Patent ID: 8523141
Filing Date: 2013-09-03
Classification: F16K,F16L,G05D

Abstract:
1. A valve, comprising: a flow passage; a movable valve member disposed in the flow passage, wherein the moveable valve member is configured to adjust a fluid flow through the flow passage; a multi-stage throttling section disposed in the flow passage, wherein the movable valve member and the multi-stage throttling section are disposed one after another in a flow direction along the flow passage, the multi-stage throttling section comprises a first throttling component and a second throttling component disposed one after another in the flow direction, the first throttling component comprises a first material that is resistant to wear, the second throttling component comprises a second material that is resistant to cracking, and the second throttling component is configured to catch at least a portion of the first throttling component in the event of failure of the first throttling component; wherein the first throttling component comprises a first throttling disc with a first plurality of openings, second throttling component comprises a second throttling disc with a second plurality of openings, and the first and second plurality of openings are misaligned with one another; and wherein the second plurality of openings comprises larger openings than the first plurality of openings, and the second throttling disc has a greater thickness than the first throttling disc.