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Main standards for stop valves

Support 2022/3/20 15:19:29    admin    Hits 834

    Main standards for stop valves


    ① Gb12233-89 general purpose valves and iron globe valves


    ② Gb12235-89 general purpose valves flanged steel globe valves and lift check valves


    ③ JB / t53174-94 quality grading of stop valve products


    ④ JB / t53165-92 product quality grading of high pressure balance stop valve


    ⑤ Marine blue bronze globe valves (GB / t587-93)


    ⑥ GB / t590-93 marine blue iron globe valves


    ⑦ Gb8464-87 general technical conditions for gate, globe and check valves with internal thread connection


    ⑧ Gb8465.2-87 gate valves, globe valves, ball valves and iron globe valves with basic dimensions with internal thread connection


    Main performance of stop valve


    ① Compared with, the regulating performance is better, but because the valve rod does not rise and fall from the handwheel, it is difficult to identify the regulating amount;


    ② The flow resistance is larger than that of gate valve, ball valve and;


    ③ Less sealing surface than gate valve;


    ④ The sealing performance is generally worse than that of the gate valve. For the medium containing mechanical impurities, the sealing surface will be vulnerable when the valve is closed;


    ⑤ The price is cheaper than the gate valve;


    ⑥ Suitable for steam medium; It is not suitable for medium with high viscosity, particles, easy coking and easy precipitation; Plug valve gate valve


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