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1) The sealing pair consists of a non-metallic soft material and a non-metallic soft material.
2) The sealing pair consists of a metal hard material and a non-metal soft material.
(2) Metal hard seal butterfly valve. The sealing pair consists of a metal hard material and a metal hard material.
3. According to the type of seal (1) forced seal butterfly valve 1) elastic seal butterfly valve. Sealing ratio pressure When the valve is closed, the valve plate squeezing the valve seat, the elasticity of the valve seat or the valve plate is generated. 2) The torque sealing butterfly valve is applied. The seal specific pressure is generated by the torque applied to the valve shaft. (2) Filling the sealing butterfly valve. The sealing ratio pressure is generated by the pressure on the valve seat or the spring seal element of the valve plate. (3) Automatic sealing butterfly valve. The seal pressure is automatically generated by the medium pressure.
4. Classified by working pressure (1) Vacuum butterfly valve. The working pressure is lower than the butterfly valve of the standard atmosphere.
(2) Low pressure butterfly valve. Nominal pressure PN <1.6MPa butterfly valve.
(3) Medium pressure butterfly valve. Nominal pressure PN is 2.5--6.4MPa butterfly valve.
(4) High pressure butterfly valve. The nominal pressure PN is a butterfly valve of 10. 0-80.0 MPa.
(5) Ultra-high pressure butterfly valve. Nominal pressure butterfly valve with PN >100MPa.
5. Classified by operating temperature (1) High temperature butterfly valve. t>450C Butterfly Valves (2) Medium Temperature Butterfly Valves. 120C <t <450C butterfly valve (3) normal temperature butterfly valve. A 40C <t <; 120C butterfly valve (4) low temperature butterfly valve. A 100 <t <a 40C butterfly valve (E) cryogenic butterfly valve. t<a 100C butterfly valve 6. According to the connection classification (1) wafer type butterfly valve.
(2) flange type butterfly valve.
(3) Ear-type butterfly valve.
(4) Welded butterfly valve
The principle of metal spinning process is to cover the processed metal blank (tube blank) on the mandrel, while the blank is pressed at the end of the mandrel by the tail, and rotates with the mandrel along the spindle, and the rotary wheel moves along the mandrel.
Generally speaking, light automatic spinning machines have structural advantages similar to ordinary lathes. However, in order to meet the requirements of the above spinning process, large spinning machines usually have the following 11 core advantages.
1. The automatic spinning machine bed, main shaft, and transmission system, rotating wheel frame, tailstock and other parts should have sufficient rigidity, and also have a heavier worktable, a thicker guide rail, and a thick wall bearing support And cabinets.
2. The horizontal and longitudinal feed mechanisms of the rotary frame are mostly driven by hydraulic transmission or a combination of mechanical and hydraulic pressure to generate sufficient spinning pressure and balance step-less speed regulation to meet process requirements.
3. Ordinary automatic spinning machines usually use one rotary wheel, but there are multiple auxiliary forming wheels (flanging wheel, curling wheel, etc.). The number of rotating wheels or rotating frame of the powerful automatic spinning machine is 2 to 3 (the general type is 2, and the cylindrical part spinning machine is mostly 2 to 3), and is symmetrical to the spindle axis. Balancing the radial force during spinning, reducing the bending deflection, deflection, and vibration of the spindle and core mold provides a prerequisite for improving the accuracy of spinning parts. This correspondingly requires the rotary wheel to have a higher horizontal (such as a special spinning machine for cylindrical parts) or a longitudinal (such as a general-purpose automatic spinning machine) synchronous feed accuracy. However, a rotary wheel is used for the light and powerful automatic spinning machine.
4. The main shaft has sufficient transmission torque and power. According to the specific process requirements, it can meet the constant torque or constant power adjustment. In addition, it is best to make the spindle speed and the longitudinal feed speed of the rotary wheel steplessly adjustable. On the one hand, it can meet the arbitrary selection requirements of the spinning process; on the other hand, it can maintain the surface rotation speed of the core mold during the spinning process. Possibility of constant feed per revolution.
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Jiangsu Hoston Machine Tools Co., Ltd. , https://www.hosdunmachinetools.com