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3A2 > 3A2 Chapter 06 > Flashcards

3A2 Chapter 06 Flashcards

1
Q

In valve selection an examination of the fluid to be handled is made to determine its ______ and ______

A) mass, viscosity
B) properties, characteristics
C) texture, corrosiveness
D) color, odor

A

B) properties, characteristics

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2
Q

Fluid friction loss and pressure drop are inherent losses that are responsible for a major portion of the total energy loss in many fluid handling systems

A) true
B) false

A

A) true

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3
Q

The gate valve, consists of a gate like _______ , actuated by a screwed stem and hand wheel, which moves up and down at ____ ______ to the flow

A) disc, right angles
B) stopper, close proximity
C) metal, slow speed
D) device, more distance

A

A) disc, right angles

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4
Q

Globe valves have the largest pressure drop or head loss of the valve types

A) true
B) false

A

A) true

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5
Q

Valve sizes are selected in accordance with the ______ needed and permissible fluid friction ______

A) size, characteristics
B) capacity, losses
C) service, numbers
D) agency, advantage

A

B) capacity, losses

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6
Q 
List factors involved in valve selection:
A) economics
B) corrosion
C) shape
D) valve lifespan
E) process reliability

A) a,b
B) a,b,c,d
C) a,b,c,e
D) a,b,d,e

A

D) a,b,d,e

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7
Q

The valve trim refers to the valve _____ and ______

A) wheel, stem
B) bonnet, packing
C) disc, seat
D) inlet, outlet

A

C) disc, seat

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8
Q

Variables effecting material selection are:
A) the process fluid and its temperature
B) the pressure range that the system will operate in
C) the ambient temperature
D) if the process fluid is very corrosive

A) a,b,d
B) a,b,d
C) a,b
D) b,c,d

A

A) a,b,d

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9
Q

All valves must be properly identified as to the material of construction and the service conditions for which they were designed, the following basic information:

1) manufacturer’s name or trademark
2) type of weather proof insulation required
3) service designation, for example, pressure - temperature for which the fitting is designated
4) material designation, for example, steel or cast iron, and ASTM number

A) 1,2,3
B) 1,2,4
C) 1,2,3,4
D) 1,3,4

A

D) 1,3,4

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10
Q

Generally, in gate valves, the parts most severely worn are the discs and seats

A) true
B) false

A

A) true

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11
Q

_____ valve bodies in general can be used on water service up to temperatures of about 250 degrees C

A) brass
B) steel
C) steel alloys
D) cast iron
E) stainless steel
A

D) cast iron

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12
Q

Name three types of gate design:

A) flexible, full, split
B) solid, flexible, split
C) solid, flexible, hinged
D) solid, movable, split

A

B) solid, flexible, split

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13
Q

A V shaped insert type valve would be used as a control valve as flow characteristics are usually more ______

A) straight
B) flatter
C) linear
D) mixed

A

C) linear

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14
Q

In the outside screw and yoke valve, the stem threads are outside of the valve, and therefore, are subject to extreme temperature changes with resulting galling

A) true
B) false

A

B) false

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15
Q

A valve that the hand wheel and stem rise as the hand wheel is turned is called a:

A) hand lever
B) outside screw threads
C) rising stem
D) inside screw threads
E) disc rising on stem
A

C) rising stem

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16
Q 
List four methods of attaching a bonnet to a valve bonnet:
A) welded
B) union
C) flanged
D) threaded
E) Molded
F) compression fit

A) a,b,c,e,f
B) b,c,e,f
C) a,b,c
D) a,b,c,d

A

D) a,b,c,d

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17
Q 
Globe valves are used for:
A) throttling
B) controlling fluid flow
C) positive isolation
D) quick opening
E) abrasive fluids

A) a,b
B) a,b,c
C) a,b,c,d
D) a,b,c,d,e

A

A) a,b

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18
Q

The conventional disc globe valve is fairly _____ and populate in low pressure service where severe ______ is not required

A) cheap, throttling
B) small, space
C) expensive, temperature
D) reasonable, costs

A

A) cheap, throttling

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19
Q

The composition disc valve, is an improvement over the ball type disc for many services, and is most suitable for throttling purposes

A) true
B) false

A

B) false

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20
Q

The plug type globe valve is the best of the three types for ____ and ____ service

A) cost, maintenance
B) throttling, hard
C) size, hot
D) strength, wide

A

B) throttling, hard

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21
Q

High pressure single ported globe bodies, or plug type, are often used in production of ____ and ________

A) steam, Boiler feed water
B) oil, gas
C) acid, caustic
D) butane, propane

A

B) oil, gas

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22
Q

Balance valves have nearly the same pressure on the top and bottom of the valve plug. This greatly reduces the mechanical effort required to move the valve or to hold it in a steady position

A) true
B) false

A

A) true

23
Q

The single seated balance valve, has a _______ _______ moving inside a removable cage, which holds down a seating ring

A) large hole
B) valve plug
C) tapered stem
D) round disc

A

B) valve plug

24
Q

Describe the double seated balance valve

A) it has a valve plug that moves inside a removable cage, which holds down a seating ring
B) a valve body with cage style trim, balanced plug and soft seat. It is single ported as only one seat ring is used
C) it can pass up to twice as much fluid as a single port valve. It generally divides the flow in half through two control ports
D) downstream pressure acts on both the top and bottom of the valve plug, thereby equalizing most of the forces

A

C) it can pass up to twice as much fluid as a single port valve. It generally divides the flow in half through two control ports

25
Q

In a balance plug design, downstream _______ acts on both the top and bottom of the valve plug, thereby _____ most of the forces

A) flow, parting
B) temperature, maintaining
C) pressure, equalizing
D) fluid, creating

A

C) pressure, equalizing

26
Q

Match the valves with their descriptors:
A) single seated balance valve
B) double seated balance valve
C) balanced plug
1) cage style trim is used to provide valve plug guiding, seat ring retention, and flow characterization
2) has a valve plug that moves inside a removable cage, which holds down a seating ring
3) divides the flow in half through two control ports

A) a/1, b/2, c/3
B) a/2, b/1, c/3
C) a/3, b/2, c/1
D) a/2, b/3, c/1

A

D) a/2, b/3, c/1

27
Q

Plug valves consist of a tapered or straight vertical cylinder _____ into a valve body

A) welded
B) threaded
C) pressed
D) inserted

A

D) inserted

28
Q

The plug turns with the help of a _____ or is _______ operated

A) motor, manual
B) wrench, gear
C) piston, automatically
D) wheel, gear

A

B) wrench, gear

29
Q 
List plug valve gland types:
A) single gland
B) double gland
C) button gland
D) bolted gland
E) piston gland
F) screwed gland

A) a,c,d,f
B) a,d,f
C) a,b,d,f
D) a,c,d,e

A

B) a,d,f

30
Q

T ported plug valves have ports in the plug in the shape of a cross

A) true
B) false

A

B) false

31
Q

The eccentric plug valve, is especially designed for _______

A) tight spaces, as the body is very small
B) applications when 4 or more systems must be connected
C) severe rotary applications, as it features tight shut off with globe style seating
D) large oil and gas facilities

A

C) severe rotary applications, as it features tight shut off with globe style seating

32
Q

What is the purpose of the bolted jacket(s)?

A) to strengthen the valve body
B) prevent valve leaks
C) provide a smooth surface for painting
D) apply heat to the valve body

A

D) apply heat to the valve body

33
Q

The mixing valve is designed with two _____ and one ____ for blending two fluids

A) flanges, drain
B) inlets, discharge
C) stems, gate
D) glands, body

A

B) inlets, discharge

34
Q

Regarding a mixing valve, when the plug is fully down then the bottom inlet is open. When the plug is fully raised, the side inlet flow is shut off

A) true
B) false

A

A) true

35
Q

The diverting valve equipment a three way valve, with ____ inlet, and ____ outlets

A) two, one
B) small, large
C) one, two
D) one, three

A

C) one, two

36
Q

Describe the diver valve operation:

A) moving the valve stem varies the proportion of liquid or gas entering each of the inlets. There is a continuous flow from the outlet regardless of the valve plug position
B) the inlet pressure acts equally on both valve plugs, reducing the force needed to move the valve stem. An unbalanced force will be produced if one discharge line has a higher pressure than the other discharge line
C) when the plug is fully down, the bottom inlet is shut off. When the plug is fully raised, the side inlet flow is shut off. Any intermediate position proportions the two inlet flows to meet the operating needs
D) the valve may maintain a constant level of fluid in a vessel, but if the inlet flow is too high when the level is maximum, the excess input can be diverted to another vessel

A

B) the inlet pressure acts equally on both valve plugs, reducing the force needed to move the valve stem. An unbalanced force will be produced if one discharge line has a higher pressure than the other discharge line

37
Q

Describe diaphragm valve applications
A) flow control service when handling corrosive and toxic fluids
B) used extensively in raw water treatment plants, in sulphuric acid applications
C) a streamlined valve for installation in small places
D) generally in services where bubble tight or drip tight closure is mandatory
E) mostly used for Boiler feed water ingestion

A) a,b,d
B) a,b,c,d
C) a,b,e
D) b,c,d,e

A

A) a,b,d

38
Q

Diaphragm valves have thee basic parts: the valve ____, the valve ____ assembly, and the flexible disc or ______

A) actuator, stem, body
B) body, bonnet, diaphragm
C) body, seat, packing
D) inlet, outlet, seat

A

B) body, bonnet, diaphragm

39
Q 
Diaphragms are made of any of materials resistant to the particular fluids being transported. Choose four:
A) rubber
B) neoprene
C) cloth
D) stainless steel
E) polyethylene
F) tin foil

A) b,c,d,e
B) b,d,e
C) a,b,c,e
D) a,b,d,e

A

D) a,b,d,e

40
Q

Maximum temperature of fluids handle must be below the temperature limit for the diaphragm material

A) true
B) false

A

A) true

41
Q

List advantages of diaphragm valves:

1) the diaphragm is separated from the fluid and no packing material is required as in conventional valves
2) maintenance costs are much l wet than conventional valves
3) the bonnet assembly can be removed for cleaning or lubricating without shutting off the fluid in the line
4) a positive tight seal is always maintained
5) diaphragm valves can be used in all services

A) 1,2
B) 2,3
C) 1,3
D) 3,4
E) 2,5
A

C) 1,3

42
Q

The butterfly valve is often used as a final control valve element in ____ or large _____ piping systems

A) air, water
B) gas, bore
C) water, diameter
D) oil, fluid

A

A) air, water

43
Q

List the two ways butterfly valves are installed into a piping system:

1) welded
2) unions
3) flanged
4) wafer
5) glues

A) 1,2
B) 2,3
C) 3,4
D) 4,5
E) 1,5
A

C) 3,4

44
Q

List the three subcategories of butterfly valves

1) swing through
2) large
3) small
4) lined
5) high performance

A) 1,2,3
B) 3,4,5
C) 1,4,5
D) 2,3,4
E) 1,3,5
A

C) 1,4,5

45
Q

High performance butterfly valves have an eccentric shaft mounting allowing the disc to swing clear of the seal to minimize wear and torque

A) true
B) false

A

A) true

46
Q

Gears provide a mechanical advantage permitting ______ ______ to operate the valve, where _____ might otherwise be needed

A) small people, large
B) one person, two
C) large valves, small valves
D) motors, manual

A

B) one person, two

47
Q

In a direct operating valve, the solenoid plunger is used in place of a valve stem and hand wheel. The plunger is connect directly to the disc of a globe valve. As the solenoid coil is energized or de-energized, the plunger rises or falls, opening or closing the valve

A) true
B) false

A

A) true

48
Q

Where are solenoid valves used?

1) small size systems where on and off operation is required
2) fuel gas systems as the latching valve
3) cooling water systems
4) continuous flow control

A) 1,4
B) 2,4
C) 1,2
D) 2,3
E) 3,4
A

C) 1,2

49
Q

What are the advantages of electrical valve operators?

1) can be set up for operation from several different locations; remotely operated
2) remote indicating devices can be installed to show the position of the valve at any operating station
3) valve operating speeds (to close the valve) from two seconds for some units, to four minutes can be reached
4) valves can be operated without personnel having to climb ladders or enter dangerous locations

A) 1,2,3,4
B) 2,3,4
C) 3,4
D) 4

A

A) 1,2,3,4

50
Q

Which best describes a spring loaded diaphragm actuator?

A) is a diaphragm and a diaphragm plate connected to an actuator stem
B) the adjusting spring allows external setting or adjustment of the initial spring compression
C) has no springs and are often used in applications requiring a valve positioner
D) are employed in small size systems where on and off operation is required

A

A) is a diaphragm and a diaphragm plate connected to an actuator stem

51
Q

List the two ways butterfly valves are installed into a piping system:

1) welded
2) unions
3) flanged
4) wafer
5) glues

A) 1,2
B) 2,3
C) 3,4
D) 4,5
E) 1,5
A

C) 3,4

52
Q

List the three subcategories of butterfly valves

1) swing through
2) large
3) small
4) lined
5) high performance

A) 1,2,3
B) 3,4,5
C) 1,4,5
D) 2,3,4
E) 1,3,5
A

C) 1,4,5

53
Q

High performance butterfly valves have an eccentric shaft mounting allowing the disc to swing clear of the seal to minimize wear and torque

A) true
B) false

A

A) true

54
Q

Pneumatic or hydraulic piston actuators are used when the force required in moving a valve or a damper is higher than that which can be provided by a diaphragm actuator

A) true
B) false

A

A) true

3A2 (15 decks)

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