Patent ID: 6223774
Filing Date: 2001-05-01
Classification: F15B,F16K,Y10T

Abstract:
A redundant regulation valve for controlling fluid flow, the valve comprising a valve body defining a fluid flow passage, said valve body comprising first guiding means for guiding a main throttle element that is movable by means of a main control device to selectively obstruct said passage, and second guiding means for guiding a redundant throttle element movable by means of a redundant control device, wherein said first and second guiding means are aligned together so that the main and redundant throttle elements are moved by said main and redundant control devices relative to each other in the valve body such that in the closed position of the valve, in normal operation, the main element and the redundant element are in contact with each other, wherein in said normal closed position, the main element is in the vicinity of its position of maximum displacement in the closure direction and obstructs only about half of the passage, while the redundant element is in a medium displacement position, and wherein the stroke of the redundant element is such that the redundant element can be controlled to obstruct the passage even when the main element is in its fully-open position.