• Knowledge for valve parts 002

    Chapter C: Valve stem

    The valve stem bearing the tensile, compressive and torsional forces while the valve opening and closing. The valve stem could contact with media directly, and could also have relevant friction movement against valve packing. So, the material used for valve stem has to be sufficient strength and toughness under certain required temperature. And also has to be anti-corrosion, scratch resistance, and good manufacturability.

    1. Carbon steel
    2. Alloy steel
    3. stainless acid resistant steel
    4. heat resisting steel

    Chapter E: Valve stems Nut, Fastener, Packing, Valve Bonnet Gasket

    Stem nut bearing axial while opening and closing the valve, the material used for stem nut has to be sufficient strength. and the nut screw drive with the stem,it has to be low friction coefficient and antirust as well.

    1. Copper Alloy
    2. Carbon steel
    3. stainless acid resistant steel

    Chapter F

    Fastener, Packing, Valve Bonnet Gasket

    1.Fastener Material

    Fastener including bolts, studs and nuts. Fasteners bearing pressure on valve directly, and it is crucial importance to prevent media leaking, so the materials has to be sufficient strength and toughness under certain required temperature

    2. Valve packing

    The valve packing is used to fill the space between valve bonnet and packing room, to prevent the media leaking through the stem and packing space. So, the material has to be

    1) Good corrosion resistance

    2) Good sealing

    3) Low friction coefficient

    3. Valve Bonnet Gasket

    Gasket is used to fill the joint surface (For example: between body and bonnet sealing surface) to prevent media leaking from the joint surfaces. So, the material has to be

    Good elasticity and plasticity, and has to be sufficient strength to ensure the sealing, and also require to be corrosion resistance.

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