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Duplex Stainless Steel Butterfly Valve, Lugged Type
Butterfly Valve
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Duplex Stainless Steel Butterfly Valve, Lugged Type

In environments where chloride attack, pitting corrosion, and stress corrosion cracking pose persistent risks, standard stainless steel is insufficient. Designed for the harshest marine and chemical applications, our lugged butterfly valve is constructed from duplex stainless steel (ASTM A995 4A / 1.4469 / 2205). It delivers nearly twice the mechanical strength of 316 stainless steel and outstanding resistance to crevice corrosion in seawater, brackish water, and chloride-laden process fluids.
Manufactured entirely in‑house from precision casting to final assembly, the duplex microstructure ensures an optimal balance of high strength and corrosion resistance. This makes it the ideal solution for offshore platforms, desalination facilities, chemical tankers, and wastewater treatment systems operating in high‑chloride environments.

Series: KF-PZ-LT-SS

Type: Concentric Resilient Seated

Size: DN40-600mm, NPS 1.5”-24”

Design Standard: EN 593, API 609

Pressure Rating: PN10/PN16/125LB/150LB

Certificate: ISO, CE, WRAS, ACS

Sample: Available

Service: OEM & ODM

    Features

    Valve Body Process

    Precision cast

    Operation Cycles

    Over 100,000 times

    Leakage Level

    Class A Zero leakage

    Low Torque

    Operation easy and flexible

    Bidirectional Sealing

    Any installation position

    Lower Cost

    Simple and compact structure with high cost-effectiveness

    Low Flow Resistance

    Improve fluid efficiency and reduce energy consumption

    Wide Application

    Water treatment, petrochemicals, electricity, chemistry, etc

    Certificates

    ISO9001, CE, WRAS, ACS

    Specifications

    Design Standard

    EN 593 API 609

    Top Flange Standard

    ISO 5211

    End Flange Standard

    EN1092 PN10/16, ANSI 125LB/150LB, JIS 10K

    Face to Face Dimension

    API 609, EN558-1 Series 20, BS5155, DIN3202 K1

    Testing Standard

    API 598, EN12266

    Temperature

    -20℃~120℃(depends on the sealing material)

    Body Material

    Deplex Stainless Steel: 2205, 2507

    Disc Material

    1.4469/2205/4A, 1.4469/2507/5A, 1.4529/2520/6A...

    Shaft Material

    Stainless Steel, Aluminum Bronze, Inconel

    Seat Material

    EPDM, NBR, VITON, HYPALON, PTFE

    Operator

    Lever, Gearbox, Pneumatic, Electric Actuator

    Dimension

    Drawing122-page-0001 (16)

    Size

    L

    A

    PN10

    PN16

    ANSI 150LB

    Top      
    Flange

    Ф D1

    n - Ф d

    Ф D1

    n - Ф d

    Ф D1

    n - Ф d

    40

    32.6

    113

    110

    4-18

    110

    4-18

    98.4

    4-16

    F05

    50

    42

    128

    125

    4-18

    125

    4-18

    120.7

    4-19

    F05

    65

    45

    135

    145

    4-18

    145

    4-18

    139.7

    4-19

    F05

    80

    45

    144

    160

    8-18

    160

    8-18

    152.4

    4-19

    F05

    100

    50

    163

    180

    8-18

    180

    8-18

    190.5

    8-19

    F07

    125

    53.5

    189

    210

    8-18

    210

    8-18

    215.9

    8-22

    F07

    150

    56

    203

    240

    8-22

    240

    8-22

    241.3

    8-22

    F07

    200

    59

    243

    295

    8-22

    295

    12-22

    298.5

    8-22

    F10

    250

    65.5

    268

    350

    12-22

    355

    12-26

    362

    12-26

    F10

    300

    76.5

    313

    400

    12-22

    410

    12-26

    431.8

    12-26

    F10

    350

    76.5

    339

    460

    16-22

    470

    16-26

    476.3

    12-29

    F10

    400

    85.7

    400

    515

    16-28

    525

    16-31

    539.7

    16-28.4

    F14

    450

    104.6

    422

    565

    20-28

    585

    20-31

    577.8

    16-31.8

    F14

    500

    127

    480

    620

    20-28

    650

    20-34

    635

    20-31.8

    F14

    600

    151.4

    562

    725

    20-31

    770

    20-37

    749.3

    20-35.1

    F16

    The stainless steel lug butterfly valve is engineered for demanding fluid control applications. Its corrosion-resistant stainless steel body features integral threaded lugs, allowing direct bolting to pipeline flanges. This design is particularly suitable for system end connections or applications requiring single-side pipeline disassembly. The valve ensures bubble-tight sealing with low operating torque. The disc enables quick 90-degree operation for both on/off and modulating duties. Its robust construction withstands higher working pressures, making it ideal for chemical processing, water treatment, offshore platforms, and fire protection systems. The lug-style design guarantees secure installation and reliable performance, providing an efficient and safe solution for various piping systems.


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