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