Main sealing auxiliary conical surface and plane double-sealing structure for stop valve
A technology of double sealing and sealing structure, which is applied in the direction of the valve housing structure, valve lift, valve details, etc., can solve the problems of reduced sealing performance of the main seal of the valve, affecting the normal use of the valve, etc., to achieve improved sealing performance, good initial sealing performance, The effect of reducing the possibility of failure
Pending Publication Date: 2022-01-18
SUFA TECH IND CNNC
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Problems solved by technology
However, after this structure operates for a certain number of times, different degrees of indentations will be produced on the sealing surfaces of the valve disc and the valve seat, which will greatly reduce the sealing performance of the main seal of the valve, and the leakage rate will far exceed the system requirements, thus affecting the performance of the valve. Normal use
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[0017] A globe valve with a main seal, auxiliary cone surface and plane double seal adopts the structure of C-shaped ring and 15-degree inclined cone surface seal + metal plane seal. After tightening the middle flange bolts with a certain torque, the longitudinal dimensions of each part form a dimensional chain, and the longitudinal dimensions of each part are reasonably controlled so that the compression ring presses the compression ring III, and the compression ring III presses the compression ring II ,The compression ring II then presses the compression ring I, and the compression ring I presses the C-ring to pre-press the C-ring, and at the same time fix the C-ring on the valve body to prevent the C-ring from leaving the valve seat . At the same time, the valve clack and the pressing ring II form a valve clack guiding structure, which controls the skew of the valve clack and ensures the sealing performance of the valve.
[0018] When the valve is closed, the C-ring is inc...
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The invention belongs to a sealing structure, and particularly relates to a low-leakage-rate main seal double-sealing structure suitable for a nuclear-grade helium isolating valve of a high-temperature gas cooled reactor nuclear power station. A main sealing auxiliary conical surface and plane double-sealing structure for a stop valve comprises a valve body, wherein a valve cover is arranged at the top end of the valve body, a valve clack is arranged in a cavity formed by the valve body and the valve cover, and a sealing structure is arranged at the position, making contact with the valve body, of the bottom end of the valve clack. The main sealing auxiliary conical surface and plane double-sealing structure has the remarkable effects that the valve has good initial sealing performance due to the double-sealing structure, the valve can still keep good sealing performance after acting for a certain number of times, the overall structure is compact, the sealing performance of a main sealing pair of the valve is improved, and meanwhile the possibility that the main sealing pair fails is reduced.
Description
technical field [0001] The invention belongs to a sealing structure, and in particular relates to a low-leakage rate main seal double-sealing structure suitable for a nuclear-grade helium isolation valve of a high-temperature gas-cooled reactor nuclear power plant. Background technique [0002] The nuclear-grade helium isolation valve is a wide-ranging and large-scale pressure-bearing equipment in the high-temperature gas-cooled reactor. It needs to operate under high-temperature and high-pressure conditions, and plays an important role in ensuring the normal, stable operation and safety of the high-temperature gas-cooled reactor. High-temperature reactor gas-cooled reactors have high requirements on the sealing performance of the helium isolation valve, but due to the strong permeability of helium, this puts forward high requirements on the sealing performance of the main sealing pair of the helium isolation valve. At present, the common helium isolation valve adopts a sphe...
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IPC IPC(8): F16K1/46F16K27/02
CPCF16K1/46F16K1/465F16K27/0254
Inventor 汤晓刚王悦琴高志岗张易阳汝强吴莘馨严新虹王兰群高健飞俞飞李俊
Owner SUFA TECH IND CNNC