Patent ID: 9428278
Filing Date: 2016-08-30
CPC Classification: B64D,F02C,Y10T

Claim Text:
1. A motive flow valve for a fuel circuit of an aircraft engine, comprising: a shaft comprising a low-pressure chamber, a high-pressure chamber, a fuel inlet and a fuel outlet, a drawer extending inside the shaft between the high-pressure chamber and the low-pressure chamber, the drawer being configured to be displaced with respect to the shaft under the effect of a difference in pressure between the high-pressure chamber and the low-pressure chamber, between a closed position wherein the drawer obstructs the fuel inlet, and an open position wherein the drawer releases the fuel inlet in such a way as to allow for a flow of fuel from the fuel inlet to the fuel outlet, wherein the shaft comprises a shoulder arranged between the fuel inlet and the fuel outlet, defining an abutment surface with which the drawer abuts in the closed position, and a first sealing element interposed between the abutment surface and the drawer in the closed position, in such a way as to limit a fuel leak between the fuel inlet and the fuel outlet in the closed position, wherein the drawer comprises a portion extending in an intermediate chamber located between the high-pressure chamber and the low-pressure chamber, the drawer further comprising a channel exiting on the one hand in a first part of the intermediate chamber located on a first side of the portion of the drawer and communicating with the fuel outlet in the open and closed positions, and on the other hand in a second part of the intermediate chamber located on a second side of the portion of the drawer, opposite the first side, that only communicates with the fuel inlet or with the fuel outlet via the channel in the open and closed positions, in such a way as to balance a pressure of the fuel of each side of the portion of the drawer in the intermediate chamber.