Cryogenic ball valve
A ball valve, low temperature technology, applied in valve details, valve device, valve operation/release device, etc., can solve problems such as poor sealing and fastener failure, and achieve the effect of good sealing and safe and reliable structure
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Embodiment 1
[0019] as attached Figure 1~2 As shown, the cryogenic ball valve described in this embodiment includes a valve body 10 , a ball body 20 and a driving component 30 . Wherein, the valve body 10 includes a valve seat 11 and a fluid passage 12 above the valve seat, the fluid passage 12 has a fluid inlet 13 at one end and a fluid outlet 14 at the other end; The ball 20 is arranged on the valve seat 11 and contacts with the valve seat 11 to form a valve seat sealing surface 15 . The sphere 20 includes a transverse channel 21. When the axis of the transverse channel is aligned with the axis of the fluid channel by rotating the sphere, the fluid inlet and the fluid outlet are in the maximum flow state; when the sphere is rotated Placing the axis of the transverse channel at an angle to the axis of the fluid passage reduces or closes fluid communication between the fluid inlet and the fluid outlet. The drive part 30 includes a drive shaft 31, a segmented tooth segment 32 and a turbi...
Embodiment 2
[0021] In this embodiment, in order to endow the sphere with mechanical properties in a low-temperature environment, especially mechanical properties such as thermal shock resistance and low-temperature heat resistance, the sphere is forged from hardened steel. The chemical composition of the hardened steel is as follows: 0.05-0.08wt% of C, 0.20-1.5wt% of Si, 0.30-1.50wt% of Mn, 0.20-0.50wt% of Ni, 2.5-3.0wt% of Cr, 0.10 ~0.25wt% Cu, 0.01~0.05wt% Al, 0.01~0.05wt% Mo (preferably 0.01~0.02wt%), 0.005~0.015wt% N, 0.02~0.10wt% Ti, 0.002~ 0.005 wt% Zr; balance Fe and unavoidable impurities. Among them, [Cu], [Ni], [Mo], and [Cr] represent the mass percentages of Cu, Ni, Mo, and Cr, respectively, and they satisfy the following inequality: 2.5[Cu]+1.2[Ni]+4.9[Mo] +1.1[Cr]≥3.4.
[0022] The sphere is forged and shaped, then heated to 800-850°C for 30-60 minutes, and air-cooled; then high-temperature carburizing is carried out at 1000-1050°C, the carbon potential is 0.6-0.8wt%, and t...
Embodiment 3
[0024] In this embodiment, the surface of the sphere and the sealing surface of the valve seat are formed with a low-friction hard coating, and the low-friction hard coating needs to have both high hardness and low friction coefficient, so as to ensure the sealing while Realize the good operation of the sphere. The composition of the low-friction hard coating is 10.0-15.0wt% tungsten carbide, 3.0-5.0wt% molybdenum disulfide, 12.0-15.0wt% aluminum, 10.0-12.0wt% chromium, 0.1-1.0wt% % zirconium, and the remainder nickel; the thickness of the coating is generally 10-200 μm, preferably 20-100 μm. The above-mentioned coating adopts powder raw materials, and through ball milling in an inert atmosphere, the particle size of aluminum, chromium, zirconium and nickel in the powder raw material is less than 10 μm, while the particle size of molybdenum silicon disulfide and tungsten carbide is 10-20 μm. Then use the supersonic flame spraying system to spray, the powder feeding gas used i...
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