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0 / 77 completedIntroduction
Valve bonnet
Valve body
Learning objectives
Stem
Before you proceed to the next section
Trim
Actuator
Plug and seat
Packing
Control valves
Direction of action
Trim arrangement
Before you proceed to the next section
Control valve 3D dismantling
Control valve 2D dismantling
Twoport valves
Balanced single seat
Introduction
Rotary valves
Slide valves Spindle operated
Twoport valves summary
Options
Shutoff tightness
Process examples of threeport valves
Threeport valves
Before you proceed to the next section
Use of flow coefficient Cv for piping and components
Introduction
Valve flow coefficient Cv
Before you proceed to the next section
Equal percentage
Flow characteristics
Linear
Fast opening
Matching the valve characteristic to the process
Example Determining flowrate for different valve lifts
Example A water circulating heating system
Example Constructing the installation curve
Example A boiler water level control system
Example Comparing linear and equal percentage
Before you proceed to the next section
Example The effect of selecting a control valve larger than necessary
Example Temperature control of a steam application
Introduction
Piston actuators
Piston actuators double acting 3D animation
Actuator valve combinations
Diaphragm actuators
Piston actuators single acting Dismantling
What are valve positioners
Motion balance positioners
Effect of differential pressure on the valve lift
Force balance positioners
Example of positioners
Positioners What you should remember
Positioners When should a positioner be fitted
PP positioners
IP positioners
About IP converters
Digital positioners
Before you proceed to the next section
Summary Selecting a pneumatic valve and actuator
Pneumatic actuators
Example 2 Single acting spring return actuators Components Operation
Example 3 Double acting actuators Components Operation
Example 1 Single acting spring return actuators Components Operation
Example 4 Double acting actuators Components Operation
From single acting to double acting actuator
From Fail Close FC to Fail Open FO Scotch Yoke actuators
From Fail Close FC to Fail Open FO Rack and Pinion Actuators
Valve position indication
Before you proceed to the next section
Rack and Pinion vs Scotch Yoke
What type of valves should be installed
Actuators
Control valves