The top-loading metal hard sealing butterfly valve is a new butterfly valve product developed on the basis of multi-level three-eccentric metal hard sealing butterfly valve according to user requirements. In addition to the excellent performance of the three-eccentric multi-layer metal hard seal butterfly valve, it can also be pressurized in both directions. The biggest advantage of the top-loading butterfly valve is that it can be repaired on site. With the choice of valve body material, the temperature can be used from -29 ° C to 550 ° C. Due to its good flow characteristics, the cut-off medium can be turned off or the flow rate of the medium can be adjusted arbitrarily. The top-loading hard-sealed butterfly valve is suitable for medium temperature -29°C-600°C, and the nominal pressure is 0.6-2.5MPa. The medium is water, steam, oil, hot air, corrosive and other pipelines to achieve the flow of shut off fluid and regulate medium flow. The purpose is to optimize the opening and closing mechanism on various pipelines. Top-mounted hard seal butterfly valve control method: worm gear, electric, pneumatic, pipe network 1. The new top-loading structure solves the problem that traditional eccentric butterfly valves cannot be repaired in the field. According to the original multi-level three eccentric butterfly valve, when the sealing ring is damaged, it needs to be transported back to the manufacturer for repair or a butterfly valve is scrapped. The top-loading butterfly valve does not need to be removed from the pipeline. It takes only a small amount of time to open the bonnet and can be removed from the valve body cavity together with the valve stem and the disc to repair or replace the sealing ring, and then the bonnet is sealed. , can realize that the valve can not affect the normal operation of the pipeline system during maintenance, so that the loss of benefits caused by the maintenance valve is minimized; 2. All the excellent performance of the multi-level three eccentric metal hard sealing butterfly valve; 3. Reliable sealing function, up to air seal without leakage; 4. The streamlined design of the butterfly plate has high strength, large flow area, small flow resistance and energy saving. The top-loading hard-seal butterfly valve is mainly composed of a valve body, a valve cover, a butterfly plate, a valve shaft, a valve body sealing ring, a butterfly plate sealing ring, a bushing, a bottom cover and a driving device. By rotating the butterfly valve handwheel, the worm and worm wheel are driven to rotate, and the worm wheel drives the valve stem and the butterfly plate to rotate freely within 90 degrees with respect to the valve body to open and close the top-loading butterfly valve, thereby realizing the flow and cutoff of the regulating medium. For the purpose of the fluid, the butterfly valve rotates the handwheel in a clockwise direction to close. 1. The design and manufacture of the valve are as follows: GB/T12238-1989 "Universal valve flange and wafer connection butterfly valve", JB/T8527-1997 "Metal sealing butterfly valve"; Application range
Features
The working principle of the top-loading butterfly valve:
Hard seal butterfly valve implementation standard
2. The valve pressure test is in accordance with: GB/T13927-1992 "General Valve Pressure Test", JB/T9092-1999 "Valve Inspection and Test";
3. The length of the valve structure is as follows: GB/T12221-2005 "Metal valve structure length";
4. The flange connection size is as follows: GB/T9113.1-2000 "flat, convex integral steel pipe flange".