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  • Location:PRODUCTS >> Power station valve >> Vacuum cut off valve
    Vacuum cut off valve
    Model: NKZ44H-10C
    Nominal diameter: DN50 ~ 800mm
    Nominal pressure: PN1.0 ~ 35.0Mpa, 150Lb-3500Lb
    Operating temperature: -40-600 ℃
    Connection: flange, thread, butt welding, socket welding, NPT
    Main material quality: PTFE, PVC, ABS, RPP, 304,316,304L, 316L, SS316, WCB, CF3, CF8, CF3M, CF8M, cast steel, cast iron, forged steel, stainless steel, copper, etc.

    First, the product overview: 

    This series of valve connection sub-flange, welding two kinds of driving methods are manual, electric two. The valve is suitable for working temperature ≤ 425 ℃ and ≤ 550 ℃, the working medium is water, steam or air pipe, as the opening and closing device; especially suitable for thermal power plant condensing and vacuum vacuum system, vacuum isolation seal.
     

    Second, the structural features:

     1, designed a vacuum sealed packing room, the system isolated from the atmosphere, with good environmental performance. 
     2, selection of sophisticated materials, all relevant standards at home and abroad, the overall high-quality materials. 
     3, advanced and reasonable pairing pair, improve the sealing performance, long service life. 
     4, the opening and closing pieces of parallel gate with two-way flexible seal, small friction, easy opening and closing, easy maintenance, reliable sealing, excellent performance. 
     5, the stem by quenching and nitriding surface treatment, good corrosion resistance, scratch resistance and wear resistance. 
     6, flange gasket composite materials, expansion coefficient, airtight, and ensure the system and the atmosphere isolated and reliable.

     

    Third, the test pressure:

    Nominal pressure 
           PN / MPa

    Test pressure / MPa

    Shell strength test

    Seal test

    Seal 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

    6.0

    4.4

    4.4

    6.4

    8.6

    7.0

    7.0

    10.0

    15.0

    11.0

    11.0

     

    Fourth, the scope of application:

    product type

    Suitable media

    Applicable temperature / ℃

    NKZ41H 
           NKZ44H 
           NKZ944H-C type 
           NKZ941H

    Water, steam, air

    ≤425

    NKZ41H (Y) 
           NKZ44H (Y) -I type 
           NKZ944H (Y) -I type 
           NKZ941H (Y)

    Water, steam, air

    ≤550

     

    Fifth, the main components and parts:

    Part Name

    Body, bonnet

    Valve stem

    gate

    Sealing surface

    Stem nut

    filler

    fastener

    NKZ44H 
           NKZ41H-C type 
           NKZ944H-C type 
           NKZ941H

    WCB

    2Crl3

    25

    H: Alloy steel

    Aluminum bronze

    Expanded composite graphite

    High-quality carbon steel

    NKZ44 
           NKZ41Y-I type 
           NKZ944-I type 
           NKZ941

    Chrome-molybdenum steel

    20CrlMo1VA 
           38CrMoAlA

    Chrome-molybdenum steel

    Y: Carbide

    Chrome-molybdenum steel

     

    Six , size and weight:

    DN / mm

    PN / MPa

    The main dimensions and connection dimensions / mm

    Valve 
           weight 
           / kg

    Attached flange size / mm

    L

    H

    D

    D1

    D2

    b

    f

    zd

    W

    h

    D0

    Dn

    50

    1.0

    250

    345

    160

    125

    100

    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

    510

    215

    180

    155

    20

    3

    8-18

    300

    72

    52

    96

    110

    125

    325

    570

    245

    210

    185

    22

    3

    8-18

    350

    106

    60

    120

    136

    150

    350

    725

    280

    240

    210

    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

    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

    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

    510

    215

    180

    155

    20

    3

    8-18

    300

    75

    52

    96

    110

    125

    325

    570

    245

    210

    185

    22

    3

    8-18

    350

    110

    60

    120

    136

    150

    350

    725

    280

    240

    210

    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

    410

    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

    g10

    840

    788

    50

    5

    24-41

    850

    2110

    110

    690

    726

    800

    1000

    2590

    1020

    950

    898

    52

    5

    24-41

    950

    2630

    115

    790

    826

    DN / mm

    PN / MPa

    The main dimensions and connection dimensions / mm

    Valve 
           weight 
           / kg

    Attached flange size / mm

    L

    H

    D

    D1

    D2

    b

    f

    Zd

    W

    h

    D0

    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

    100

    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

    610

    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


    DN / mm

    PN / MPa

    The main dimensions and connection dimensions / mm

    Valve 
           weight 
           / kgt

    Attached flange size / mm

    L

    H

    D

    D1

    D2

    b

    f

    D6

    f2

    zd

    W

    h

    D0

    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

    110

    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

    510

    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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