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Type 21 elastomer bellow seal for standard pumping applications
Elastomer Bellow Mechanical Seal

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GW 21,21T.jpg

Type 21 elastomer bellow seal for standard pumping applications

Model: GW 21/21T

Stationary seat: GW T11

Features:

•   Elastomer bellows rotating

•   Unbalanced design

•   Bi-directional operation

•   Single spring pusher type

•   Parallel spring

•   Self-adjusting seal head

•   Non-clogging

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    This mechanical seal is a robust solution for numerous industries and fluids, including:

       •   Wastewater and Water Systems: Potable water, sewage water, treatment plants, and HVAC
       •   General Industrial Services: Pumps, compressors, chillers, and other rotating equipment
       •   Chemical and Process Industries: Mild corrosive fluids and chemical contents
       •   Oil & Fuel: Light oil and fuel products
       •   Pulp & Paper and Food Processing

    DETAILS & SPECIFICATIONS

    Product Detail

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    The GW 21/21T features a resilient rubber diaphragm bellows that clamps tightly to the shaft, providing a positive drive to the seal head and face. The parallel spring design ensures constant face loading, while the self-adjusting head compensates for minor shaft misalignment and wear.

    A key advantage of this design is its ability to protect the shaft and sleeve from wear and scoring. The drive band and notches are engineered to eliminate excessive stress on the bellows components. This model is compatible with common metric and imperial USA market seal chambers and fits popular pump models like the A-C Pump 2-1/2X2 SLH.

    Notably, the GW 21/21T follows the proven design principle of the John Crane Type 21, which is often used as a standard configuration in OEM pumps.

    Equivalent Products

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    Our GW 21/21T is a high-quality, ISO9001-certified alternative to the following major brands, offering identical dimensional specifications and performance at a more competitive price:

    • AESseal®: Type N-P04/P04T
    • Vulcan®: Type 11
    • JohnCrane®: Type 21
    • EagleBurgmann®: Type MG921
    • Flowserve Pac-Seal®: Type110/ Type 3/ Type 1 CUPN
    • Lidering®: Type LRB01
    • U.S. Seal®: Type 2
    • Sterling®: Type 212A
    • Roten®: Type 21A
    • Flexaseal®: Type 21
    • M.T.U. ®: FP/T35

    Material and Operating Range

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    Construction Materials:
    • Rotary ring: Carbon/SiC/TC
    • Stationary ring: 99% Ceramic /SiC/TC
    • O-ring: VITON/NBR/EPDM
    • Spring & Metallic Parts: SUS304/SUS316

    * Base plate can be removed if required *Custom configurations are available for special requirements. Please contact us for tailored solutions.


    Operating Range:
    • Temperature: -40 ℃～180℃
    • Pressure: ≤1.0 MPa
    • Speed: ≤15m/s
    • Performance: wear
    • Media: Water, oil, sewage, mild chemicals, and other non-abrasive fluids.

    Installation Dimensions

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    GW 21,21T
    Inches Size Metric size D3 D31 D1 L1 L2
    0.500 12.7 24.00 22.80 25.40 20.62 7.95
    0.625 15.8 26.70 26.70 31.75 22.23 10.31
    0.750 19.1 31.20 30.40 34.93 22.23 10.31
    0.875 22.2 33.50 33.40 38.10 23.80 10.31
    1.000 25.4 43.20 39.30 41.28 25.40 11.10
    1.125 28.6 45.50 42.00 44.45 26.97 11.10
    1.250 31.7 47.40 45.80 47.63 26.97 11.10
    1.375 34.9 52.70 49.30 50.80 28.58 11.10
    1.500 38.1 56.00 52.80 53.98 28.58 11.10
    1.625 41.2 59.20 55.50 60.33 34.93 12.70
    1.750 44.4 65.10 61.00 63.50 34.93 12.70
    1.875 47.6 66.70 64.00 66.68 38.10 12.70
    2.000 50.8 73.00 66.00 69.85 38.10 12.70
    2.125 53.9 73.50 71.50 76.20 42.85 14.27
    2.250 57.1 78.60 79.60 79.38 42.85 14.27
    2.375 60.3 82.00 79.60 82.55 46.05 14.27
    2.500 63.5 85.00 81.50 85.73 46.05 14.27
    2.625 66.6 88.50 84.60 85.73 49.20 15.88
    2.750 69.8 90.00 90.00 88.90 49.20 15.88
    3.000 76.2 102 96.8 98.4 52.37 15.88

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