Execution standards for upper-mounted gate-type metal hard-sealed butterfly valves

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Product Overview of Top-mounted Gate-type Metal Rigid-seal Butterfly Valve: The top-mounted gate-type metal rigid-seal butterfly valve is another new product developed on the basis of the multi-layer, triple-eccentric metal rigid-seal butterfly valve. In addition to possessing all the excellent properties of multi-layer, triple-eccentric metal hard-sealed butterfly valves, it can also withstand pressure in both directions. The greatest advantage of this valve is that it can be repaired on-site. Depending on the material chosen for the valve body, the operating temperature can range from -29°C to 550°C. Thanks to its excellent flow control capabilities, it can both shut off the medium and adjust its flow rate as desired. Product features of the top-mounted gate-type metal hard-seal butterfly valve: The top-mounted gate-type metal hard-seal butterfly valve is mainly composed of a valve body, valve cover, butterfly plate, valve shaft, valve body seal ring, butterfly plate seal ring, shaft sleeve, bottom cover, and driving mechanism. It has the following advantages: The top-mounted gate structure solves the problem that traditional eccentric butterfly valves cannot be repaired on-site. As with the original multi-layer three-eccentric butterfly valves, when the sealing ring is damaged, it is necessary to send them back to the manufacturer for repair, or the butterfly valve must be considered scrapped. With the upper-mounted gate-type butterfly valve, it is not necessary to remove it from the pipeline. It only takes a short amount of time to open the valve cover, after which the valve stem and butterfly disc can be taken out of the valve body for repair or replacement of the seal ring. Once the valve cover is closed again to seal the opening, the valve can remain in use without disrupting the normal operation of the pipeline system, thus minimizing any operational losses resulting from valve maintenance ； Possesses all the excellent properties of multi-layer, triple-eccentric metal hard-sealed butterfly valves ； Reliable sealing performance, achieving a gas-tight seal with no leaks ； The butterfly valve features a streamlined design, offering high strength, a large flow area, low flow resistance, and energy savings ； Execution standards for upper-mounted gate-type metal hard-sealed butterfly valves: 1. The design and manufacture of the valves are in accordance with GB/T12238-1989 \"General Valves – Butterfly Valves with Flanges and Clamp Connections\" and JB/T8527-1997 \"Metal-Sealed Butterfly Valves\" ； 2. The pressure testing of valves shall be carried out in accordance with GB/T13927-1992 \"General Valves – Pressure Testing\" and JB/T9092-1999 \"Inspection and Testing of Valves\" ； 3. The structural length of the valve is in accordance with GB/T12221-2005 \"Metal Valves – Structural Length\" ； 4. The dimensions of flange connections shall comply with GB/T9113.1-2000 \"Flat and raised integral steel pipe flanges\".