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    Introduction to Ball Valves: Materials

    Ball valves are constructed by various parts. The material of each valve part must be deliberately selected. Usually several parts of the ball valve are exposed to pressure, process fluid, corrosion, and other effects of the service. There parts are considered as pressure-retaining parts including body, bonnet, bonnet bolting, ball, seat as well as stem. Miscellaneous gaskets and packing materials must also be taken into consideration.

    1. Typical Materials of Body & Bonnet  & Stem for Ball Valves

    1) Castings: ASTM A216 WCB / WCC, 
                      ASTM A217 WC1 / WC4 / WC5 / WC6 / WC9 / WC11 / C5 / C12 / CA15,
                      ASTM A351 CF3 / CF8 / CF3M / CF8M, 
                      ASTM A352 LCB / LCC,
    2) Forgings: ASTM A105,
                        ASTM A181 CL60 / CL 70,
                        ASTM A350 LF1 / LF2,
                        ASTM A182 F1 / F2 / F5 / F6a / F6a / F9 / F11 / F12 / F21 / F22 / F9 / F91
                                           F51 / F53 / F44 / F55
                        ASTM A182 F304(L) / F316(L) / F310 / F321 / F347 
                        13%Cr, 18-8Cr-Ni, 25-20Cr-Ni, 19-29Cr-Ni, 17-4PH, Stellite, 
    3) Special Alloys: Aluminum, Bronze, Inconel 600, Inconel 625, Monel 400, Monel K-500, 
                                Incoloy 825, Hastelloy B, Hastelloy C, Titanium, Nickel, 

    2. Typical Materials of Gaskets for Ball Valves

    There are two types of common gaskets employed  in ball valves: flat & spiral wound. Their materials are available in: 
    Virgin  PTFE, Reinforced PTFE, SS304/Asbestos, SS316/Asbestos, SS316/PTFE, 

    3. Typical Packing Materials

    VPTFE(virgin polytetrafluoroethylene packing), Filled PTFE Packing, Asbestos Packing, 
    AFP(asbestos-free packing), Graphite Packing, PFE Packing, Braided Graphite Packing.

    4. Common Bolting Materials of Ball Valves

    ASTM A193 B7 / ASTM A194 2H,    ASTM A193 B7/ ASTM A194 7,
    ASTM A320 B8 / ASTM A194 8,    ASTM A193 B8M / ASTM A194 8M,
    ASTM A320 L7 / ASTM A194 4
                                Introduction to Ball Valves: Design Features
                                         Introduction to Ball Valves: General & Technical Details


    Views:   Author:hbmetals  Date:15/04/03