PASSIVE SERVO FILTER FOR PNEUMATIC VALVE WITH TRANSVERSE ACTUATOR

摘要

A bleed assembly includes a bleed valve disposed across a bleed duct. The bleed valve includes a valve housing, a shaft connecting an actuator assembly to a flow control member, and a servo tube. The actuator assembly includes a linear actuator disposed perpendicular to a valve centerline, so that linear motion of the actuator is transverse to a valve centerline. The member is in the main fluid passage, rotatable between a fully closed position defined by leading and trailing edges abutting one or more housing walls, and a fully open position defined by the leading edge at the upstream side and the trailing edge at the downstream side of the main flow passage. A first portion of a servo tube extends into the main passage from a distance P1 upstream of the member in a fully closed position, and angular distance A1 of at least 10° from the TDC position.

主权项

1. A bleed assembly comprising:
a bleed duct providing communication between a compressor and a manifold; and a bleed valve disposed across the bleed duct, the bleed valve comprising:
a valve housing including at least one wall defining a main fluid passage having an upstream side and a downstream side, a top dead center (TDC) position, and a bottom dead center (BDC) position;an actuator assembly disposed in an actuator chamber, the actuator assembly including a linear actuator disposed perpendicular to the main fluid passage centerline, so that linear motion of the actuator is transverse to a valve centerline;a flow control member separating the upstream side from the downstream side of the main fluid passage, the member including a leading edge, a trailing edge, an upstream face and a downstream face, the member rotatable in the main fluid passage between a fully closed position defined by the leading and trailing edges abutting the one or more walls, and a fully open position defined by the member having the leading edge at the upstream side and the trailing edge at the downstream side of the main flow passage;a shaft connecting the flow control member to the actuator assembly; anda servo tube including a first portion extending from a port formed through the at least one wall, the port disposed a distance P1 upstream of the member when the member is in a fully closed position, and an angular distance A1 of from the TDC position;wherein the angular distance A1 is at least 10° as measured in a direction around the main fluid passage toward the trailing edge of the member when the member is fully closed, and the distance P1 is equal to or greater than at least 60% of a passage diameter D1.