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Valves Flashcards

1
Q

Primary function of valves is too

A

Control flow

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2
Q

What valve provides minimal pressure loss or turbulence

A

Gate valve

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3
Q

What valve is not recommended to throttle

A

Gate Valve

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4
Q

What design of gate valve is most common

A

Solid wedge

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5
Q

What gate valve design is less prone to chatter

A

Solid wedge

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6
Q

What gate valve design may stick with varying temp and is not well suited to compensate for distortions

A

Solid wedge

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7
Q

What gate valve design has two separate wedge halves

A

Split wedge

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8
Q

What gate valve design has 2 discs mounted on either side of spreading device

A

Double disc

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9
Q

What gate valve design is the most expensive but can take the most seat misalignment

A

Double disc

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10
Q

Globe valves are _____

A

Directional

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11
Q

Preferred valve when throttling flow

A

Globe Valve

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12
Q

A local water flow alarm is required on sprinkler systems with more then

A

20 sprinklers

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13
Q

The fire department connection size can be

A

Minimum of 2 1/2 but must be at least the size of the largest riser being served

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14
Q

FDC’s are required to be how far above ground

A

18-48”

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15
Q

Larger systems, water must be delivered in how much time to ITV

A

60 seconds

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16
Q

PIV must be installed so the top of the post is _______ above grade

A

32” to 40”

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17
Q

What globe design has max resistance to corrosion

A

Plug disc

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18
Q

Short tapered disc, metal on metal contact

A

Conventional disc

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19
Q

Flat soft disc against the seat in the valve body

A

Composition disc

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20
Q

Sharp point that controls flow through seat, excellent for throttling

A

Needle valve

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21
Q

What globe design is most common in sprinklers

A

composition disc

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22
Q

Best suited where a 90 bend is required

A

Angle valve

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23
Q

Thread design easiest to tell if open or closed

A

Rising stem with outside screw

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24
Q

Common stem design for angle and globe valves

A

Rising stem with inside screw

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25
Q

Stem design typically found in gate valves, doesn’t move up or down

A

Non rising stem with inside screw

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26
Q

Bonnet joint not good for frequent service/light duty

A

Screwed bonnet

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27
Q

Best bonnet for service, more strength then screwed

A

Union bonnet

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28
Q

Bonnet that consists of flanged connection with nuts bolts and gaskets

A

Bolted Bonnet

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29
Q

This bonnet has a “U” that wraps around the body holding it in position

A

Clamp bonnet

30
Q

Nuts hold gland and packing in place

A

Packing nut with gland

31
Q

Gland and packing held in place with bolts

A

Bolted gland

32
Q

Gland and packing held in place with swing type bolts for easy service

A

Lantern type gland

33
Q

Which valve allows full flow or no flow in both directions with minimal pressure drop

A

Butterfly valve

34
Q

Pressure reducing valve max set pressure on sprinkler system

35
Q

Pressure relief valve pressure set

A

175, or 10 psi above system pressure

36
Q

Electrically supervised valves need to be inspected

37
Q

Valves are to be tested

A

Annually through its full range

38
Q

Maintenance on os&y valves is done by

A

Lubricating valve, open and close to distribute lube,

39
Q

Supervisory switches are tested

A

Semi-annually

40
Q

Signal must be received from supervisory within

A

2 revolutions of operating wheel, or when stem was turned 1/5 from normal position

41
Q

External leaking points on os & y

A

Packing, bonnet, flanges

42
Q

Gauges must be installed on

A

Inlet and outlet

43
Q

Pressure reducing valves inspected to verify open position, not leaking, maintaining downstream pressure, hand wheels are un broken

44
Q

Master pressure reducing valves supply & discharge should be inspected

45
Q

A full flow test is conducted every ____ years, a partial flow test is conducted _____

A

5 years, annually

46
Q

Main drain test must be done

A

Annually, or whenever valve is closed

47
Q

Five principle valves in sprinklers

A

Gate, globe, butterfly, ball, check

48
Q

Three different stem designs are

A

Rising stem with outside screw
Rising stem with inside screw
Non-rising stem with inside screw

49
Q

3 different stuffing boxes are

A

Packing but with gland
Bolted
Lantern

50
Q

4 types of bonnet designs are

A

Screwed
Union
Bolted
Clamp

51
Q

3 disc designs for gate valves

A

Solid, Split, Double disc

52
Q

4 types of disc design for globe valves

A

Plug disc
Conventional disc
Composition disc
Needle valve

53
Q

Up to 2” riser or main size, what is the required drain size

A

3/4” or larger

54
Q

2 1/2 to 3 1/2 riser or main size, what is the required drain size

A

1 1/4 or larger

55
Q

4” or larger riser or main size, what size drain is required

A

2” or larger

56
Q

Where a section of piping is more than ____ gallons a 1” valve piped to an accessible location is required

57
Q

S.S

A

Stainless steel

58
Q

F.M

A

Factory mutual approved

59
Q

U.A

A

Underwriters approved

60
Q

I.B.B.M

A

Iron Body Bronze Mounted

61
Q

S.W.

A

Solid wedge

62
Q

D.D

A

Double disc

63
Q

R.S

A

Rising spindle

64
Q

N.R.S

A

Non rising spindle

65
Q

W.S.P

A

Working stem pressure

66
Q

W.O.G.

A

Non-Shock cold water oil gas

67
Q

O.S & Y

A

Outside stem and yoke

68
Q

P.I.V

A

Post indicator valve

69
Q

E.P.D.M

A

Ethylene Propylene dien monomer

70
Q

U.L.C

A

Underwriters laboratories Canada

71
Q

c.U.L

A

Canadian underwriters laboratories

Bas. (8 decks)

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