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Valves & ACTUATORS > MIDTERM > Flashcards

MIDTERM Flashcards

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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
TO ACHIEVE THE DESIRED SHUTOFF FOR A PARTICULAR APPLICATION.
VALVE LAPPING
26
IS APPLIED TO SEATING AREA OF ELEMENT CREATE AS TIGHT A SEAT TO ELEMENT MATCH AS POSSIBLE
LAPPING COMPOUND
27
50% = 80% MAX FLOW WITH MINIMAL TRAVEL
QUICK OPENING CAGE
28
50% = 50% | EQUAL INCREMENTS OF TRAVEL
EQUAL PERCENTAGE
29
MINIMUM CROSS-SECTIONAL AREA OF THE FLOW STREAM AND OCCURS JUST DOWNSTREAM OF THE ACTUAL RESTRICTION
VENA CONTRACTA
30
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
FLASHING
31
PROCESS IN WHICH VAPOR BUBBLES COLLAPSE INSIDE THE VALVE BODY.
CAVITATION
32
WHEN THE SPEED OF A GAS INCREASES THAT IS ALREADY TRAVELING AT THE SPEEE OF SOUND CREATING WAVES
SONIC VELOCITY
33
6 TYPES OF SLIDING STEM VALVES
1. SINGLE PORTED 2. DOUBLE PORTED 3. 3 WAY 4. Y-ANGLE 5. SPLIT BODY 6. 90• ANGLE
34
3 CLASSES OF SLIDING STEM VALVES
1. GLOBE VALVE 2. GATE VALVE 3. DIAPHRAGM
35
GLOBE SHAPED PLUG SLIDES INTO A ROUND SEAT OR PORT. GENERALLY SINGLE PORTED
GLOBE CONTROL VALVE
36
THROTTLING VALVE WHERE FLUID ENTERS HORIZONTALLY, MAKES A TURN THRU THE PLUG AND SEAT AND ANOTHER TURN TO EXIT THE VALVE
SINGLE PORTED GLOBE VALVE
37
THIS VALVES PURPOSE IS TO MAXIMIZE FLOW THROUGH THE VALVE WHILE REDUCING THE PRESSURE DROP .
DOUBLE PORTED
38
2 TYPES OF 3 WAY VALVES
DIVERTING - 1 INLET/2 OUTLETS 1 PRODUCT SENT 2 PLACES MIXING - 2 INLETS/1 OUTLET 2 PRODUCTS MIXED TO MAKE A NEW PRODUCT
39
THIS VALVE HAS 3 OPENINGS AND IS A SPECIAL TYPE OF GLOBE CONTROL VALVE
3 WAY
40
THIS VALVE HAS NO PRESSURE DROP DUE TO STRAIGHT FLOW PATH. COMMONLY APPLIED IN MOLTEN METAL
Y ANGLE
41
THESE VALVES ARE EASY TO REPAI AND ARE A MORE ECONOMICAL MAINTENANCE SOLUTION
SPLIT BODY
42
ELIMINATES 1 OF THE 3 90 DEGREE TURNS IN THE FLOW PATH OF GLOBE BODY VALVES
90 DEGREE ANGLE
43
VALVES DISTINGUISHED BY A FLAT OR WEDGE SHAPED PLATE THAT IS MOVED INTO OR OUT OF THE FLOW PATH.
GATE VALVE
44
HOW TO CLOSE GATE VALVE:
GENTLY CLOSE UNTIL RESISTANCE IS FELT OPEN 1 FULL TURN,HESITATE SO DEBRIS AND SCALE FROM SEAT FULLY RETIGHTEN
45
2 TYPES OF GATE VALVES
MULTI-ORFICE: USED IN THROTTLING APPLICATIONS V-ORFICE: ABILITY TO SHEAR THRU FLOW OF SUSPENDED SOLID MATERIALS
46
THIS VALVE USES A SOFT DIAPHRAGM AGAINST A HARDENED RIGID WEIR SURFACE TO STOP FLOW.
SAUNDERS VALVES (SPHINCTER)
47
THIS VALVE USES A FLEXIBLE TUBE SECTION TRAPPED BETWEEN 2 RIGID FORMING VISE LIKE BARS. BETTER IN LIQUID SERVICE, LEAKS ARE EASY TO DETECT
PINCH VALVE
48
MOST POPULAR TYPE OF GLOBE
SINGLE PORT
49
WHAT ARE SLIDING STEM VALVES ALSO KNOWN AS
RISING STEM VALVES
50
4 TYPES OF ACTUATORS
DIAPHRAGM & SPRING PISTON ROTARY SHAFT ACTUATORS MANUAL OPERATORS
51
A DEVICE THAT RESPONDS TO AN INSTRUMENT BY CREATING A LINEAR OR ROTATIONAL MOVEMENT. WHAT MAKES A VALVE A CONTROL VALVE
ACTUATORS
52
PRESSURE TO FORCE CONVERTOR USING A CIRCULAR DIAPHRAGM TO TRANSMIT FORCE TO A THRUST ROD.
DIAPHRAGM & SPRING
53
ARE DIRECT ACTING AND REVERSE ACTING.
ACTUATORS
54
DIAPHRAGM AND SPRING 4 POSSIBLE COMBINATIONS
DIRECT/DIRECT : (FO) DIRECT/REVERSE: (FC) REVERSE/DIRECT: (FC) REVERSE/REVERSE: (FO)
55
IS GENERALLY MOLDED FROM A FABRIC REINFORCED ELASTOMER THAT IS FLEXIBLE AND PLACED BETWEEN 2 CASINGS
DIAPHRAGM
56
ADVANTAGES AND DISADVANTAGES OF DIAPHRAGM AND SPRING VALVES:
ADV: LOW COST & HIGH PERFORMANCE DISADVANTAGE: LENGTH OF STROKE AND AMOUNT OF FORCE THAT CAN BE DEVELOPED
57
PRE-CALIBRATION ALIGNMENT WHERE ACTUATOR IS SEPARATED FROM THE VALVE. 3-11 or 15-6 PSI
BENCH SET
58
2 PNEUMATICALLY ACTUATED GLOBE VALVES:
DIAPHRAGM ACTUATED GLOBE VALVE PISTON ACTUATED GLOBE VALVE
59
2 TYPES OF PISTON STYLE VALVES:
SINGLE ACTING: DEFINITE FAIL POSITION DOUBLE ACTING: FAIL LAST POSITION. *REQUIRES PRESSURE ON BOTH SIDES OF THE PISTON
60
2 TYPES OF SINGLE ACTING PISTON TYPE ACTUATORS:
SPRING OPPOSED | COMPRESSED AIR OPPOSED
61
ADVANTAGES AND DISADVANTAGES OF PISTON STYLE:
ADV: GREATER FORCE, SMALL FOOTPRINT & STROKE LENGTH 3-6 INCHES DISADVANTAGES: NEED CLEAN DRY AIR & HAS TO BE REPLACE IF DAMAGED
62
AS AIR ON ONE SIDE REDUCES, THE OTHER SIDE INCREASES MOVING THE VALVE FROM OPEN TO CLOSED. MUST BE CONTROLLED WITH A VALVE POSITIONER
DOUBLE ACTING PISTON TYPE ACTUATOR
63
3 ROTARY ACTION STYLE VALVES
RACK & PINION ELECTROMECHANICAL DIAPHRAGM
64
IN THIS VALVE AIR ENTERS ONE PORT FORCING PISTONS OUTWARDS TURNING IT COUNTER CLOCKWISE WHILE AIR IS EXHAUSTED FROM THE SECOND PORT
RACK & PINION
65
IN THIS VALVE THE ELECTRIC MOTOR IS CONNECTED THROUGH A WORM GEAR TO CONVERT ROTARY ACTION INTO LINEAR MOTION TO MOVE A VALVE STEM
ELECTROMECHANICAL
66
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
DIAPHRAM
67
VALVE POSITION IS DETERMINED BY SIGHT. | TALL STEM = OPEN VALVE.... SHORT STEM= CLOSED VALVE.
RISING STEM VALVE
68
MANUAL OPERATOR STYLE VALVES:
1. COMMON ON GATE VALVES | 2. MOUNTED ON TOP OR SIDE
69
2 MOST BASIC PNEUMATIC ACTUATORS ARE :
DIAPHRAGM & PISTON
70
DIAPHRAGM ACTUATORS ARE MADE FOR 2 DIFF. FUNCTIONS:
DIRECT ACTING | REVERSE ACTING
71
“RISING STEM” ACTUATORS ARE OFTEN CALLED :
MANUAL OPERATOR STYLE ACTUATORS
72
WHICH TYPE OF ACTUATOR HAS “INHERENT INERTIA ISSUES”
ROTARY ACTION STYLE- ELECTROMECHANICAL
73
WHAT IS THE DIFFERENCE BETWEEN SINGLE AND DOUBLE ACTING?
DOUBLE: REQUIRES PRESSURE ON BOTH SIDES OF PISTON TO BE VARIED TO CONTROL VALVE POSITION

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