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Backflow > PVB , SVB & DC > Flashcards

PVB , SVB & DC Flashcards

1
Q

What is the critical level of a PVB?

A

12 inches above the downstream use

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2
Q

What can be done if the air inlet of a PVB will not seat?

A

Increase the supply pressure

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3
Q

Two areas were a PVB shouldn’t be installed?

A

In a pit or area with toxic fumes

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4
Q

How should a PVB be installed?

A

upright & plumb

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5
Q

A PVB is rated for what type of hazard and backflow?

A

High hazard & low hazard

Backsiphonge only

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6
Q

What is the maximum pressure drop across a PVB?

A

10 PSI

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7
Q

What is the minimum PSID for the check of a PVB?

A

1 PSID

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8
Q

What is the minimum PSID that the air inlet valve of a PVB must open out ?

A

1 PSID

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9
Q

How many test cocks are part of the PVB assembly?

A

Two Test Cocks

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10
Q

Where are the shut off valves located on a PVB assembly?

A

Inlet & Outlet

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11
Q

Can a PVB be subjected to continuous pressure?

A

Yes

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12
Q

The # 1 test cock of a PVB assembly is located where in relationship to the #1 shutoff?

A

Downstream

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13
Q

The hydraulic purpose of any PVB is to stop a__________.

A

Siphon

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14
Q

An indication that a pressure vacuum breaker is undersized for its application is

A

chatter or noise during flow

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15
Q

When using the one hose test on a PVB ,how many of the shut off valves must be closed?

A

Both

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16
Q

Pressure vacuum breaker shut offs and test cocks will avoid freeze damage if winterized by________________

A

rotating the ballvalves handles to a 45 degree angle

17
Q

If not marked , a pressure vacuum breaker’s critical level is

A

the bottom of the valve body

18
Q

What is the most common use for a pressure vacuum breaker?

A

Irrigation system

19
Q

A spill -resistant vacuum breaker’s check valve must be drip tight at ____ PSID.

A

1 PSID

20
Q

The required minimum number of resilient seated valves in an SVB is

A

two

21
Q

The closing & opening pressure of a spill-resistant vacuum breaker’s vent valve is _____PSID

A

1 PSID

22
Q

An SVB ‘s critical level must be above the downstream use by at least _____ inches?

A

12 inches

23
Q

A spill- resistant vacuum breaker assembly has how many test cocks?

A

one test cock

24
Q

The SVB may be subjected to _______ water pressure.

A

continuous

25
Q

The SVB must not be installed in areas containing _____ fumes.

A

toxic

26
Q

How must the SVB be installed according to the manufacturer?

A

Upright & Plumb

27
Q

Which valves of the SVB must be closed when performing the one hose test procedure?

A

Both valves

28
Q

What application was the SVB specifically designed to solve in the plumbing system.

A

X-ray development lab in a Hospital

29
Q

How many test cocks does a Double check detector assembly have as part as the assembly?

A

eight

30
Q

What is the minimum PSID of the #one check on a DC?

A

1 PSID

Backflow (5 decks)

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