Plug Valves 
Function:
Plug Valve is the oldest known kind of valve. It is a commend assumption that the plug in the plug valve is taper (conic) . The fact is that there is a huge verity of the inside construction of a plug valve.
Operation:
- The plug valve is a 90 deg (quarter turn) operated valve.
- The main purpose of a plug valve is isolation, and it will than either be fully open or fully closed
- The secondary function of the valve is regulation which is achived by tapering the valve bore. This will reduce the aperture of the plug.
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Range of application:
• Oil production
• Water injection
• Mud systems.
• Shut down valve on production
• Water injection and test manifold
• Between valve tree and separator.
• Change-over valve between filters.
• Meetering stations
Options
- Cylindrical
- Cylindrical without seats (integrated sets in the valve body)
- Full bore “through conduit”
- Venturi with reduced bore
Maintenance:
- As a rule plug valves are expected to be maintenance free, however for some valves maintenance is highly required to secure operation and avoid damage.