Various manufacturing standards for two-way sealing butterfly valves

    The butterfly valves we usually see usually have an indicator arrow on the valve body. Everyone knows that this arrow indicates the direction of fluid flow during installation, but some butterfly valves do not have this arrow on the valve body. Don’t think This is forgotten by the manufacturer. In fact, this kind of butterfly valve without arrows does not need to pay attention to the flow of the medium during installation. Its name is two-way sealing butterfly valve. In the design, the force on the stem of this butterfly valve is basically greater than that of the ordinary butterfly valve, and the performance is better than that of the ordinary one-way sealing butterfly valve. You can refer to the following manufacturing standards for two-way sealing butterfly valves:

    1. Design and manufacture: GB12238-89 standard.

    2. Structure length: GB12221-89 standard, GB/T15188.1-94 standard.

    3. Flange connection: GB/T17241.6-98 and GB9115-88, GB12380-90, GB4216.4 standards.

    4. Flow rate and flow resistance coefficient: JB/T5296-91 standard.

    5. Pressure test: GB/T13927-92 standard.

    6. Life test: JB/Z248-85 standard.

    7. Valve mark: GB12220-89 standard.

    8. Paint film test and painting: GB9286, SDZ014 standards.

    9. Grade of corrosion and derusting of steel surface: GB8982 standard.

    10. Anti-rust packaging: GB191 standard.