PLUG VALVES DEFINITION BASIC AND TUTORIALS


A plug valve is a quarter-turn valve that controls flow by means of a cylindrical or tapered plug with a hole through the center, which can be positioned from open to closed by a 90° turn.



Recommended
● For fully open or fully closed service
● For frequent operation
● For low pressure drop across the valve
● For minimum resistance to flow
● For minimum amount of fluid trapped in line


Applications
● General service, blow-down service, liquids, gases, steam,
corrosives, abrasive media, slurries

Advantages
● High capacity
● Low cost
● Tight shutoff
● Quick operation

Disadvantages
● High torque for actuation
● Seat wear
● Cavitation at low pressure drop


Variations
● Lubricated, nonlubricated, multiport

Materials
● Bronze, iron, ductile iron, carbon steel, low-alloy steel, stainless steel, Monel, nickel alloys,
PVC plastic, plastic-lined

Special Installation and Maintenance Instructions
● Allow space for operation of handle on wrench-operated valves.
● For lubricated plug valves, lubricate before putting into service.
● For lubricated plug valves, lubricate on regular schedule.

Ordering Specifications
● Body material
● Plug material
● Temperature rating
● Pressure rating
● Port arrangement, if multiport valve
● Lubricant, if lubricated valve



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