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    Customer Service

    Common Problems
    1. How to correctly select sealing parts?
    Notes to maintenance customers

        When selecting sealing parts for maintenance, most customers will purchase according to the size and color of sample. This will increase the difficult in purchase and customers will not always select an appropriate product. We suggest that customers adopt the following procedure to enhance the accuracy of purchasing sealing parts:
        1. Direction of motion: confirm the direction of motion at the position of sealing part first, such as moving back and forth, rotation, helical motion or fixation.
        2. Key point of seal: for example, confirm that the active point is at the pull rod seal within inner diameter or piston seal within outer diameter.
        3. Temperature rating: look up operating temperature from the original machinery instructions or evaluate it according to actual working environment and determine the material required; refer to the notes to production customers below for description of temperature rating.
        4. Pressure rating: look up relevant data from the original machinery instructions, or infer the operating pressure rating by observing the hardness and structure of original sealing part; refer to the notes to production customers below for description of pressure rating.
        5. Size: Most customers will purchase based on the old used sample, but the original size of sealing part will be greatly affected by temperature, pressure, wear and other factors after use for a time period. Sample can only be used as a reference and the better method is to measure the dimension of metallic channel at the position of sealing part, so as to enhance the accuracy.
        Notes to production customers
        The general causes for damage of sealing parts are almost the working requirements for sealing parts:
        1. Hardening (ageing): One of the causes for leakage of sealing part is that its own material is hardened under the influence of temperature. When the hardness is too high, the sealing part cannot fill the gap with supporting part, so leakage will occur.
        2. Wear: Wear of sealing part involves the surface smoothness, kinematic velocity and driving medium of supporting part and different sealing materials are adapted to different kinematic velocities.
        3. Extrusion: The sealing part will be extruded to the gap between metals under overpressure, and then is will be damages and leakage will occur. This case involves the hardness of sealing part and gap between metals. If the design, model selection, processing or installation is improper, damage will be caused by extrusion.
        4. Corrosion: The result is that the sealing part is softened and even dissolved and the cause is that the sealing part is invaded by medium due to selection of wrong material. Special attention shall be paid when the medium contains water or solvent.
        5. General sealing parts can be simply classified according to temperature, velocity, pressure and material (only for reference):
        Temperature rating Applicable material Velocity Applicable material Pressure rating Applicable material
        110℃ Nitrile rubber/Polyurethane 0.5 M/S Nitrile rubber 200kg/cm2 Support hardness and design
        200℃ Fluororubber 0.6 M/S Polyurethane 400kg/cm2 Support hardness and design
        260℃ Teflon 14 M/S Teflon 700kg/cm2 Support hardness and design

    Tel:0086-029-38612527 Fax:0086-029-38624122 E-mail:FHXM8612527@126.COM
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