Valve cage and bypass valve

Abstract

The present application relates to the technical fields of bypass valve, and discloses a valve cage and a bypass valve, the valve cage comprising a first pressure reduction section, a plurality of first pressure reduction channels are arranged on the first pressure reduction section, the first pressure reduction channel comprises a medium inlet section, a first expansion section, a bending and detour section, a second expansion section and a medium outlet section which are sequentially communicated, one end of the medium inlet section away from the first expansion section extends to the outer peripheral wall of the valve cage, one end of the medium outlet section away from the second expansion section extends to the inner peripheral wall of the valve cage, the bending and detour section is configured to make the first pressure reduction channel have at least two turning positions, and the first expansion section and the second expansion section are configured to make the first pressure reduction channel have at least two regions with expanded flow cross-sectional area in the direction from the inlet of the first pressure reduction channel to the outlet of the first pressure reduction channel. The setting of the first pressure reduction channel improves the pressure reduction effect of the valve cage, inhibits the erosion damage of high-pressure steam to each component of the bypass valve, and prolongs the service life of the bypass valve.