Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1991-09-26
1992-12-29
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 33, 251 63, 417 27, F16K 31122
Patent
active
051745453
ABSTRACT:
A bleed valve (20) includes a reciprocating sliding element (42) with a circular head (48) joined to an annular wall (50). An annular first chamber (52) defined by the wall (50), the head (48), and the central support (30) has a variable volume dependent upon the relative position of the sliding element (42). The valve (20) includes a housing (22) having a base (26) with first and second annular partitions (62,64) protruding from the base (26). An annular second chamber (66) is defined by the first partition (62), the platform (34) of the central support (30), the second partition (64), and the base (26). An opening (72) in the central support (30) connects the second chamber (66) in fluid communication to the first chamber (52). Control air supplied from an engine source flows through a first bore (78) into the second chamber (66) which is vented to ambient via a second bore (80). The first and second bores (78,80) have a primary and secondary metering orifice (84,86).
REFERENCES:
patent: 2147722 (1939-02-01), Stern
patent: 3022040 (1962-03-01), Miller
patent: 3026896 (1962-03-01), Bosworth
patent: 3071345 (1963-01-01), Glenn et al.
patent: 3265350 (1966-08-01), Yount et al.
patent: 3915587 (1975-10-01), Rannenberg
patent: 4574585 (1986-03-01), Conn
patent: 4590754 (1986-05-01), Blizzard
Michalsky Gerald A.
Pratt & Whitney Canada Inc.
Snyder Troxell K.
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