Valves e6q3q

Valves

Mechanical - valves

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Topics ! ! ! !

Regulating Isolating Back flow prevention Pressure Relief

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Typical Actuator & Valve

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Diaphragm Actuator

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Positioner Indicator

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Valve Body

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Basic Valve Construction Plug Stem Studs and Nuts

Packing Rings

Packing Box Valve Bonnet

Packing Spring

Valve Plug Valve Seat

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Valve Body

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Valve Characteristics

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Valve Plugs

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Valve Plugs

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Cage

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Cage too

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Removed Cage

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Reverse & Direct Actuators Return Spring Air Input Diaphragm

Diaphragm

Return Spring

Air Input

Stem Yoke (a) Direct Acting

(b) Reverse Acting

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Reverse & Direct Valves Valve Plug Stem

Valve Plug

Valve Seat

(a) Direct Acting

(b) Reverse Acting

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Failure Mode Actuator

Valve Body

Valve Action

Failure Mode

Direct

Direct

Air to Close

Fail Open

Reverse

Reverse

Air to Close

Fail Open

Direct

Reverse

Air to Open

Fail Closed

Reverse

Direct

Air to Open

Fail Closed

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Piston Actuators

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Piston Actuator

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Diaphragm Valve Operator

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Actuator and Positioner

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Actuator and Positioner

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Actuator Fluids ! ! ! !

Air Oil (mineral and synthetic) Clean Moisture Free

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Isolating Valves ! ! !

Manual Pneumatic Electric Motor

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Manual Valve

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Handwheel

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Gate Valve

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Butterfly Valve

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Ball Valve

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Diaphragm Valve

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Checking Valve Position !

Visual Check ! !

!

Position of handle Indicator on valve

Operational Checks !

Situational Information !

! !

temperatures, levels, pressures

Direction of flow Hearing and touch Mechanical - valves

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Manual Operating Valves ! !

Safety equipment Watch for body mechanics

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Pneumatic Isolating Valves

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2 Way Solenoid Valve Cover Nut Conduit Opening

Stop Washer

Coil Plunger Centering Washer Valve Stem Valve Body Valve Disc

Valve Seat

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3 Way Solenoid Valve Solenoid Valve E Air Supply 100 kPa(g) D Vent to Atmosphere A/O

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Electric Valve Operator

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Electric Actuator

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Valve Limit Switches

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Electric Actuator

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Valve Limit Switches

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Limitorque Valve Actuator

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Limitorque Valve Guts

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Motor Gear Drive

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Worm Gear

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Limit Switch

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Torque Switch

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Electric Valve Operator Switches ! ! !

Limit Torque Speed

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Manual Operation !

Hand wheel is engaged with a handle !

!

Disengages when motor starts

Valve can be taken off seat by slack in gearing

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Backseating ! !

Some valves Seat at top of valve to remove pressure from packing

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Intergate Valve

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Backflow Prevention

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Check Valves

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Check Valve Body

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Check Valve Gate Open

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Check Valve Gate Closed

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Safety --- Relief !

Relief ! !

!

Safety ! !

!

Lift proportional to overpressure Liquid service Open quickly and completely on overpressure Generally for gases

Safety Relief !

Good for liquid and gas service

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Safety/Relief Valves ! ! ! ! ! ! !

Lifting pressure Capacity Popping Blowdown Chatter Flutter Simmering

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Safety or Relief Valve

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Safety or Relief Valve

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Valve Gags ! !

!

Require TSSA approval ASME Section III requires CNSC approval No-approval required for testing

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Steam Traps

Mechanical

Thermodynamic Thermostatic Mechanical - valves

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Mechanical Steam Trap

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Thermodynamic Steam Trap

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Again

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Trap Operation ! ! !

Visual Sound Temperature !

Infrared measuring

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Trap Open

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