Lift Plug Valves

What is a plug valve?

Lift plug valve is a new type of plug valve which develops rapidly in recent years. It adopts the valve operation mode of lifting first and then opening and closing, which greatly reduces the opening and closing torque of the lift plug valve. Different from the traditional lift plug valve, the rectangular reducing channel is adopted for the valve. The valve usually adopts the circular channel, which greatly reduces the flow resistance of the lift plug valve. The metal hard seal lifting lift plug valve has the advantages of both ball valve and gate valve, It can be used in high temperature and high pressure conditions, and greatly expand the use range of lift plug valve.


Features of lift plug valve

  • 1. When the lifting lift plug valve with metal hard seal is opened and closed, the cock is lifted first to separate the plug from the sealing surface of the valve seat, and then the plug is rotated 90 ° to open or close the valve. Since the cock and the valve seat are separated in the process of opening and closing, the valve is easy to open and close, and the sealing surface is not easy to scratch in the process of opening or closing, so the service life of the valve is long.
  • 2. lift plug valve whether in the open state or closed state, the sealing surface is protected from medium erosion, tight and reliable seal.
  • 3. The common lift plug valve adopts rectangular flow channel, and the area of flow passage is reduced, which leads to a large loss of fluid resistance, while the metal hard seal lifting lift plug valve adopts the circular channel with the same cross-sectional area as the pipeline, so the fluid resistance is the minimum.
  • 4. Compared with the gate valve, the height size of the valve is greatly reduced, and the fluid resistance is greatly reduced compared with the stop valve.
  • 5. Compared with the common lift plug valve, the metal hard seal lifting lift plug valve is suitable for a wider range of pressure and temperature.
  • 6. The valve seat sealing surfaces on both sides of the metal hard seal lifting lift plug valve can be sealed. The installation and use of the valve are not limited by the flow direction of the medium.
  • 7. When the metal hard seal lifting lift plug valve is closed, the valve seat sealing surface can be pressurized by hand wheel and valve stem. By increasing the sealing specific pressure, the lift plug valve can have better sealing performance.
  • 8. The sealing surface of the valve seat is convex, which is convenient for cleaning the sealing surface, and it is not easy to deposit crystal medium or solid particles on the sealing surface.

Performance parameters of lifting plug valve

Main performance parameters of metal hard seal lifting plug valve

Design and manufacturing standards Structure length Piping flange Pressure temperature class Test and inspection Applicable temperature Applicable media
API 599、

API 6D、

Q/ZCD01-2000

ANSI B16.10、

GB/T15188.1、

Q/ZCD 01-2000

JB/T74~90、

GB/T9112~9124、

HG 20592~20635、

ANSI B16.5、

SH3406

JB/T74、

GB/T9124、

HG 20604~20625、

ANSI B16.34、

SH 3406

API598、

JB/T9092

425℃ Water, steam, oil, etc

Product parts and materials

Metal hard seal lifting plug valve parts and materials

Valve body WCB CF8 CF3 CF8M CF3M
Cock CF8 CF8 CF3 CF8M CF3M
Valve stem and internals 2Cr13 0Cr18Ni9 (304) 00Cr19Ni10 (304L) 0Cr17Ni12Mo2 (316) 00Cr17Ni14Mo2 (316L)
Stuffing Flexible graphite

Product outline and structural dimensions

Main outline and structural dimensions of class150 (PN20) metal hard seal lifting plug valve (mm)

DN NPS L d D D1 D2 b z×Φd f L0 H D0 Weight/kg
(mm) (in) RF RJ Surfacing
40 11/2 222 235 222 38 127 98.5 73 14.5 4×Φ15 1.6 200 210 200 10
50 2 267 280 267 50 152 120.5 92 16 4×Φ19 1.6 250 260 200 13
65 21/2 298 311 305 64 178 139.5 105 17.5 4×Φ19 1.6 250 300 200 17
80 3 343 356 330 76 190 152.5 127 19.5 4×Φ19 1.6 300 330 250 23
100 4 432 445 356 100 229 190.5 157 24 8×Φ19 1.6 300 350 300 33
125 5 508 521 381 125 254 216 186 24 8×Φ22 1.6 330 370 300 62
150 6 533 546 394 150 279 241.5 216 25.5 8×Φ22 1.6 330 440 350 95
200 8 635 648 457 201 343 298.5 270 29 8×Φ22 1.6 350 550 350 160
250 10 787 800 533 252 406 362 324 30.5 12×Φ25 1.6 400 650 400 278
300 12 914 927 610 303 483 432 381 32 12×Φ25 1.6 450 750 400 430
350 14 978 991 686 337 533 476 413 35 12×Φ29 1.6 500 800 450 620

Main outline and structural dimensions of class300 (pn50) metal hard seal lifting plug valve (mm)

DN NPS L d D D1 D2 b z×Φd f L0 H D0 Weight/kg
(mm) (in) RF RJ Surfacing
40 11/2 241 254 241 38 156 114.5 73 21 4×Φ22 1.6 250 210 250 14
50 2 293 299 267 50 165 127.0 92 22.5 8×Φ19 1.6 300 260 250 20
65 21/2 330 346 305 64 190 149.0 105 25.5 8×Φ22 1.6 350 300 300 25
80 3 387 403 330 76 210 168.5 127 29 8×Φ22 1.6 350 330 300 35
100 4 457 473 356 100 254 200 157 32 8×Φ22 1.6 350 350 350 52
125 5 508 524 381 125 279 235 186 35 8×Φ22 1.6 350 370 350 85
150 6 559 575 457 150 318 270 216 37 12×Φ22 1.6 400 440 400 130
200 8 686 702 521 201 381 330 270 41.5 12×Φ25 1.6 450 550 450 210
250 10 826 842 559 252 445 387.5 324 48 16×Φ29 1.6 500 650 500 340
300 12 965 981 635 303 521 451 381 51 16×Φ32 1.6 550 750 550 510
350 14 991 1007 762 337 584 514.5 413 54 20×Φ32 1.6 600 800 600 750

Main outline and structural dimensions of CLASS600 (pn110) metal hard seal lifting plug valve (mm)

DN NPS L d D D1 D2 b z×Φd f L0 H D0 Weight/kg
(mm) (in) RF RJ Surfacing
40 11/2 318 318 241 38 156 114.5 73 22.5 4×Φ22 6.4 250 230 250 20
50 2 330 333 292 50 165 127 92 25.5 8×Φ19 6.4 300 280 250 28
65 21/2 381 384 330 64 190 149 105 29 8×Φ22 6.4 350 320 300 35
80 3 444 447 356 76 210 168.5 127 32 8×Φ22 6.4 350 350 300 45
100 4 508 511 432 100 273 216 157 38.5 8×Φ25 6.4 400 380 350 68
125 5 559 562 508 125 330 266.5 186 44.5 8×Φ29 6.4 400 400 400 100
150 6 660 663 559 150 356 292 216 48 12×Φ29 6.4 450 470 450 155
200 8 794 797 660 201 419 349 270 55.5 12×Φ32 6.4 500 580 500 255
250 10 940 943 787 252 508 432 324 63.5 16×Φ35 6.4 550 680 550 390
300 12 1067 1070 838 303 559 489 381 67 20×Φ35 6.4 600 780 600 570

Main outline and structural dimensions of class900 (pn150) metal hard seal lifting plug valve (mm)

DN NPS L d D D1 D2 b z×Φd f L0 H D0 Weight/kg
(mm) (in) RF RJ Surfacing
40 11/2 356 356 305 38 178 124 73 32 4×Φ29 6.4 300 250 300 28
50 2 381 384 368 50 246 165 92 38.5 8×Φ26 6.4 350 300 300 39
65 21/2 432 435 419 64 244 190.5 105 41.5 8×Φ29 6.4 400 340 300 49
80 3 470 473 381 76 241 190.5 127 38.5 8×Φ26 6.4 450 370 350 63
100 4 559 562 457 100 292 235 157 44.5 8×Φ32 6.4 450 400 400 95
125 5 610 613 559 125 349 279.5 186 51 8×Φ35 6.4 500 430 450 140
150 6 737 740 610 150 381 317.5 216 56 12×Φ32 6.4 550 500 500 215
200 8 813 816 737 201 470 393.5 270 63.5 12×Φ39 6.4 600 520 550 350
250 10 965 968 838 252 545 470 324 70 16×Φ39 6.4 700 620 600 540
300 12 1118 1121 965 303 610 533.5 381 79.5 20×Φ39 6.4 700 820 650 790

Note:

  • ① RF represents raised face flange; RJ refers to the flange of the ring connecting surface.
  • ② Flange size shall be in accordance with ANSI B16.5 standard. According to the user’s requirements, the flange size can also be designed and manufactured according to GB / T 9112 ~ 9124, Hg 20592 ~ 20635 and sh3406. 
  • ③ The flange in class150 (PN20) ~ class300 (pn50) plug valve generally adopts bolt and nut connection structure; The flange of CLASS600 (pn110) ~ 900 (pn150) plug valve generally adopts pressure self tightening sealing structure.

Precautions for installation of lift plug valve

When installing the lift plug valve, in order to prevent damage to the lift plug valve and ensure the full performance of the lift plug valve, pay attention to the following four points:

  • 1. Make sure the valve is open. Heat the pipe first. Transfer as much heat as possible from the pipe to the lift plug valve. Avoid prolonging the heating time of the lift plug valve itself.
  • 2. Use gauze or wire brush to remove the pipe and cutting parts to make the metal surface shine. Steel wool is not recommended.
  • 3. First cut the pipe along the vertical direction, trim and remove burrs, and measure the pipe diameter.
  • 4. Apply flux to the outside of the pipe and the inside of the welding cover, and the flux completely covers the welding surface. Please use flux sparingly.

China lift plug valve manufacturer www.sfutube.com supplies lift plug valve for industrial use, in kinds of materials such as carbon steel, stainless steel, alloy steel, etc.

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China Valves Manufacturer www.sfutube.com offers lift plug valve.