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...my Stuff > Valves, Pipe Fittings and Piping > Flashcards

Valves, Pipe Fittings and Piping Flashcards

1
Q

what is the function of a check valve?

A

to permit the flow of the fluid in one direction only

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2
Q

a gate valve is an example of what class of valves?

A

stop valves

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3
Q

what is the most common stop valve?

A

globe valve

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4
Q

what is the purpose of a bridge wall marking on a glove valve?

A

indicate the direction of flow

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5
Q

what type of valve is always open or always closed, and does not regulate fluid flow?

A

gate valve

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6
Q

what is meant by the term rising stem gate valve?

A

both the gate and the stem move upward when the valve is opened

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7
Q

what prevents gate valves used in high pressure steam systems from binding?

A

flexible gates

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8
Q

what are the disks and seats of valves used in high temperature steam systems surfaced with?

A

satellite

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9
Q

what type of valve is shaped to hold a cylindrical or tapered plug?

A

plug valve

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10
Q

what are plug valves commonly used for?

A

petcocks on auxiliary machinery

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11
Q

what type of valve is a combination gate valve and plug valve?

A

piston valve

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12
Q

what determines the tightness of a piston valve?

A

the closeness of fit between the piston and the inside of the cylinder

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13
Q

what type of valve is used to make relatively fine adjustments?

A

needle valve

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14
Q

what is the needle valve installed on an auxiliary turbine used for?

A

as an overload nozzle

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15
Q

what type of valve is light in weight, takes up less space than a gate or globe valve, and is relatively quick acting?

A

butterfly valve

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16
Q

how far must a butterfly valve be rotated to pen or close the valve?

A

1/4 turn or 90 degrees

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17
Q

what type of seat does a butterfly valve have?

A

resilient

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18
Q

what type of check valve, does the disk move up and down in response to changes in the pressure of incoming fluid?

A

lift check

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19
Q

what type of check valve, does the disc move in an arc to open or close the valve?

A

swing check

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20
Q

on a stop check valve, the maximum lift of the disk is controlled by?

A

the position of the valve stem

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21
Q

what type of valve opens automatically when the pressure in the line or in the unit becomes too high?

A

relief valve

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22
Q

what prevents a relief valve from lifting at normal operating pressure?

A

spring tension

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23
Q

how are relief valves set?

A

by the adjusting screw or adjusting nuts

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24
Q

at what pressure does the combination exhaust relief valve lift?

A

2 psi above auxiliary exhaust line pressure

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25
Q

what type of valve, gives an audible warning to the operator, when it lifts?

A

sentinel valve

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26
Q

what are two opposing forces on a spring loaded reducing valve?

A

the downward force of the spring; the upward force of steam pressure

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27
Q

on a spring loaded reducing valve, what determines the position of the auxiliary valve?

A

position of the controlling diaphragm

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28
Q

automatic unloading valves are installed to exhaust to what major components?

A

main and auxiliary condensers

29
Q

what is the function of an unloading valve?

A

to discharge steam from the auxiliary exhaust line to the condenser whenever the auxiliary exhaust exceeds 15 psi

30
Q

what comments is used when it is necessary to take suction from one of several sources and discharge to another unit or several units of the same or a separate group?

A

valve manifold

31
Q

what allows an operator certain valves from distant locations?

A

remote operating gear

32
Q

what is the cooling source for the inline desuperheater?

A

feedwater

33
Q

what device is installed in steam lines to drain condensate from the lines without allowing steam to escape?

A

steam trap

34
Q

what type of steam traps are considered to be mechanical type?

A

ball float and bucket type

35
Q

how is the operation of a bellows type steam trap controlled?

A

by the expansion of the vapor of volatile liquid is enclosed in the bellows

36
Q

what type of steam trap operates under the principle that hot water under pressure flashes into steam when the pressure is reduced?

A

impulse

37
Q

what is the only moving part in an impulse steam trap?

A

the disk

38
Q

constant flow drain orifices are used in what systems?

A

150 psi or above where condensate load and pressure remain neat constants

39
Q

what type of steam trap relies on variable density of condenser?

A

orifice

40
Q

what type of steam trap uses dissimilar metals to operate?

A

bimetallic

41
Q

where can installations and other information be found pertaining to flange shields?

A

NSTM 505

42
Q

what are two types of piping expansion joints used onboard ship?

A

sliding and flexible type

43
Q

what type of piping expansion joint absorbs motion by the movement of a bellows or some similar device?

A

flexible type

44
Q

what does a valve that has a marking on the body 2000 WOG indicate?

A

valve is suitable for water, oil and gas service at 2000 psi

45
Q

how is tubing identified in the Navy?

A

by outside diameter (OD) and by actual measured wall thickness

46
Q

what is the composition of copper nickel alloy tubing used onboard surface ships?

A

90 percent copper and 10 percent nickel

47
Q

what are two classes of packing and gasket joints?

A

moving and fixed

48
Q

what type of joint uses gasket material?

A

fixed

49
Q

what type of joint uses packing material?

A

moving

50
Q

a fixed joint is identified by the first digit in the symbol number, which would be?

A

two

51
Q

a moving joint is identified by the first digit in the symbol number, which would be?

A

one

52
Q

what is used to identify each type or style of packing and gaskets?

A

symbol number

53
Q

what does the second digit of the symbol number indicate?

A

packing or gasket composition

54
Q

how can practically all shipboard packing and gasket problems be solved?

A

by proper selection from the packing and gasket chart

55
Q

low pressure packing must never be used to pack what type of system valves?

A

high pressure

56
Q

what type of packing is constructed of 100 percent graphite?

A

Corrugated ribbon packing (CRP)

57
Q

what lubricates the corrugated ribbon packing?

A

graphite

58
Q

what kind of warning stickers must be affixed to all corrugated ribbon containers?

A

WARNING: CRP conducts electricity

59
Q

what is the purpose of using graphite filament yarn (GFY) for the first and last packing rings on valves packed with corrugated ribbon?

A

they are used as anti extrusion rings to prevent the corrugated ribbon packing from being forced out of the stuffing box

60
Q

what systems do not sue corrugated ribbon packing?

A

fuel oil and lube oil systems

61
Q

how is the outlet temperature of the inline desuperheater controlled?

A

by thermostatic and diaphragm control valve

62
Q

where can detailed information on the selection of insulation, lagging, and fastening be found?

A

NSTM 635

63
Q

a tubular product is called pipe if its size is identified by what?

A

Iron pipe size (IPS) and by reference to wall thickness schedule of piping

64
Q

how are flanges installed in nonferrous systems?

A

by brazing

65
Q

how are steel flanges installed?

A

by welding

66
Q

when removing lagging, if you are unsure of what material you are working with, who should you contact immediately?

A

your supervisor

67
Q

on ships with steam atomization, what is used to lag the atomization piping at the burner front?

A

epoxy coating

68
Q

what are three positions of the combination exhaust relief valve?

A

normal, relief and safety

69
Q

what position of the combination relief valve is used, when performing turbine overhaul?

A

safety position

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