Chapter 7 troubleshooting, maintenance and repair

Question 1

The first step when approaching a malfunctioning assembly is to:

Answer 1

Note exactly what is happening

Question 2

Often one symptom can have:

Answer 2

Multiple causes

Question 3

If the first check valve fails, the zone pressure could theoretically increase until

Answer 3

It equals the supply line pressure

Question 4

If the relief valve is_____ the first check valve in the zone zone can never equal the same pressure

Answer 4

Working correctly

Question 5

If the relief I will not open and drip water from the zone or if the needle on the gauge starts to drop but stops before the opening point when testing the RP’s relief opening then:

Answer 5

An outlet shut off valve may be the problem

Question 6

True or false: On an RP, a failing second check valve may show no signs of malfunctioning until testing.

Answer 6

True

Question 7

On an RP when the second check valve is tested to see if it will hold pressure, and it is failing water will most likely

Answer 7

Start to drip from the relief opening

Question 8

If the high-pressure sensing line becomes clogged with supply pressure, trapped on the high side of the diaphragm

Answer 8

The relief valve may stay closed

Question 9

What can become stuck open or closed due to mechanical wear or debris?

Answer 9

A failing relief valve or any of the check valves