The back flow prevention method consisting of two independent check valves with an automatic operating pressure differential relief valve located between them is called:
a. Air gap back flow prevention
b. Double check valve
c. Reduced pressure principle device
d. Atmosphere vacuum breaker
e. PVB
Answer: C
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Power Engineering Chapter 111
- Which of the following statements about pressure relief valves is false?
- In a circulating hot water system the municipal distribution systems and/or local storage tanks are used for which of the following reasons.
- Which of the following is not an element found in a circulating hot water system?
- Which of the following statements about a constant pressure water system that has a pneumatic tank is false?
- Building codes recommend that nowhere in a building plumbing system should the water pressure fall below:
- When the maximum building demand for water is always less than the maximum flow available from a municipal or local distribution system which of the following systems can be used?
- The building water system that has a storage tank above the highest fixture in the system is called:
- Temperature relief devices are effective in protecting domestic hot water systems from which of the following problems?
- Most municipal water distribution systems operate at pressures between:
- Temperature relief devices limit the temperature in domestic hot water systems to no more than:
- In a domestic circulating hot water system, automatic air vents serve to:
- Building codes generally limit the highest pressure permissible in plumbing systems to:
- Which of the following statements about a pressure relief valve in a building hot water system is false?
- Most building regulations prohibit single pipe systems over ________ in length from a hot water heater or hot water recirculating line.
- Which of the following statements about non-circulating hot water systems is true?