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CHAPTER 6: INDUSTRIAL VALVES - Coggle Diagram
CHAPTER 6: INDUSTRIAL VALVES
INTRODUCTION
Valve
: A mechanical device that is used in industrial piping to control the flow of fluids.
Fluid
: Any substance that can flow from one area to another when it subjected to a normal and shear stress. Gases and liquids are both considered fluids.
On-Off Service
: Valves that only operate in the fully open or fully closed positions are said to provide on-off service.
Throttling Service
: Valves that control flow by partially restricting the passage of the fluid provide in what is called throttling service.
Pressure Drop
: The loss of energy that occurs when a fluid encounters resistance passing through a valve
TYPE OF VALVES
On-Off Service
Plug Valve
-Made out of a solid piece that has an opening through it.
The valve is positioned by turning a lever
Quick opening
Ball Valve
Similar in design and operation to a plug valve, but in a shape of a ball.
Quick opening
Not designed for excessive temperature
Gate Valve
Positions:
Closed: Gate is placed across the pipe’s opening.
Open: Gate is raised completely out of the flow line
Materials:
-Stainless steel gate valve
Alloy gate valve
-Bronze gate valve
-Brass gate valve
-Cast iron gate valve
Throttling Service
Butterfly valve
Commonly used for throttling and on/off services
Flow rate is adjusted by changing the angle of the disc
Quick opening
Operated at low temperature and low pressure.
Check Valve
Check Valve Design
Swing Check Valve
Lift Check Valve
Ball Check Valve
Globe Valve
The flow path changes in direction.
Preferred to use for services that require frequent valve operation.
Materials:
Stainless steel globe valve
Alloy globe valve
Bronze globe valve
Brass globe valve
Cast iron globe valve