Double Eccentric Rotary Plug Control Valve Manufacturer - THINKTANK

What is an eccentric rotary plug valve?

The eccentric rotary plug control valve has a one-piece body design and connects by flanged(ASME Class150 ~ 300, PN10 ~64) or wafer type(ASME Class150 ~ 300).

An eccentric plug valve is a type of rotary control valve which has a shaped plug. The plug doesn’t touch with the valve seat until within a few angles of the close position. Due to the plug-shaped contacts or ”cams” into the seat, its surfaces will dynamically align to get to shut off. This is the valve we called eccentric plug valves.

This valve with a plug-shaped component that follows an eccentric part as it rotates. 

The plug will not touch the seat until it turns within a few degrees of the cutoff position. Sometimes we call the plug a cam, when it is into the seat, the sealing surfaces dynamically align to achieve cutoff.

eccentric plug rotary valves

The most common application for eccentric rotary plug control valves is for the medium with slurries, grit, or solids. They have high performance of control accuracy and wide rangeability with all the inherent benefits of rotary control valves. 

Basically, the eccentric rotary control valves will be complete with a pneumatic actuator, digital/smart positioner, and air filter regulator for precise flow control.

eccentric plug control valves1
eccentric plug valve6
eccentric plug valve7

How does a pneumatic eccentric plug control valve work?

At the steam, dirty corrosive liquid or gas, erosive, abrasive slurries processes, we can see always use eccentric plug control valves there. 

The eccentric rotary control valve is a straight-through valve body structure with low fluid resistance. The center of rotation of the valve core is not concentric with the rotation axis, which can reduce the wear of the valve seat and extend the service life. There is a guide wing at the rear of the valve core, It is conducive to stable fluid flow and has excellent stability. At the same time, it also has the advantages of a large flow rate and wide adjustable range, which is especially suitable for the control of process systems containing slurry.

To ensure a large adjustable ratio and reliability, and reduce meters, the eccentric rotary valve core can be used to contain acidic gas or liquid, and its structure and materials comply with the National Society of Anti-Corrosion Engineers standard NACE MR0175—2002.

eccentric plug control valves2
eccentric plug valve9
eccentric plug valve8

What are the characteristics of eccentric plug rotary valve

The plug and stem of the eccentric rotary valve only make a rotary motion, with compact structure, lightweight, simple flow path, low resistance, large flow coefficient, small leakage, good stability, wide adjustment range and operating temperature range Wide and other advantages. When the eccentric rotary valve works, due to only the valve stem makes a partial rotation, the friction between the valve stem and the packing is small, so the packing has a long service life. The extension bonnet of the eccentric rotary valve is integrated with the valve body,  It has a simple structure and good heat dissipation effect. 

What difference between globe control valves and eccentric plug valves?
Globe Control Valve VS. Eccentric Plug Valve

At the process loop of indutry, commonly to use control valves to modulating fluid or gas flow capacity or downstream pressure, it can be sliding-type globe control valve, also eccentric plug valve. But what difference between them?

Globe type control valve is a linear motion control valve, and the eccentric plug control valve is a rotary type control valve. 

The eccentric plug control valve is designed with integrated excellent characteristics of globe type control valve and ball/butterfly valves. For example, the globe valve has high control performance, and ball/butterfly valves have high CV value(high flow capacity value), and the eccentric plug control valves combine both features, which with much higher rangeability. 

Basic design features:

  • Rotary valve with a longer life service time of packing
  • No redirection along the flow path
  • Trim moves completely out of the flow path
  • Double eccentric design

Where are eccentric plug valves used?

Eccentric plug valves are very common control valves in the process loop, with a compact structure, high accuracy controlling, and cost-effective performance. 

The eccentric rotary valve is suitable for the modulating of large flow capacity, high viscosity, and granular medium.

Due to the great scissor force and self-cleaning ability between the valve core and the valve seat, it is especially suitable for flow control of slurry, fiber, or solid particles, which are used in mining, petroleum refining, power, and pulp and paper industries.

What is the other name for eccentric plug valves?

Some people just wondering which one is exactly eccentric plug valves, with different designs of trim and plug, there are other names called V-port ball valve, V notch ball valve, Segment ball valve, Eccentric rotary valve, Cammed segmented ball valve.

Main Technical Parameters

  • Size: DN25 to DN100
  • Pressure Rating: 150LB to 300LB, PN16 to pN64
  • Initial deviation: ±3%
  • Dead zone: 1%
  • Rated travel deviation:50°±3°
  • Inherently adjustable ratio: 100:1
  • Leakage level:
    Metal Seat: ANSI VI;
    Soft Seat: ANSI VI;
  • Pressure recovery coefficient FL:
    Full Bore: Flow to Open: 0.85; Flow to Close: 0.68;
    Reducing Bore: Flow to Open: 0.88; Flow to Close: 0.70
屏幕快照 2021 08 15 15.00.37

Name

Material

Body

A216 Gr. WCB(ZG25), A216 Cr. WCC,  CF8(ZG1Cr18Ni9Ti), CF8M(ZG0Cr18Ni12Mo2Ti), A352LC3   A352LC3

Trim

CF8(ZG1Cr18Ni9Ti), CF8M(ZG0Cr18Ni12Mo2Ti), CF8M+No.6

Seat

304、316、316+No.6、(316+PTFE)

Stem

316(0Cr18Ni12Mo2Ti), 17-4PH

Cage

9Cr18, 316+No.6

Packing

PTFERPTFEGraphite

Characteristic Flow Curve of Plug Control Valves

characteristic flow curve of plug control valves

DN (mm)

Cv

Air to Close Flow to Open

Air to Open Flow to Close

Air to Open-Flow to Close Air to Close-Flow to Open

Supply Air

0.14

0.18

0.21

0.25

0.28

0.32

25

14

8.4

5.6

2.8

7.03

10.1

10.1

10.1

7.03

10.1

10.1

10.1

7.03

10.1

10.1

10.1

– – – –

– – – –

– – – –

– – – –

– – – –

40

30

18

12

6

3.45

5.20

7.03

7.03

4.71

7.03

9.84

9.84

3.02

4.50

6.33

6.33

5.62

9.67

10.1

10.1

– – – –

– – – –

– – – –

– – – –

50

50

30

20

10

1.90

2.88

3.80

3.80

2.53

3.94

5.20

5.20

1.62

2.46

3.30

3.30

3.51

5.34

7.03

7.03

4.22

7.03

7.03

7.03

– – – –

– – – –

– – – –

80

135

81

54

1.40

2.25

3.23

1.97

2.95

4.50

1.27

1.90

2.81

2.67

4.08

6.12

4.22

6.54

7.03

– – –

– – –

– – –

100

230

138

92

0.70

1.12

1.62

0.98

1.55

2.18

0.63

0.98

1.40

1.40

2.10

3.02

2.25

3.45

4.92

3.10

4.71

6.82

3.94

6.05

7.03

4.22

7.03

7.03

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