초록 ▼

A spool valve includes a disposable, replaceable cylinder containing gaseous media under pressure which is selectively introduced into the pitot and static lines of an aircraft for purging same incident to the endwise movement of a normally retracted plunger which comprises the valving member of the

A spool valve includes a disposable, replaceable cylinder containing gaseous media under pressure which is selectively introduced into the pitot and static lines of an aircraft for purging same incident to the endwise movement of a normally retracted plunger which comprises the valving member of the valve. The plunger, when in an inoperative position, maintains certain instruments in open communication with the pitot tube and outside static lines of an aircraft. When the plunger is advanced to an operative position, the aforesaid connections between the instruments, pitot tube, and outside static lines are closed, whereupon the gaseous media under pressure is introduced into the lines leading to the pitot tube and outside static air line for thereby purging said lines, and simultaneously therewith the instruments are automatically connected to an auxiliary pitot tube and auxiliary outside static lines. If the gas thus introduced under pressure fails to completely purge the lines, the plunger is adapted to be maintained in its fully advanced position by a continuously energized solenoid for enabling the pilot of the aircraft to utilize the auxiliary equipment.

대표청구항 ▼

A device for purging the pitot and/or pitot-static tubes of an aircraft with pressurized gaseous media which comprises: a spool valve which includes an elongate valve body having an axial bore therethrough and having a forward and a rear end; a valving spool reciprocably mounted within the axial bor

A device for purging the pitot and/or pitot-static tubes of an aircraft with pressurized gaseous media which comprises: a spool valve which includes an elongate valve body having an axial bore therethrough and having a forward and a rear end; a valving spool reciprocably mounted within the axial bore of the valve body for movement between fully retracted and advanced positions, the forward end of said spool terminating in a hollow piercing-tip, said spool having an elongate hollow tubular forward portion and a cylindrical rearward portion; a housing for the reception of a disposable gas cylinder removably secured to the forward end of the valve body and in open communication with the forward end of the axial bore thereof; means secured to and carried by the rear end of the valve body for selectively advancing the valving spool from a fully retracted to a fully advanced position within the axial bore of said valve body; said valving spool including at least one through-passageway for placing a pitot tube in open communication with a recording instrument when said valve spool is in a fully retracted position and for terminating the open communication between said pitot tube and recording instrument when the spool valve is in a fully advanced position; and means in said valve spool establishing communication between the interior of the hollow tubular portion of the valving spool and the pitot tube only when the valving spool has been moved to its fully advanced position.