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Air Operated Valve Calibration NMV21

Air Operated Valve Calibration NMV21. Terminal Objective.

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Air Operated Valve Calibration NMV21

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  1. Air Operated Valve CalibrationNMV21

  2. 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.

  3. 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.

  4. 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.

  5. FLOW Typical Globe Valves

  6. Typical Gate Valves

  7. FLOW Typical Butterfly Valves

  8. SPRING FLOW FLOW Typical Check Valves

  9. Typical Diaphragm Valve

  10. Typical Ball Valve

  11. Typical Plug Valves

  12. Valve Body Two Way Three Way Packing Flange Packing Cage Bonnet Valve Stem Valve Plug Seat Typical Globe Valve Construction

  13. Various plugs shown in yellow Basic Plug Disc Composition Disc Guided Disc Some Globe Valve Plugs (discs)

  14. FLOW FLOW Reverse Action(down to open) Double-Ported Globe Valve Globe Valve Ports and Action

  15. Packing Flange Valve Stem Packing Bonnet Valve Seat Split Disc Solid Disc Typical Gate Valve Construction Valve Body

  16. Packing Packing Packing Flange Valve Stem Valve Body Valve Disc Valve Seat Bearings Typical Butterfly Valve Construction

  17. Valve Body Valve Seat Ball Valve Stem Bearings Bonnet Packing Packing Flange Typical Ball Valve Construction

  18. 100 75 Linear 50 % Flow Quick Opening Equal Percentage 25 Ideal FlowCharacteristics 0 25 100 75 50 % Valve Travel

  19. Linear Equal Percentage Quick Opening Plug and Seat Flow Characterization

  20. Trim Cage Flow Characterization

  21. Drag Valve Trim

  22. Spring Seat Spring Adjustor Stem Connector Travel Indicator Disk Diaphragm Casings Diaphragm Diaphragm Plate Seal Bushing Actuator Spring Actuator Stem Indicator Scale Yoke Diaphragm Actuator Construction

  23. O-Ring Positioner Piston Rod Extension Upper Seal Bushing Cylinder Piston / Rod Lower Seal Bushing Piston Rod Boot Yoke

  24. PackingGlandFollower Valve Stem Braided Ring Graphite Rings Braided Ring CarbonSpacer

  25. Fisher 3582 Positioner Principle of Operation

  26. Travel Adjustment Screw Pivot Pin Input Cam Beam Nozzle Follower Assembly Rotary Shaft Arm Flapper Input Bellows Fisher 3582Positioner Construction Nozzle

  27. Roller Wear and Cut Guide Wear Guide & Roller Bearing Beam Wear caused by Guide (“locked valve position”) Cam Beam Off Center Wear caused by siezed roller Cam Fisher 3582 Wear Points

  28. Fisher 3570PositionerPrinciple of Operation

  29. Input Bellows Range Spring Beam Horizontal Relay Cylinder (Top) Bias Spring Air Supply Bellows Post 3570 Positioner Construction Cylinder (bottom) Vertical Relay Input

  30. Operating Lever Cover / Gasket Clamping Screw Lever Locking Pipe Plug Contacts NAMCO Position Switches

  31. Simplified LVDT

  32. De-Energized Energized S S 2-Way S S 3-Way S S 4-Way P&ID symbols for SOV’s

  33. Cover Core Assembly Yoke Body Coil Disc Assembly End Cap Housing Solenoid Base Typical SOV Construction

  34. Fisher 546 I/P

  35. Zero Air Supply Output Torque MotorAssembly Span Shunt Pivot(behind Torque Motor) Input Fisher 546 I/P Construction

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