Air Operated Valve Calibration NMV21

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.

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.

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.

FLOW Typical Globe Valves

Typical Gate Valves

FLOW Typical Butterfly Valves

SPRING FLOW FLOW Typical Check Valves

Typical Diaphragm Valve

Typical Ball Valve

Typical Plug Valves

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

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

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

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

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

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

100 75 Linear % Flow 50 Quick Opening Equal Percentage 25 Ideal Flow Characteristics 25 50 75 100 % Valve Travel

Linear Equal Percentage Quick Opening Plug and Seat Flow Characterization

Trim Cage Flow Characterization

Drag Valve Trim

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

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

Packing Gland Follower Valve Stem Braided Ring Graphite Rings Braided Ring Carbon Spacer

Fisher 3582 Positioner Principle of Operation

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

Fisher 3582 Wear Points Roller Wear and Cut Guide & Roller Bearing Guide Wear Roller Wear and Cut 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

Fisher 3570 Positioner Principle of Operation

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

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

Simplified LVDT

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

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

Fisher 546 I/P

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