Gas turbine engine dump valve
First Claim
1. A fuel system for a gas turbine engine comprising a fuel supply, fuel metering means, pump means connecting said supply to said metering means, a fuel supply valve including an inlet port and an outlet port, said valve operable to selectively open or close communication between said inlet and outlet ports, a nozzle for introducing fuel to a combustion chamber, a fuel line connecting said metering means to said inlet port, a second fuel line connecting said outlet port to said nozzle, and a dump valve, said dump valve comprising a body having drain, inlet, and pilot ports and a valve seat circumscribing an opening communicating said inlet and drain ports of said dump valve, a spool slidably mounted in said body and having a valve tip engagable with said seat, means spring loading said spool to normally resiliently engage said tip with said seat, means communicating said inlet and pilot ports of said dump valve with said first and second opposed faces of said spool to expose same to pressures at said inlet and pilot ports of said dump valve, said first face being disposed such that force due to pressure acting thereon is directed to aid the force of the spring loading means, said second face being disposed such that force due to pressure acting thereon is directed to oppose the force of said spring loading means, and means connecting said pilot and inlet ports of said dump valve to said inlet and outlet ports of said supply valve.
1 Assignment
0 Petitions
Accused Products
Abstract
A valve actuated in response to a drop in fuel pressure across a fuel supply valve that will drain the fuel from a fuel line but not leak when exposed to high fuel pressures during normal operation. The dump valve is particularly applicable to the draining of fuel from a gas turbine engine fuel nozzle line after shutoff of the engine fuel supply valve.
18 Citations
11 Claims
- 1. A fuel system for a gas turbine engine comprising a fuel supply, fuel metering means, pump means connecting said supply to said metering means, a fuel supply valve including an inlet port and an outlet port, said valve operable to selectively open or close communication between said inlet and outlet ports, a nozzle for introducing fuel to a combustion chamber, a fuel line connecting said metering means to said inlet port, a second fuel line connecting said outlet port to said nozzle, and a dump valve, said dump valve comprising a body having drain, inlet, and pilot ports and a valve seat circumscribing an opening communicating said inlet and drain ports of said dump valve, a spool slidably mounted in said body and having a valve tip engagable with said seat, means spring loading said spool to normally resiliently engage said tip with said seat, means communicating said inlet and pilot ports of said dump valve with said first and second opposed faces of said spool to expose same to pressures at said inlet and pilot ports of said dump valve, said first face being disposed such that force due to pressure acting thereon is directed to aid the force of the spring loading means, said second face being disposed such that force due to pressure acting thereon is directed to oppose the force of said spring loading means, and means connecting said pilot and inlet ports of said dump valve to said inlet and outlet ports of said supply valve.
Specification