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Kikventiler/Plug Valve

Plug Valve

A plug valve is a quarter-turn rotational motion valve that use a tapered or
cylindrical plug to stop or start flow.
In the open position, the plug-passage is in one line with the inlet and outlet
ports of the valve body.
If the plug 90° is rotated from the open position, the solid part of the plug blocks
the port and stops flow.
Plug valves are similar to ball valves in operation.
Normaly wrench operated.

Advantages of using plug valves:
• Quick quarter turn on-off operation
• Minimal resistance to flow
• Smaller in size than most other valves

Disadvantages of plug valves:
• Requires a large force to actuate, due to high friction.
• NPS 4 and larger valves requires the use of an actuator.
• Reduced port, due to tapered plug.

Types of Plug Valves and Sealing
Plug valves are available in a nonlubricated or lubricated design and with
several styles of port openings.
Different lubricants can be used.
The port in the tapered plug is generally rectangular, but they are also
available with round ports and diamond ports.
Plug valves are also available with cylindrical plugs.
The cylindrical plugs ensure greater port openings equal to or larger than
the pipe flow area.
Venturi Pattern, regular Full Bore Pattern, Short Pattern, regular Pattern and
regular Round Full Bore pattern.

• Lubricated plug valves are provided with a cavity in the middle along there axis.
This cavity is closed at the bottom and fitted with a sealant-injection fitting at
the top. The sealant is injected into the cavity, and a check valve below the
injection fitting prevents the sealant from flowing in the reverse direction.
The lubricant in effect becomes a structural part of the valve, as it provides
aflexible and renewable seal.

• Nonlubricated Plug Valves contain an elastomeric body liner or a sleeve,
which is installed in the body cavity.
The tapered and polished plug acts like a wedge and presses the sleeve
against the body.
Thus, the nonmetallic sleeve reduces the friction between the plug and the body.

Plug Valve Disk
• Rectangular port plugs are the most common port shape,
The rectangular port represents 70 to 100 percent of the Internal pipe area.
• Round port plugs have a round opening through the plug.
If the port opening is the same size or larger than the inside diameter of the pipe,
a full port is meant. If the opening Is smaller than the inside diameter of the pipe,
a standard round port is meant.
• Diamond port plug has a diamond-shaped port through the plug and they
are venturi restricted flow types.
This design is suitable for throttling service.
Other ports: Straightway round, Regulatin, Threeway round L-port,
Threeway round T-port, Fourway round straightway,
Threeway rectangular L-port & Threeway rectangular T-port.

Typical Applications of Plug Valves
A plug valve can be used in many different fluid services and they perform
well in slurry applications.
The following are some typical applications of plug valves:
• Air, gaseous, and vapor services
• Natural gas piping systems
• Oil piping systems

Available in sizes: ½” to 12” in ANSI Class 150LB to 2500LB
Design: BS 5353, ANSI B16.34, API 6A, API 6D, API 598, API 599,
NACE MR 01-75, API 607, API 6FA,, BS 6755, ISO 10497, ANSI B16.10,
ANSI B16.5, MSS SP-54, MSS SP-55, MSS SP-61
Ends Connections: NPTF, SW, BW, RF, RTJ & Clamps
Materials: WCB, WCC, LCB, LCC, CF3(M), CF8(M), CF8C, CN7M,
Lead Bronze 80/10/10.
Trims: Stainless Steel, ENP, 17.4PH with Seats PTFE,
RPTFE, Nylon, PFA, UHMWPE and metal seated.

Special materials also available:
Duplex, Super Duplex, Monel 400, Nickel 200
Hastelloy, Titanium, Inconel, Incoloy, 6MO & Zirconium

Modifications include: Gearboxes, Actuation, Stem &
Cryogenic Extensions & Pipe Pups

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