Plug Valves - An Overview

A plug valve is an on-off or a shut-off valve.  A plug valve is a quarter turn valve and is used where quick and frequent operation is essential.

Conventional plug valves have relatively poor throttling characteristics.  Special trims are required when used for throttling. Plug valve can have the following port patterns :

• Regular Pattern
• Venturi Pattern
• Short Pattern

Regular pattern valves have full area seat ports. Venturi pattern valves have reduced area seat ports. Operating torques are lower for venturi pattern plug valves.

Plug valves are of following types

• Lubricated plug
• Non lubricated plug

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