Method and apparatus for clearing a blockage in a pitot or static pressure line of a duct of a pressure sensor

摘要

Apparatus and method for providing the apparatus, the apparatus including: a duct; and a non-return valve; wherein the duct has a first portion and a second portion; the first portion has a first end and a second end; the first end is open to a fluid (e.g. air); the second end is connected to the second portion such that fluid is permitted to flow between the first portion and the second portion; the non-return valve is positioned at or proximate to the second end; and the non-return valve is arranged such that, upon application of a suction force to the first portion at the first end, fluid flows into the first portion via the non-return valve from outside the duct, and through the first portion from the second end to the first end.

主权项

1. A method for clearing a blockage in a pitot pressure line or a static pressure line of a duct of a pressure sensor, the duct comprising a first portion, the pitot or static pressure line, and a second portion,
the first portion having an open end and a further end; the open end being open to a fluid; the further end being connected to the second portion such that the fluid is permitted to flow between the first portion and the second portion during pressure measurement; the second portion having a first opening and a second opening, the further end being connected to the first opening, the second opening being connectable to a pressure transducer; the method comprising the steps of: arranging a non-return valve being connected to the first opening of the second portion such that the non-return valve is positioned at or proximate to the further end of the first portion; and upon application of a suction force to the first portion at the open end, fluid flows into the first portion via the non-return valve from outside the duct, and through the first portion from the further end to the open end; applying a suction force to the first portion at the open end so as to remove the blockage from the first portion; and upon application of a suction force to the first portion at the open end, the non-return valve acts to reduce effects of the suction force on the pressure transducer.