IrrigationCâu 7 / 100
An atmospheric vacuum breaker (AVB) has which key installation limitation?
a.It must never be under continuous pressure and cannot have valves downstream
b.It can protect against backpressure
c.It may be installed below the sprinkler heads
d.It requires two check valves
Giải thích
An atmospheric vacuum breaker protects only against backsiphonage and must be installed downstream of the last control valve with no shutoff valves after it. It cannot be under continuous pressure for more than about 12 hours and must sit above downstream outlets. It is the simplest and least expensive backflow device.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Under California's Model Water Efficient Landscape Ordinance (MWELO), overhead spray irrigation is generally prohibited in landscape areas narrower than what width?
- A reduced pressure principle (RP) backflow assembly is primarily used to protect a potable water supply against what?
- A pressure vacuum breaker (PVB) must be installed at what minimum height relative to the highest downstream sprinkler head or outlet?
- Water hammer in an irrigation system is BEST reduced by which measure?
- Which pipe material is MOST commonly used for buried irrigation mainlines under constant pressure in California?
- As irrigation pipe diameter decreases while flow stays the same, what happens to friction (pressure) loss?
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