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Double Ball Flange Rubber Expansion Joint
Rubber Expansion Joint
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double ball rubber joints, flanged.jpg

Double Ball Flange Rubber Expansion Joint

Beyond valves, pipeline integrity requires flexible protection. As a manufacturer, we produce these double ball rubber expansion joints to solve problems of movement, vibration, and misalignment in your piping systems—from thermal expansion to pump connection stress.

Constructed with a heavy-duty rubber body reinforced by multiple layers of cord and steel rings, this joint offers multi-axis flexibility and superior pressure resistance. The dual-sphere design provides greater lateral and angular movement capacity than single-sphere units, while the integral flanges ensure a secure, bolt-ready connection.

Engineered and Built In-House: • Reinforced Body: Natural/SBR/EPDM rubber (standard), reinforced with nylon cord and embedded steel reinforcement rings. • Flanges: Carbon steel, fully drilled to PN10/PN16 standard. • Pressure & Temperature: Rated for max working pressures up to 25 bar, temperatures from -15°C to +115°C (dependent on rubber compound). • Movement Capability: Designed to absorb axial compression/extension, lateral offset, and angular deflection. • Sizes: DN50 to DN1200 manufactured in our facility.

We control the production process from rubber compounding and molding to metal component integration and final vulcanization. Every joint is subjected to a 100% pressure test to guarantee integrity before shipment, and we can provide material certifications upon request.

Keyword: Double Ball Flange Rubber Expansion Joint, Rubber flexible joint, rubber joint, Expansion Joint, WRAS Approved Rubber Joint

Series: KF-RJT-S (9200)

Size: DN32-1200mm, NPS 1.2”-48”

Pressure Rating: PN10/PN16/PN25/150LB

Certificate: ISO, CE, WRAS, ACS

Sample: Available

Service: OEM & ODM

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    Specifications
    Dimension

    Specifications

    End Flange Standard

    PN10/16/25, ANSI 125LB/150LB, JIS, DIN, AS

    Testing Standard

    API 598

    Temperature

    -15℃~80℃(depends on the rubber material)

    Flange Material

    WCB Cold or Hot Galvanizing, SS304, SS316

    Joint Material

    EPDM, NBR, FKM, NR, SBR, Chloroprene，Rubber+PTFE

    Applicable Medium

    Water, seawater, hot water, oil, acid, alkali, etc

    Certificates

    ISO9001, CE, WRAS, ACS

    Flexible Structure

    Allow four-way movement, absorb vibration and noise

    Floating Flange Connection

    Easy installation, adapt different flange

    Function

    reduce noise and vibration, absorb thermal expansion

    Dimension

    Drawing-Rubber expansion joint
    Size D d PN10 PN16 150LB Axial Displacement Horizontal Displacement
    Ф D1 Ф D2 n - Ф d Ф D1 Ф D2 n - Ф d Ф D1 Ф D2 n - Ф d Extension Compression
    DN32 175 14 140 100 4-19 140 100 4-19 115 88.9  4-16.1 30 50 45
    DN40 175 20 150 110 4-19 150 110 4-19 125 98.4  4-16.1 30 50 45
    DN50 175 20 165 125 4-19 165 125 4-19 150 120.6  4-19 30 50 45
    DN65 175 20 185 145 4-19 185 145 4-19 180 139.7  4-19 30 50 45
    DN80 175 22 200 160 8-19 200 160 8-19 190 152.4  4-19 30 50 45
    DN100 225 24 220 180 8-19 220 180 8-19 230 190.5  8-19 35 50 40
    DN125 225 26 250 210 8-19 250 210 8-19 255 215.9  8-22.4 35 50 40
    DN150 225 26 285 240 8-23 285 240 8-23 280 241.3  8-22.4 35 50 40
    DN200 325 30 340 295 8-23 340 295 12-23 345 298.4  8-22.4 35 50 35
    DN250 325 32 395 350 12-23 405 355 12-28 405 361.9  12-25.4 35 60 35
    DN300 325 32 445 400 12-23 460 410 12-28 485 431.8  12-25.4 35 60 35
    DN350 325 39 505 460 16-23 520 470 16-28 535 476.2  12-28.4 35 60 35
    DN400 325 42 565 515 16-28 580 525 16-31 595 539.7  16-28.4 35 60 35
    DN450 325 45 615 565 20-28 640 585 20-31 635 577.8  16-31.8 35 60 35
    DN500 325 48 670 620 20-28 715 650 20-34 700 635.0  20-31.8 35 60 35
    DN600 325 55 780 725 20-31 840 770 20-37 815 749.3  20-35.1 35 60 35

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