Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2000-04-20
2001-08-14
Lee, Kevin (Department: 3754)
Fluid handling
Systems
Multi-way valve unit
C251S029000, C251S031000, C251S025000, C244S13500B
Reexamination Certificate
active
06273135
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the control of a high pressure flow of fuel to combustion equipment.
BACKGROUND OF THE INVENTION
When fuel is burned to create an expanding gas, and the forces generated thereby are utilised to rotate a turbine, or to drive a piston, which in turn rotates a crankshaft, a situation called overspeed can develop. It is then necessary to obviate the flow of fuel to the combustion zone as quickly as possible, so as to avoid mechanical damage to the associated powerplant. This means that it is desirable to provide fuel shut off capability which will satisfy both normal and abnormal running speeds of the apparatus being driven.
It is known, to take a plurality of tappings from the high pressure fuel system, and provide each tapping with an outlet and a dedicated blocking device, with which to selectively block the outlet as and when appropriate. This is in order to achieve the fuel flow control as described hereinbefore, so as to protect the associated driven apparatus. It is an object of the present invention to provide an improved fuel flow control apparatus.
SUMMARY OF THE INVENTION
According to the present invention, in a main, high pressure fuel system including fuel flow cut off means, wherein fuel flows tapped from said system are connected to said cut off means and utilised to apply differing main flow cut off rates by said cut off means, a single, tapped fuel flow blocking device positioned between tapped flow outlets and selectively movable to block one or other of said outlets, the arrangement being such that blocking of one said outlet effects a low pressure fuel flow to said main fuel flow cut off means to move it into the high pressure fuel line to close it, and blocking of said other outlet effects a high pressure fuel flow to said fuel cut off means, to move it more rapidly into said high pressure fuel line than said low pressure fuel flow, to close it.
REFERENCES:
patent: 4265272 (1981-05-01), Klimowicz et al.
patent: 5427350 (1995-06-01), Rinkewich
patent: 2256729 (1992-12-01), None
Lee Kevin
Manelli Denison & Selter PLLC
Rolls-Royce plc
Taltavull W. Warren
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