Rotary kinetic fluid motors or pumps – Working fluid bypass – Selectively adjustable vane or working fluid control for bypass
Reexamination Certificate
2009-02-04
2011-12-06
Nguyen, Thinh T (Department: 2818)
Rotary kinetic fluid motors or pumps
Working fluid bypass
Selectively adjustable vane or working fluid control for bypass
C415S146000, C415S147000, C415S043000, C137S810000, C137S811000
Reexamination Certificate
active
08070424
ABSTRACT:
Provision of flow control arrangements which can be switched from high flow restriction to low flow restriction or vice versa are desirable. It is known to use switched vortex valves comprising a vortex chamber having a diverter portion which jets a through flow into either radial presentation to an outlet or tangential presentation with differential flow restrictions. Typically deflection is through cross flows presented from control ports as determined by mechanically actuated and controlled valves. Sensors are required to determine pressure differentials in order to actuate these moving part valves. By providing association between the control ports and an outlet path along with appropriate configuration and sizing of the flow regulators switching states can be provided through the cross flows presented via the flow regulators between the high and low through flow restriction. The flow regulators generally comprise orifice restrictors, diffusers/venturi arrangements or vortex throttles.
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European Search Report dated Jun. 29, 2010 for corresponding European Patent Application No. 09 250 278.0.
Priestman Geoffrey H.
Scanlon Timothy J.
Tippetts John R.
Wilson Paul
Nguyen Thinh T
Oliff & Berridg,e PLC
Rolls-Royce PLC
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