System for controlling a pneumatic valve of a turbine engine

Abstract

A system ( 110 ) for controlling a pneumatic valve ( 112 ) of a turbine engine, such as a bleed valve, the system comprising a directional control valve ( 140 ) for controlling air under pressure connected between the valve ( 112 ) that is to be controlled, a controlling solenoid valve ( 118 ), and means ( 144 ) for taking off air at a pressure P 1 , the solenoid valve also including a first inlet ( 132 ) connected to a source of fluid at a pressure P 2 that is independent of P 1 , the opening and closing of the pneumatic valve being controlled by a flow of the air at pressure P 1 delivered by the directional control valve that is controlled by the fluid at pressure P 2 delivered by the solenoid valve.

1 . A system for controlling a pneumatic valve in a turbine engine, comprising a controlling solenoid valve and means for feeding fluid at a pressure P 2 , wherein the system further includes a directional control valve for fluid at a pressure P 1  that is connected to the bleed valve, to the solenoid valve, and to means for taking off air at the pressure P 1  from the turbine engine in order to control said bleed valve, opening and closing of the bleed valve being controlled by the air at the pressure P 1  delivered by the directional control valve that is itself controlled by a flow of fluid at the pressure P 2  delivered by the solenoid valve, the pressure P 1  being independent of the pressure P 2 . 
     
     
         2 . A system according to  claim 1 , wherein the directional control valve is pneumatically or hydraulically controlled by the solenoid valve. 
     
     
         3 . A system according to  claim 1 , wherein the solenoid valve is connected to a fuel circuit or to means for taking off air from the turbine engine for the purpose of delivering its control action. 
     
     
         4 . A system according to  claim 1 , wherein the solenoid valve is of the type having three fluid inlet/outlet ports connected respectively to the bleed valve that is to be controlled, to the solenoid valve, and to the ambient atmosphere, and includes a movable member that is movable between two positions in which the bleed valve that is to be controlled is connected respectively to the means for taking off air at the pressure P 1 , and to the ambient atmosphere, with the movement of the movable member being controlled by the fluid under pressure delivered by the solenoid valve. 
     
     
         5 . A system according to  claim 1 , wherein the solenoid valve has two inlets for connecting respectively to a source of fluid under pressure and to the ambient atmosphere, and an outlet connected to a port of the directional control valve. 
     
     
         6 . A system according to  claim 1 , wherein an inlet of the solenoid valve is for connecting to means for taking off air at a pressure P 2  from the turbine engine, the pressure P 2  being less than the pressure P 1 . 
     
     
         7 . A system according to  claim 1 , wherein the solenoid valve has two chambers, one of which is for feeding a port of the directional control valve with fluid under pressure, and the other of which is for connecting said port to the ambient atmosphere. 
     
     
         8 . A turbine engine, comprising an engine surrounded by a nacelle and including at least one pneumatic valve, wherein said at least one pneumatic valve is controlled by a system according to  claim 1 . 
     
     
         9 . A turbine engine according to  claim 8 , wherein the directional control valve is situated in the engine close to the bleed valve or in the nacelle close to the solenoid valve.