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Eccentricl PLUG Valve

The eccentric plug valve was first standardized in MSS [Manufacturers Standardization Society] Standard SP-108 in 1991.

Description

The eccentric plug valve was first standardized in MSS [Manufacturers Standardization Society] Standard SP-108 in 1991. As the American Water Works Association (AWWA) expanded into wastewater applications, it published AWWA Standard C517 (in 2005). Both standards are congruent with similar materials of construction and scope.

Eccentric plug valves are provided in sizes ranging from 3–72 inches with a cold working pressure rating of 150 or 175 psig depending on size and have a flow rating of 8 feet per second. The valves are available in short-body and long-body configurations and are seat-tested in the direct pressure direction unless otherwise specified.

Despite published standards, alternate plug valve designs are available that comply. One design has a cylindrical plug face and cylindrical seat (Figure 2). In another design, the port and plug face are round, similar to a half ball valve. Both designs, rectangular and round, can be provided with standard 80% port openings or full 100% port openings and are piggable using flexible urethane pigs. Plug valves also can be provided with -metal-to-metal seats for severe applications such as activated sludge service.

The main construction features of GZP plug valve are following:

1. The plug valve has simple structure, quick switch, small fluid resistance and fast angular stroke operation.

2. Soft sealing and lubricated hard seal are available.

3. Structure form: lifted type, sleeve connection type, inverted type.

4. Unique design can be antistatic, fire safety, safe to use.

5. The medium can flow in two directions, the installation direction is not limited, can be maintained on the pipeline, more convenient to use.

Applications

Water and Wastewater services

-Pump Isolation

-Open / Close, Throttling, Modulating

-Control Balancing

-Lift Stations

-Heavy Solids

-Slurries / Grit Allows larger solids preventing clogging

-Vertical Piping

-Horizontal Piping

Technical data
Design	API 6D, API599
Pressures range	ANSI 150 ~ANSI 900 ,PN10~PN150
Size range	DN50(2") ~DN350 (14")
Body Material	Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel.etc.
Body Material	NACE MR-01-75/NACE MR-01-03 Special Requirements
Face to face	API 6D, ASME B 16.10,EN 558,DIN3202
Fanged RF, FF, RTJ Ends	ASME B16.5
Fanged RF, FF, RTJ Ends	BS 4504,DIN 2543-2545,EN1092
Butt-Weld BW Ends	ASME B16.25 ,DIN 3239,BS 2080, EN 12627
Temperature range	-29°~ 350°C
Design feature
Construction	Lifted type,sleeve type,inverted type,jacketed type
Port	Full bore and Reduced bore
Plug Type	plug type
Stem	Blowout-proof stem
Seat Sealing	metal seat,soft seat,lubricated seal,
Valve Operation	Gear,pneumatic,Hydraulic,Electric actuators.
Valve Operation	By passes,locking devices,extended stem,etc
Fire Safe	API 607, BS 6755,API599
Other design	Anti-static design,automatic pressure relief design, emergency grease injection design, drain valve, anti-corrosion design, anti-sulfur design,etc
Inspection and Test
Visual Inspection	MSS SP-55
Material Inspection	PMI Test----Chemical Analysis
	HB Test---Hardness Test
	UT---Ultrasonic Test
	RT---Radio-graphic Test
	MT---Magnetic Test
	NDT Test Non-destructive
Dimension inspection	According to drawings
Valve Inspection and Test	API 598,DIN 3230,EN 12266,BS 5146

Conclusion

The resilient-seated eccentric plug valve is a unique valve in that it is designed to handle wastewater fluids; when equipped with rubber or glass lining, this valve can also handle abrasive fluids. Because it is a quarter-turn valve, it is easily automated for controlling process flow or pressure.

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Metal To Metal Seat PLUG Valve