High-temperature helium level sealing isolation valve for nuclear power station
A technology for nuclear power plants and isolation valves, used in shaft seals, lift valves, valve details, etc., to solve problems such as difficulty in achieving helium-level sealing performance requirements
Pending Publication Date: 2020-06-12
JIANGSU SHENTONG VALVE
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Problems solved by technology
[0002] Due to the strong permeability of helium, it is difficult to achieve the sealing performance requirements of helium level for valves with ordinary structures under high temperature conditions (helium temperature 250°C).
Method used
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[0015] As shown in the figure, a high-temperature helium-level sealed isolation valve for nuclear power plants includes a valve body 12, a valve cover 5, a valve stem 10, a stuffing box 2, a packing pressure plate 11, a valve disc 13, a valve cover 5 and a stuffing box 2, The abutment surface of the valve body 12 is provided with a metal O-ring 4 to realize the primary seal of the static seal between the valve body 12 and the valve cover 5. The main material of the metal O-ring 4 is 1Cr18Ni9Ti, the outer surface is plated with silver, and the thickness is 30-40 μm , used to metal compensate the surface defects of the O-ring 4 pipe and enhance the corrosion resistance and sealing performance. There is a lip sealing weld 3 at the connection between the valve cover 5 and the stuffing box 2 and the valve body 12. When the sealing performance of the metal O-ring 4 In the event of failure, the lip can be welded to provide a secondary seal. The bellows is connected to the valve stem,...
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Abstract
The invention discloses a high-temperature helium level sealing isolation valve for a nuclear power station. The isolation valve comprises a valve body, a valve deck, a valve rod, a stuffing box and avalve clack, wherein metal O-shaped rings are arranged on the abutting faces between the valve deck and the stuffing box as well as the valve body, lip edge sealing welding is arranged at the jointsbetween the valve deck and the stuffing box as well as the valve body, a corrugated pipe is connected to the valve rod and connected with the stuffing box, the stuffing in the stuffing box is dividedinto upper and lower stuffing through a spacer ring, a spring is arranged on a stuffing pressing plate, an anti-rotation key is arranged in the stuffing box, a valve clack sealing pair is subjected tosurfacing STL.6, and a valve body sealing pair is subjected to surfacing STL.12. The isolation valve has the beneficial effects that the corrugated pipe, the stuffing and a spring self-compensating pre-tightening force structure are adopted, the metal O-shaped rings and the lip edge sealing welding structure are adopted, and the hardness difference and the surface roughness of the valve clack andvalve body sealing pairs are controlled, so that the sealing performance of the valve reaches the helium level.
Description
technical field [0001] The invention relates to an isolation valve, in particular to a high-temperature helium-level sealed isolation valve for nuclear power plants. Background technique [0002] Due to the strong permeability of helium, it is difficult to achieve the sealing performance requirements of helium level for valves with ordinary structures under high temperature conditions (helium temperature 250°C). Contents of the invention [0003] In order to overcome the above-mentioned problems in the prior art, the present invention provides a high-temperature helium level-sealed isolation valve for nuclear power plants. [0004] The technical solution of the present invention is a high-temperature helium-level sealed isolation valve for nuclear power plants, including a valve body, a valve cover, a valve stem, a stuffing box, a packing pressure plate, and a valve disc. There are metal O-rings, lip sealing welds are provided at the connection between the valve cover and...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F16K1/00F16K1/32F16K1/38F16K1/42F16K1/46F16K27/02F16K27/08F16K41/08F16K41/06F16K41/10F16K41/16
CPCF16K1/00F16K1/32F16K1/385F16K1/42F16K1/46F16K27/0254F16K27/08F16K41/06F16K41/08F16K41/10F16K41/16
Inventor 张清双吴春豪徐雷秋
Owner JIANGSU SHENTONG VALVE