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Valves & ACTUATORS > MIDTERM > Flashcards

MIDTERM Flashcards

1
Q

THE LAST ACTIVE ELEMENT OF A CONTROL LOOP

A

FINAL CONTROL ELEMENT

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2
Q

DEVICE THAT RECEIVES A CONTROL SIGNAL AND REGULATES THE AMOUNT OF MATERIAL OR ENERGY IN A PROCESS

A

FINAL ELEMENT

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3
Q

MOST COMMON FINAL ELEMENT

A

CONTROL VALVE

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4
Q

A VALVE BODY AND ACTUATOR THAT IS ABLE TO CONTROL FLUID FLOW AT ANY POSITION BETWEEN FULLY OPEN AND FULLY CLOSED

A

THROTTLING CONTROL VALVE

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5
Q

THE PATH THROUGH THE VALVE BODY FROM THE INLET TO THE OUTLET PORT

A

WAY

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6
Q

THE LOCATION WITHIN THE VALVE BODY WHERE INTERNAL PARTS ARE PLACED TO DIRECT FLUID FLOW THROUGH THE VALVE

A

POSITION

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7
Q

THE VALVE DOES NOT ALLOW THE PRESSURIZED FLUID TO FLOW OUT OF A VALVE IN THE SPRING ACTUATED POSITION.

A

NORMALLY CLOSED (N/C)

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8
Q

THE VALVE DOES ALLOW THE FLUID TO FLOW OUT OF A VALVE IN THE SPRING ACTUATED POSITION.

A

NORMALLY OPEN (N/O)

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9
Q

VALVE PLUG STEM
VALVE PLUG
CAGE
SEAT RING

A

PRIMARY TRIM COMPONENTS

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10
Q

PACKING
PACKING FLANGE
PACKING GLAND
FLUSHING RING

A

SECONDARY TRIM COMPONENTS

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11
Q

THE HOUSING COMPONENT OR SHELL OF THE VALVE. CONNECTED TO PROCESS VIA FLANGED OR THREADED PIPING CONNECTIONS

A

BODY

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12
Q

THE SEAL AREA AROUND RHE SLIDING STEM.

A

PACKING AND PACKING BOX

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13
Q

THE MOVING ASSEMBLY CONNECTED TO THE SLIDING STEM, MOVES IN AND OUT OF VALVE SEAT. ALSO REGULATES FLOW

A

DISC OR PLUG

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14
Q

THE PART OF THE VALVE THAT PROVIDES THE MOVEMENT OF THE STEM ASSEMBLY.

A

ACTUATOR

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15
Q

THE PUSHING AND PULLING ROD THAT TRANSFERS MOTION FROM THE ACTUATOR TO THE PLUG

A

STEM (SHAFT)

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16
Q

STATIONARY RECEIVER FOR THE PLUG

A

SEAT

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17
Q

FORCES THE VALVE STEM IN THE OPPOSITE DIRECTION OF THE DIAPHRAGM ASSEMBLY.

A

SPRING

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18
Q

FLEXIBLE DISK THAT TRANSFERS THE PNEUMATIC FORCE TO MOVE THE VALVE STEM

A

DIAPHRAM

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19
Q

MANUAL OVERRIDE THAT LIMITS THE MOTION OF THE VALVE, FORCES IT TO STAY OPEN, CLOSED, or THROTTLED

A

HANDWHEEL

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20
Q

CONVERTS AN ELECTRICAL SIGNAL TO PNEUMATIC SIGNAL

A

I/P TRANSDUCER

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21
Q

THREE FAIL SAFE MODES:

A
  1. F/C
  2. F/O
  3. FAIL LAST POSITION
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22
Q

2 ANSI EMERGENCY CLASSES

A

V & VI

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23
Q

WHAT IS THE EMERGENCY CLASS ?

A

ANY CLASS PAST VI

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24
Q

3 REQUIREMENTS FOR FIRESAFE SHUTOFF:

A
  1. WITHSTAND 45 MIN. OF DIRECT FLAME IMPINGEMENT
  2. ELEMENT AND SEAT MADE FROM DIFF. MATERIALS
  3. SEATS ARE SPRING LOADED TO PUSH INTO ELEMENT FOR COMPLETE SHUTOFF
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25
Q

TO ACHIEVE THE DESIRED SHUTOFF FOR A PARTICULAR APPLICATION.

A

VALVE LAPPING

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26
Q

IS APPLIED TO SEATING AREA OF ELEMENT CREATE AS TIGHT A SEAT TO ELEMENT MATCH AS POSSIBLE

A

LAPPING COMPOUND

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27
Q

50% = 80%

MAX FLOW WITH MINIMAL TRAVEL

A

QUICK OPENING CAGE

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28
Q

50% = 50%

EQUAL INCREMENTS OF TRAVEL

A

EQUAL PERCENTAGE

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29
Q

MINIMUM CROSS-SECTIONAL AREA OF THE FLOW STREAM AND OCCURS JUST DOWNSTREAM OF THE ACTUAL RESTRICTION

A

VENA CONTRACTA

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30
Q

PROCESS IN WHICH A PORTION OF THE LIQUID FLUID CONVERTS TO VAPOR. CHARACTERIZED AS SMOOTH,POLISHED APPEARANCE USUALLY AT THE SEAT LINE OF PLUG OR SEAT RING

31
Q

PROCESS IN WHICH VAPOR BUBBLES COLLAPSE INSIDE THE VALVE BODY.

A

CAVITATION

32
Q

WHEN THE SPEED OF A GAS INCREASES THAT IS ALREADY TRAVELING AT THE SPEEE OF SOUND CREATING WAVES

A

SONIC VELOCITY

33
Q

6 TYPES OF SLIDING STEM VALVES

A
  1. SINGLE PORTED
  2. DOUBLE PORTED
  3. 3 WAY
  4. Y-ANGLE
  5. SPLIT BODY
  6. 90• ANGLE
34
Q

3 CLASSES OF SLIDING STEM VALVES

A
  1. GLOBE VALVE
  2. GATE VALVE
  3. DIAPHRAGM
35
Q

GLOBE SHAPED PLUG SLIDES INTO A ROUND SEAT OR PORT. GENERALLY SINGLE PORTED

A

GLOBE CONTROL VALVE

36
Q

THROTTLING VALVE WHERE FLUID ENTERS HORIZONTALLY, MAKES A TURN THRU THE PLUG AND SEAT AND ANOTHER TURN TO EXIT THE VALVE

A

SINGLE PORTED GLOBE VALVE

37
Q

THIS VALVES PURPOSE IS TO MAXIMIZE FLOW THROUGH THE VALVE WHILE REDUCING THE PRESSURE DROP .

A

DOUBLE PORTED

38
Q

2 TYPES OF 3 WAY VALVES

A

DIVERTING - 1 INLET/2 OUTLETS
1 PRODUCT SENT 2 PLACES

MIXING - 2 INLETS/1 OUTLET 2 PRODUCTS MIXED TO MAKE A NEW PRODUCT

39
Q

THIS VALVE HAS 3 OPENINGS AND IS A SPECIAL TYPE OF GLOBE CONTROL VALVE

40
Q

THIS VALVE HAS NO PRESSURE DROP DUE TO STRAIGHT FLOW PATH. COMMONLY APPLIED IN MOLTEN METAL

41
Q

THESE VALVES ARE EASY TO REPAI AND ARE A MORE ECONOMICAL MAINTENANCE SOLUTION

A

SPLIT BODY

42
Q

ELIMINATES 1 OF THE 3 90 DEGREE TURNS IN THE FLOW PATH OF GLOBE BODY VALVES

A

90 DEGREE ANGLE

43
Q

VALVES DISTINGUISHED BY A FLAT OR WEDGE SHAPED PLATE THAT IS MOVED INTO OR OUT OF THE FLOW PATH.

A

GATE VALVE

44
Q

HOW TO CLOSE GATE VALVE:

A

GENTLY CLOSE UNTIL RESISTANCE IS FELT

OPEN 1 FULL TURN,HESITATE SO DEBRIS AND SCALE FROM SEAT

FULLY RETIGHTEN

45
Q

2 TYPES OF GATE VALVES

A

MULTI-ORFICE: USED IN THROTTLING APPLICATIONS

V-ORFICE: ABILITY TO SHEAR THRU FLOW OF SUSPENDED SOLID MATERIALS

46
Q

THIS VALVE USES A SOFT DIAPHRAGM AGAINST A HARDENED RIGID WEIR SURFACE TO STOP FLOW.

A

SAUNDERS VALVES (SPHINCTER)

47
Q

THIS VALVE USES A FLEXIBLE TUBE SECTION TRAPPED BETWEEN 2 RIGID FORMING VISE LIKE BARS.

BETTER IN LIQUID SERVICE, LEAKS ARE EASY TO DETECT

A

PINCH VALVE

48
Q

MOST POPULAR TYPE OF GLOBE

A

SINGLE PORT

49
Q

WHAT ARE SLIDING STEM VALVES ALSO KNOWN AS

A

RISING STEM VALVES

50
Q

4 TYPES OF ACTUATORS

A

DIAPHRAGM & SPRING
PISTON
ROTARY SHAFT ACTUATORS
MANUAL OPERATORS

51
Q

A DEVICE THAT RESPONDS TO AN INSTRUMENT BY CREATING A LINEAR OR ROTATIONAL MOVEMENT. WHAT MAKES A VALVE A CONTROL VALVE

52
Q

PRESSURE TO FORCE CONVERTOR USING A CIRCULAR DIAPHRAGM TO TRANSMIT FORCE TO A THRUST ROD.

A

DIAPHRAGM & SPRING

53
Q

ARE DIRECT ACTING AND REVERSE ACTING.

54
Q

DIAPHRAGM AND SPRING 4 POSSIBLE COMBINATIONS

A

DIRECT/DIRECT : (FO)
DIRECT/REVERSE: (FC)
REVERSE/DIRECT: (FC)
REVERSE/REVERSE: (FO)

55
Q

IS GENERALLY MOLDED FROM A FABRIC REINFORCED ELASTOMER THAT IS FLEXIBLE AND PLACED BETWEEN 2 CASINGS

56
Q

ADVANTAGES AND DISADVANTAGES OF DIAPHRAGM AND SPRING VALVES:

A

ADV: LOW COST & HIGH PERFORMANCE

DISADVANTAGE: LENGTH OF STROKE AND AMOUNT OF FORCE THAT CAN BE DEVELOPED

57
Q

PRE-CALIBRATION ALIGNMENT WHERE ACTUATOR IS SEPARATED FROM THE VALVE.

3-11 or 15-6 PSI

58
Q

2 PNEUMATICALLY ACTUATED GLOBE VALVES:

A

DIAPHRAGM ACTUATED GLOBE VALVE

PISTON ACTUATED GLOBE VALVE

59
Q

2 TYPES OF PISTON STYLE VALVES:

A

SINGLE ACTING: DEFINITE FAIL POSITION

DOUBLE ACTING: FAIL LAST POSITION.
*REQUIRES PRESSURE ON BOTH SIDES OF THE PISTON

60
Q

2 TYPES OF SINGLE ACTING PISTON TYPE ACTUATORS:

A

SPRING OPPOSED

COMPRESSED AIR OPPOSED

61
Q

ADVANTAGES AND DISADVANTAGES OF PISTON STYLE:

A

ADV: GREATER FORCE, SMALL FOOTPRINT & STROKE LENGTH 3-6 INCHES
DISADVANTAGES: NEED CLEAN DRY AIR & HAS TO BE REPLACE IF DAMAGED

62
Q

AS AIR ON ONE SIDE REDUCES, THE OTHER SIDE INCREASES MOVING THE VALVE FROM OPEN TO CLOSED. MUST BE CONTROLLED WITH A VALVE POSITIONER

A

DOUBLE ACTING PISTON TYPE ACTUATOR

63
Q

3 ROTARY ACTION STYLE VALVES

A

RACK & PINION
ELECTROMECHANICAL
DIAPHRAGM

64
Q

IN THIS VALVE AIR ENTERS ONE PORT FORCING PISTONS OUTWARDS TURNING IT COUNTER CLOCKWISE WHILE AIR IS EXHAUSTED FROM THE SECOND PORT

A

RACK & PINION

65
Q

IN THIS VALVE THE ELECTRIC MOTOR IS CONNECTED THROUGH A WORM GEAR TO CONVERT ROTARY ACTION INTO LINEAR MOTION TO MOVE A VALVE STEM

A

ELECTROMECHANICAL

66
Q

IN THIS ROTARTY ACTION STYLE VALVE THE STEM AND CONNECTOR ARE REPLACED WITH AN ACTUATOR ROD THAT IS CONNECTED TO ACTUATOR LEVER TO SHAFT OF VALVE

67
Q

VALVE POSITION IS DETERMINED BY SIGHT.

TALL STEM = OPEN VALVE…. SHORT STEM= CLOSED VALVE.

A

RISING STEM VALVE

68
Q

MANUAL OPERATOR STYLE VALVES:

A
  1. COMMON ON GATE VALVES

2. MOUNTED ON TOP OR SIDE

69
Q

2 MOST BASIC PNEUMATIC ACTUATORS ARE :

A

DIAPHRAGM & PISTON

70
Q

DIAPHRAGM ACTUATORS ARE MADE FOR 2 DIFF. FUNCTIONS:

A

DIRECT ACTING

REVERSE ACTING

71
Q

“RISING STEM” ACTUATORS ARE OFTEN CALLED :

A

MANUAL OPERATOR STYLE ACTUATORS

72
Q

WHICH TYPE OF ACTUATOR HAS “INHERENT INERTIA ISSUES”

A

ROTARY ACTION STYLE- ELECTROMECHANICAL

73
Q

WHAT IS THE DIFFERENCE BETWEEN SINGLE AND DOUBLE ACTING?

A

DOUBLE: REQUIRES PRESSURE ON BOTH SIDES OF PISTON TO BE VARIED TO CONTROL VALVE POSITION

Valves & ACTUATORS (1 decks)

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