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3A2 > Ch. 6 > Flashcards

Ch. 6 Flashcards

1
Q
  1. 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
  1. 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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2
Q
  1. 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
  1. 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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4
Q
  1. 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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4
Q
  1. 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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5
Q
  1. 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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6
Q
  1. 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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6
Q
  1. All valves must be properly identified as to the material of construction and the service conditions for which they are 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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7
Q
  1. ________ valve bodies in general can be used on water service up to temperatures of about 250°C.
    a. Brass
    b. Steel
    c. Steel alloys
    d. Cast-iron
    e. Stainless steel
A

d. Cast-iron

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7
Q
  1. 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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7
Q
  1. 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

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8
Q
  1. 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

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8
Q
  1. Name 3 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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8
Q
  1. 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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9
Q
  1. 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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9
Q
  1. A valve that the handwheel and stem rise as the handwheel is turned is called a ____________.
    a. hand lever
    b. outside screw threads
    c. rising stem
    d. inside screw threads
    e. disk rising on stem
A

c. rising stem

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10
Q
  1. List 4 methods of attaching a bonnet to a valve body:
    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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10
Q
  1. 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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11
Q
  1. 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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11
Q
  1. 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

12
Q
  1. The conventional disc globe valve is fairly ________ and popular 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

12
Q
  1. 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.

13
Q
  1. 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

14
Q
  1. 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

14
Q
  1. 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

14
Q
  1. In a balance plug design, downstream __________ acts on both the top and bottom of the valve plug, there by __________ most of the forces.
    a. flow, parting
    b. temperature, maintaining
    c. pressure, equalizing
    d. fluid, creating
A

c. pressure, equalizing

14
Q
  1. 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

15
Q
  1. 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

16
Q
  1. T-ported plug valves have ports in the plug in the shape of a cross.
    a. True
    b. False
A

b. False

16
Q
  1. 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

17
Q
  1. The eccentric plug valve, is specially 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

17
Q
  1. 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

B. False

18
Q
  1. Describe the diverter 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

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.

18
Q
  1. Describe Diaphragm Valve applications.
    A. Flow control service when handling corrosive and toxic fluids.
    B. Used extensively in raw water treatment plants, in sulfuric acid applications.
    C. A stream lined 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

18
Q
  1. 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

19
Q
  1. The diverting valve is a three-way valve, with _____ inlet and _____ outlets,
    a. two, one
    b. small, large
    c. one, two
    d. one, three
A

c. one, two

20
Q
  1. 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

20
Q
  1. Diaphragm valves have three 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

21
Q
  1. Maximum temperature of fluids handled must be below the temperature limit for the diaphragm material.
    a. True
    b. False
A

a. True

21
Q
  1. 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 lower 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

22
Q
  1. 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

22
Q
  1. The butterfly valve is often used as a final control element in ____ or large ______ piping systems.
    a. air, water
    b. gas, bore
    c. water, diameter
    d. oil, fluid
A

a. air, water

23
Q
  1. 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

24
Q
  1. 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

24
Q
  1. In a direct-operating valve, the solenoid plunger is used in place of a valve stem and hand-wheel. The plunger is connected 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

24
Q
  1. 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

25
Q
  1. 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

25
Q
  1. 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

25
Q
  1. Which best describes a spring-loaded diaphragm actuator?
    a. It 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. It a diaphragm and a diaphragm plate connected to an actuator stem.

26
Q
  1. 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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