NKZ 系列真空隔离并联双盘闸阀
NKZ系列真空隔绝式并行双盘闸阀专为最高温度达425°C或550°C的水、蒸汽和空气管道设计。该阀门采用真空密封填料、并行双盘密封结构以及法兰或焊接连接方式，特别适用于火电厂的汽轮机冷凝器及真空负压系统。
描述
NKZ 系列真空隔离并联双盘闸阀
The NKZ series vacuum isolation parallel double disc gate valve is designed for
water, steam and air pipelines operating at temperatures up to 425°C or 550°C.
It is available with flanged or welded connections and can be operated manually
or by an electric actuator.
The valve is especially suitable for turbine condenser systems and vacuum
negative-pressure systems in thermal power plants. Its vacuum sealing structure
isolates the pipeline system from the atmosphere and provides reliable vacuum
isolation performance.
主要特点
- Available with flanged or welded connections.
- Manual and electric actuation options.
- Vacuum sealing packing chamber isolates the system from the atmosphere.
- Excellent environmental sealing performance.
- Parallel double disc gate provides bidirectional elastic sealing.
- Low friction and smooth opening and closing operation.
- Reliable sealing performance and convenient maintenance.
- Stem is heat-treated and surface-nitrided for corrosion and wear resistance.
- Composite flange gasket provides excellent air-tightness.
- Suitable for turbine condenser and vacuum negative-pressure systems.
压力测试数据
| Nominal Pressure PN (MPa) | Shell Strength Test (MPa) | Back Seat Test (MPa) | Seat Test (MPa) |
|---|---|---|---|
| 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 | 6.0 | 4.4 | 4.4 |
| 6.4 | 8.6 | 7.0 | 7.0 |
| 10.0 | 15.0 | 11.0 | 11.0 |
Applicable Service Range
| 产品类型 | 适用介质 | Maximum Temperature |
|---|---|---|
| NKZ41H, NKZ44H, NKZ944H-C, NKZ941H | Water, steam and air | ≤425°C |
| NKZ41H(Y), NKZ44H(Y)-I, NKZ944H(Y)-I, NKZ941H(Y) | Water, steam and air | ≤550°C |
Materials for Main Parts
| 型号系列 | Body and Bonnet | Stem | Gate | Sealing Face | Stem Nut | 包装 | Fasteners |
|---|---|---|---|---|---|---|---|
| NKZ44H / NKZ41H-C / NKZ944H-C / NKZ941H | WCB | 2Cr13 | 25 | Alloy steel | Aluminium bronze | Expanding composite graphite | High-grade carbon steel |
| NKZ44 / NKZ41Y-I / NKZ944-I / NKZ941 | Chromium-molybdenum steel | 20CrMo1VA / 38CrMoAlA | Chromium-molybdenum steel | Hard alloy | Chromium-molybdenum steel | Expanding composite graphite | Chromium-molybdenum steel |
典型应用
- Thermal power plant turbine condenser systems
- Vacuum negative-pressure pipelines
- Steam pipelines
- Water supply systems
- Compressed air and industrial air systems
- Vacuum isolation and atmospheric isolation service
Main Dimensions and Weight
| DN (mm) | PN (MPa) | Main External and Connecting Dimensions (mm) | Valve Weight (kg) | Additional Flange Dimensions (mm) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | H | D | D1 | D2 | b | f | z-d | W | h | D0 | Dn | |||
| 50 | 1.0 | 250 | 345 | 160 | 125 | 100 | 16 | 3 | 4-18 | 250 | 28 | 45 | 49 | 58 |
| 65 | 1.0 | 270 | 395 | 180 | 145 | 120 | 18 | 3 | 4-18 | 250 | 40 | 48 | 64 | 75 |
| 80 | 1.0 | 280 | 425 | 195 | 160 | 135 | 20 | 3 | 4-18 | 300 | 55 | 50 | 78 | 97 |
| 100 | 1.0 | 300 | 510 | 215 | 180 | 155 | 20 | 3 | 8-18 | 300 | 72 | 52 | 96 | 110 |
| 125 | 1.0 | 325 | 570 | 245 | 210 | 185 | 22 | 3 | 8-18 | 350 | 106 | 60 | 120 | 136 |
| 150 | 1.0 | 350 | 725 | 280 | 240 | 210 | 24 | 3 | 8-18 | 350 | 146 | 60 | 145 | 163 |
| 200 | 1.0 | 400 | 820 | 335 | 295 | 265 | 26 | 3 | 8-18 | 400 | 220 | 62 | 202 | 223 |
| 250 | 1.0 | 450 | 890 | 390 | 350 | 320 | 28 | 3 | 12-23 | 400 | 315 | 62 | 225 | 278 |
| 300 | 1.0 | 500 | 1070 | 440 | 400 | 368 | 28 | 3 | 12-23 | 450 | 398 | 65 | 303 | 330 |
| 350 | 1.0 | 550 | 1320 | 500 | 460 | 428 | 30 | 4 | 16-23 | 550 | 530 | 65 | 351 | 382 |
| 400 | 1.0 | 600 | 1450 | 565 | 515 | 482 | 32 | 4 | 16-25 | 550 | 690 | 65 | 398 | 432 |
| 450 | 1.0 | 650 | 1560 | 615 | 565 | 532 | 32 | 4 | 20-25 | 600 | 870 | 70 | 460 | 485 |
| 500 | 1.0 | 700 | 1720 | 670 | 620 | 585 | 34 | 4 | 20-25 | 650 | 1080 | 78 | 500 | 535 |
| 600 | 1.0 | 800 | 1880 | 780 | 725 | 685 | 36 | 5 | 20-30 | 700 | 1350 | 90 | 600 | 636 |
| 700 | 1.0 | 900 | 2085 | 895 | 840 | 800 | 40 | 5 | 24-30 | 750 | 1950 | 90 | 690 | 726 |
| 800 | 1.0 | 1000 | 2590 | 1010 | 950 | 905 | 44 | 5 | 24-34 | 800 | 2500 | 106 | 790 | 826 |
| 50 | 1.6 | 250 | 345 | 160 | 125 | 100 | 16 | 3 | 4-18 | 250 | 28 | 48 | 49 | 58 |
| 65 | 1.6 | 270 | 395 | 180 | 145 | 120 | 18 | 3 | 4-18 | 250 | 40 | 50 | 64 | 75 |
| 80 | 1.6 | 280 | 425 | 195 | 160 | 135 | 20 | 3 | 8-18 | 300 | 58 | 52 | 78 | 91 |
| 100 | 1.6 | 300 | 510 | 215 | 180 | 155 | 20 | 3 | 8-18 | 300 | 75 | 52 | 96 | 110 |
| 125 | 1.6 | 325 | 570 | 245 | 210 | 185 | 22 | 3 | 8-18 | 350 | 110 | 60 | 120 | 136 |
| 150 | 1.6 | 350 | 725 | 280 | 240 | 210 | 24 | 3 | — | — | — | — | — | — |
Dimensions, pressure ratings, materials, connection type and actuator configuration are subject to the final WDL Valve technical drawing and approved project datasheet.
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