Patent ID: 6745557
Filing Date: 2004-06-08
Classification: F02C,F16K

Abstract:
An hydraulic valve arrangement arranged to control the rate of flow of fuel to a gas turbine engine comprising: a fluid pressure actuable valve which is actuable between a first position in which fluid flow through the fluid pressure actuable valve is prevented and a second position in which fluid flow through the fluid pressure actuable valve is permitted at a first rate; and a second valve which is actuable between an open state, in which there is flow of fluid through the second valve at a second rate, and a closed state in which there is no flow through the second valve; the fluid pressure actuable valve being arranged such that, upon initial actuation of the second valve to its open state, the fluid pressure actuable valve is caused to move into the second position; and whereby the fluid pressure actuable valve remains in the second position upon subsequent switching of the second valve between the open and closed states, thereby to permit the rate of flow of fuel through the hydraulic valve arrangement to be varied by switching of the second valve.