High-pressure-difference stop valve with V-shaped grooves formed in outer circle of lengthened valve clack

Abstract

The invention belongs to stop valves, and particularly relates to a high-pressure-difference stop valve with V-shaped grooves formed in the outer circle of a lengthened valve clack. The high-pressure-difference stop valve with the V-shaped grooves formed in the outer circle of the lengthened valve clack comprises a valve body and the valve clack. The valve clack is arranged in a channel of the valve body, and the valve clack can be controlled by the outside to be closed and opened. The valve body is a lengthened valve body, and the V-shaped grooves of the lengthened head of the valve clack arearranged on the valve body and the lengthened part. The stop valve has the effects that through the moving seal principle of the labyrinth seal structures of the V-shaped grooves, the leakage rate ofthe valve is effectively controlled, the fluid speed between seal faces of the valve clack is reduced, the overall seal performance of the valve is improved, the service life of the valve is prolonged, and the stop valve is an anti-scouring stop valve quite suitable for high-temperature and high-pressure-difference environments.

Description

technical field [0001] The invention belongs to a cut-off valve, in particular to a high-pressure-difference cut-off valve with a V-shaped groove on the outer circle of an elongated valve disc. Background technique [0002] Existing anti-scouring globe valve, disc seal structure, such as figure 1 , the structure is that after the valve disc sealing surface is separated, the valve disc has not completely left the valve outlet channel, and the flow is throttled by the cooperation gap between the valve body and the valve disc, which belongs to the principle of gap sealing, thereby improving the anti-scouring performance of the valve. This structure Although the anti-scouring performance has been improved to a certain extent, according to the use of thermal power plant owners, especially for some ultra-supercritical units with ultra-high pressure and high-temperature medium at one end and atmospheric pressure at the other end, the service life is relatively short. It is not ide...

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Problems solved by technology

[0002] Existing anti-scouring globe valve, disc seal structure, such as figure 1 , the structure is that after the valve disc sealing surface is separated, the valve disc has not completely left the valve outlet channel, and the flow is throttled by the cooperation gap between the valve body and the valve disc, which belongs to the principle of gap sealing, thereby improving the anti-scouring performance of the valve. This structure Although the anti-scouring performance has been improved to a certain extent, according to the use of thermal power plant owners, especially for some ultra-supercritical units with ultra-high pressure and high-temperature medium at one end and atmospheric pressure at the other end, the service life is relatively short. Not ideal, seriously affecting the safety of boiler use

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