
assembly , four test cocks and two shut - off valves .


●● What are the components of a DCVA ?
Answer: Two independently operating check valves , four test cocks and
two shut - off valves .


●● What is the definition of backsiphonage ?
Answer: Backflow caused by a drop in supply pressure below
atmospheric pressure .


●● The RV drips after closing customer's shut - off valve . Why ?
Answer: CV # 1 leaks


●● What causes the RV to spit ?
Answer: Line pressure fluctuation .


●● If there is backpressure on the RP what does the RV do ?

, Answer: Nothing unless CV # 2 leaks .


●● If there is a drop in supply pressure what does the RV do ?
Answer: Opens to dump the zone .


●● What holds the Relief valve open ?
Answer: Relief valve spring .


●● What holds the Relief valve closed ?
Answer: Supply pressure .


●● Relief valve does what if outlet shut - off valve leaks ?
Answer: Relief valve tries but may not open when being tested .


●● In test # 3 on the RP , open vent control and the gauge needle rises ,
what's wrong ?
Answer: The outlet shut - off valve leaks with backpressure .


●● How do you know if the outlet shut - off valve leaks ?
Answer: 1. The RV may not open while testing
2. The meter is running .
3. You can hear the water running .