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Manual Vacuum Isolated Wedge Gate Valve

MFG: Shanghai Fengqi Industry Development Co., Ltd.
Eml: sales@fengqi.sh.cn

Tel: 0086 (021) 3652 8716
Mob: (0086) 138 1635 6498

product drawing

Manual vacuum isolated wedge gate valves
Manual vacuum isolated wedge gate valves

The connection types are flange and welding connection. And drive modes are manual and electric. The valve is used as a hoist device in the pipeline of the medium of water,steam, air, which the working temperature ≤425℃ and ≤550℃. It is especially suitable for thermal power plant steam turbine condensate and vacuum system, has a vacuum isolated sealing effect.

The structural features

1、It designs the vacuum sealing structural packing room, allows the system isolated from the atmosphere, and has a good environmental performance.
2、Exquisite Selection, according to the domestic and international standards, and the materials has the overall high quality.
3、The match of sealing is advanced and reasonable, it also improves sealing performance, and has a long service life.
4、The sealing of hoist part uses parallel disc two-way flexible sealing. It has small friction, open and close easily, easy to maintain, sealing reliable, and excellent performance.
5、After quenched and tempered and surface nitriding treatment, the stem has a good corrosion resistance, scratch resistance and abrasion resistance.
6、Flange Gasket uses composite materials, has expansion coefficient and gas-tight performance, ensures system isolated from the atmosphere reliably.

Dimensions & constructral diagram

Manual vacuum isolated wedge gate valve constructral diagram(pic1)
Manual vacuum isolated wedge gate valve constructral diagram(pic1)
Manual vacuum isolated wedge gate valve constructral diagram(pic2)
Manual vacuum isolated wedge gate valve constructral diagram(pic2)

Pressure test

Nominal pressure PN/MPa pressure test MPa
Shell intensity test Back seal test Seat test
1.0 1.5 1.1 1.1
1.6 2.4 1.8 1.8
2.5 3.8 2.8 2.8
4.0 6.O 4.4 4.4
6.4 8.6 7.O 7.0
1O.O 15.O 11.O 11.O

The application scope

Product type Applicable medium Applicable temperature
NKZ41H NKZ44H NKZ944H-C tyoe NKZ941H Water,Steam,Air ≤425
NKZ41H(Y) NKZ44H(Y)-I type NKZ944H(Y)-I type NKZ941H(Y) Water,Steam,Air ≤550

The materials of main parts

Part name Body Bonnet Stem disc Sealing face stem nut Parking Fastener
NKZ44H NKZ41H-C type NKZ944H-C type NKZ941H WCB 2Crl3 25 H:alloy steel Al-bronze Expanding compound graphite High-grade carbon steel
NKZ44 NKZ41Y-I type NKZ944-I type NKZ941 Cr.Mo steel 20CrlMo1VA 38CrMoAlA Cr.Mo steel Y:carbide alloy Cr.Mo steel

The main dimensions and weight

Nominal diameter Nominal pressure Main extemal and connecting dimensions Valve weight (kg) Additional flange’s dimensions (mm)
L H D D1 D2 b f z-d W h D0 Dn
50 1.0 250 345 160 125 1OO 16 3 4-18 250 28 45 49 58
65 270 395 180 145 120 18 3 4-18 250 40 48 64 75
80 280 425 195 160 135 20 3 4-18 300 55 50 78 97
100 300 51O 215 180 155 20 3 8-18 300 72 52 96 110
125 325 570 245 21O 185 22 3 8-18 350 106 60 120 136
150 350 725 280 240 21O 24 3 8-18 350 146 60 145 163
200 400 820 335 295 265 26 3 8-18 400 220 62 202 223
250 450 890 390 350 320 28 3 12-23 400 315 62 225 278
300 500 1070 440 400 368 28 3 12-23 450 398 65 303 330
350 550 1320 500 460 428 30 4 16-23 550 530 65 351 382
400 600 1450 565 515 482 32 4 16-25 550 690 65 398 432
450 650 1560 615 565 532 32 4 20-25 600 870 70 460 485
500 700 1720 670 620 585 34 4 20-25 650 1080 78 500 535
600 800 1880 780 725 685 36 5 20-30 700 1350 90 600 636
700 900 2085 895 840 800 40 5 24-30 750 1950 90 690 726
800 1OOO 2590 101O 950 905 44 5 24-34 800 2500 106 790 826
50 1.6 250 345 160 125 1OO 16 3 4-18 250 28 48 49 58
65   270 395 180 145 120 18 3 4-18 250 40 50 64 75
80 280 425 195 160 135 20 3 8-18 300 58 52 78 91
100 300 51O 215 180 155 20 3 8-18 300 75 52 96 110
125 325 570 245 21O 185 22 3 8-18 350 110 60 120 136
150 350 725 280 240 21O 24 3 8-23 350 150 60 145 163
200 400 820 335 295 265 26 3 12-23 400 223 62 201 223
250 450 890 405 355 320 30 3 12-25 450 326 68 253 278
300 500 1070 460 41O 375 30 3 12-25 550 432 70 303 330
350 550 1320 520 470 435 34 4 16-25 600 572 78 351 382
400 600 1450 580 525 485 36 4 16-30 650 740 90 398 432
450 650 1560 640 585 545 40 4 20-30 700 955 95 450 485
500 700 1720 705 650 608 44 4 20-34 750 1195 98 500 535
600 800 1880 840 770 718 48 5 20-41 800 1455 105 600 636
700 900 2085 g1O 840 788 50 5 24-41 850 211O 11O 690 726
800 1OOO 2590 1020 950 898 52 5 24-41 950 2630 115 790 826

The main dimensions and weight

Nominal diameter Nominal pressure Main external and connecting dimensions (mm ) Valve weight (kg) Additional flange’s dimensions (mm)
L H D D1 D2 b f Z-d W h DO Dn
50 2.5 250 345 160 125 100 20 3 4-18 250 30 48 49 64
65 270 395 180 145 120 22 3 8-18 250 43 52 66 82
80 280 425 195 160 135 22 3 8-18 300 60 55 78 95
1OO 300 510 230 190 160 24 3 8-23 300 79 62 100 117
125 325 570 270 220 188 28 3 8-25 350 114 68 125 144
150 350 725 300 250 218 30 3 8-25 350 157 72 151 172
200 400 820 360 310 278 34 3 12-25 400 243 60 201 223
250 450 890 425 370 332 36 3 12-30 450 345 85 253 278
300 500 1070 483 430 390 40 4 16-30 550 455 92 303 330
350 550 1320 550 4g0 448 44 4 16-34 650 615 98 351 382
400   1450 610 550 505 48 4 16-34 700 7g4 115 398 432
450 650 1560 660 600 555 50 4 20-34 750 1018 115 450 483
500 700 1720 730 660 61O 52 4 20-41 800 1250 120 498 535
600 800 1880 840 770 718 56 5 20-41 850 1528 130 598 636
700 900 2085 955 875 815 60 5 24-48 900 2265 140 688 726
800 1000 2590 1070 990 930 64 5 24-48 1000 2847 150 788 826
Nominal diameter Nominal pressure Main external and connecting dimensions Valve weight Additional flange’s dimensions (mm)
L H D D1 D2 b f D6 f2 z-d W h DO Dn
50 4.0 250 345 160 125 100 20 3 88 4 4-18 300 35 48 48 64
65 270 395 180 145 120 22 3 11O 4 8-18 300 49 52 66 82
80 280 425 195 160 135 22 3 121 4 8-18 350 65 58 78 95
100 300 510 230 190 160 24 3 150 4.5 8-23 350 87 68 100 117
125 325 570 270 220 188 28 3 176 4.5 8-25 400 124 68 125 144
150 350 725 300 250 218 30 3 204 4.5 8-25 400 172 72 151 172
200 400 820 375 320 282 38 3 260 4.5 12-30 450 275 88 19g 223
250 450 890 445 385 345 42 3 313 4.5 12-34 550 392 102 251 278
300 500 1070 51O 450 408 46 4 364 4.5 16-34 650 515 116 301 330
350 550 1320 570 510 465 52 4 422 5 16-34 750 684 120 34g 382
400 600 1450 655 585 535 58 4 474 5 16-41 850 902 142 396 432
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