Post on 23-Dec-2015
Air Operated Valve CalibrationNMV21
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Terminal Objective
Given the necessary references, tools and test equipment, the technician will maintain pneumatic control valve components. Mastery will be demonstrated by completion of all Laboratory Practical Evaluations and scoring at least 80 % on an end of course exam.
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Enabling Objectives
Given an example or illustration, identify the types of control valves.
Given an example or illustration, identify components associated with various valve types.
Identify flow characteristics of various valves .
Describe the operation of Pneumatic Actuators.
Describe the critical elements associated with valve packing.
Describe the operation of a flapper/nozzle detector.
Describe the operation of a booster relay.
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Enabling Objectives
Describe the operation of air regulators.
Describe the operation of valve position indication devices.
Describe the use and operation of solenoid valves on air operated valves.
Calibrate a Fisher 546 I/P Converter.
Benchset diaphragm actuators.
Calibrate Valve Positioners.
Calibrate a Steam Bypass Control Valve.
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Typical Globe Valves
FLOW
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Typical Gate Valves
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Typical Butterfly Valves
FLOW
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Typical Check Valves
FLOW
FLOW
SPRING
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Typical Diaphragm Valve
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Typical Ball Valve
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Typical Plug Valves
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Typical Globe Valve ConstructionValve Body
Two Way Three Way
Bonnet
Packing Flange
Packing
Valve Stem
Valve Plug
Seat
Cage
13Some Globe Valve Plugs (discs)
Various plugs shown in
yellow
Guided Disc
Basic Plug Disc
Composition Disc
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Globe Valve Ports and Action
Reverse Action(down to open)
FLOW
Double-Ported Globe Valve
FLOW
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Typical Gate Valve Construction
Valve Body
Bonnet
Packing Flange
PackingValve Stem
Split Disc Solid Disc
Valve Seat
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Typical Butterfly Valve Construction
Valve Body
Packing Flange
Valve Stem
Valve Disc
Valve Seat
Bearings
Packing
Packing
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Typical Ball Valve Construction
Valve Body
Packing Flange
Packing
Valve Stem
Ball
Valve Seat
Bearings
Bonnet
18% Valve Travel
% F
low
0
100
100
50
50
75
75
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Linea
r
Qui
ck O
peni
ng
Equa
l Per
cent
age
Ideal FlowCharacteristics
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Plug and Seat Flow Characterization
Linear Equal Percentage
Quick Opening
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Trim Cage Flow Characterization
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Drag Valve Trim
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Diaphragm Actuator Construction
Diaphragm Casings
Diaphragm
Diaphragm Plate
Actuator Spring
Actuator Stem
Spring Seat
Spring Adjustor
Stem Connector
Travel Indicator Disk
Indicator Scale
Yoke
Seal Bushing
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O-RingPositioner
Piston Rod Extension
Piston Rod Boot
Cylinder
Piston / Rod
Lower Seal Bushing
Upper Seal Bushing
Yoke
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Braided Ring
Braided Ring
Graphite Rings
CarbonSpacer
PackingGlandFollower
Va
lve
Ste
m
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Fisher 3582 Positioner
Principle of Operation
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Fisher 3582Positioner
Construction
Travel Adjustment ScrewInput
Cam Beam
Pivot Pin
Flapper
Follower Assembl
y
Nozzle
Input Bellows
Rotary Shaft Arm
Nozzle
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Cam
Guide & Roller BearingBeam
Fisher 3582 Wear Points
Beam Off Center
Cam
Guide Wear
Roller Wear and Cut
Wear caused by Guide (“locked valve position”)
Wear caused by siezed roller
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Fisher 3570PositionerPrinciple of Operation
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3570 Positioner
Construction
Air Supply
Cylinder (Top)
Cylinder (bottom)Input
Bias Spring
Range Spring
Horizontal Relay
Vertical Relay
Input Bellows
Bellows Post
Beam
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NAMCO Position Switches
Operating Lever
Clamping Screw
Lever Locking Pipe PlugContacts
Cover / Gasket
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Simplified LVDT
PositionSignals
Excitation
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P&ID symbols for SOV’s
S
S
S
S
S
S
De-Energized Energized
2-Way
3-Way
4-Way
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Typical SOV Construction
Coil
Cover
Yoke
Housing
Solenoid Base
Core Assembly
Body
Disc Assembly
End Cap
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Fisher 546 I/P
39Fisher 546 I/P Construction
Air SupplyOutp
ut
Input
Zero
Span
Torque Motor
AssemblyShunt Pivot(behind Torque
Motor)
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FO
FO
FC
FC
FC
FC
S
S
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FO
FO
FC
FC
FC
FC
S
S
S
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FO
FO
FC
FC
FC
FC
S
S
S
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