Patent ID: 11958001
Assignee: SULZER MANAGEMENT AG
Field: Chemical engineering (Chemistry)
Classification: CPC B  F | IPC B  F

Claim 5:
6. A valve tray for use in a chemical-process column, the valve tray comprising:
a tray surface having at least one aperture formed therein, the at least one aperture being of an aperture area;
a retaining cage disposed on the tray surface proximate the at least one aperture, the retaining cage comprising:
as an upper portion, a strap extending over a top surface of a valve cover and restricting vertical travel of the valve cover;
a first leg and a second leg extending downwardly from the upper portion and coupled to the tray surface proximate the at least one aperture; and
the valve cover disposed in the retaining cage, the valve cover comprising:
the top surface having a surface area;
a vane extending around an edge of the top surface, the vane being a continuous circumferential vane that extends outwardly and downwardly from the top surface at a uniform angle continuously around the top surface,

wherein the valve cover comprises a pair of oppositely disposed notches, each of the oppositely disposed notches defined by oppositely-disposed edges, the oppositely-disposed edges being on opposite sides of one of the first leg and the second leg, one of the pair of oppositely disposed notches receiving the first leg and the other receiving the second leg, each notch of the pair of oppositely disposed notches being sized such that rotation of the valve cover relative to the legs is constrained,
wherein the aperture area is smaller than the surface area, and
wherein a width of each notch of the pair of oppositely disposed notches is approximately a same size as a width of the respective one of the first leg and the second leg that is received by the notch.