Patent GB-905754-A (GB)
Title: Fuel selector and flow divider valve for a jet propulsion engine afterburner
Inventor: RUSSELL JOHN GAETAN
IPC: F02C7/228
Filed: 1960-07-21
Abstract: 905,754. Valves. PARKER HANNIFIN CORPORATION. July 21, 1960, No. 25388/60. Class 135. [Also in Group XXVI] A flow divider valve, for controlling the flow of fuel to various sections of a jet propulsion engine afterburner manifold, limits the fuel flow to certain of the manifold sections after which ,a closed portion of the valve is opened to direct fuel to the others of the manifold sections. A squirt system is provided for rapidly delivering a limited quantity of high pressure fuel to the closed portion of the valve and associated manifold sections so that when the closed portion of the valve is opened a minimum pressure crop occurs. Control means is also provided for first operating the squirt system, then opening the closed valve portion for the normal flow of fuel and finally immediately rendering the squirt system inoperative. The flow divider valve, Fig. 2, is provided with a main fuel inlet 32 connected to the outlet of the afterburner fuel control, a squirt inlet 33 connected to the discharge of the afterburner fuel supply pump, a signal inlet 79 connected to the afterburner fuel control unit and an outlet 80 connected to the suction of the main fuel supply pump. The afterburner fuel control unit is connected to the main throttle lever and is actuated when the throttle lever has passed through an angle of 78 degrees to allow fuel to pass to the inlet 32. When the fuel pressure reaches 61 p.s.i. the valve unit 52 opens and allows fuel to flow to some of the sections of the afterburner. On further opening of the throttle the fuel pressure increases until at 125 p.s.i. the valve unit 53 opens against the action of springs 65 and 95 to supply fuel to further sections of the afterburner. Fuel is prevented, however, from entering the passage 50 by the valve 51. When the throttle valve reaches the 98 degree position, a fluid signal pressure of 765 to 785 p.s.i. is applied to the inlet 79. This causes the valve 85 to move to the right and close the passage 82 leading to the outlet 80. Fluid is then delivered to the cylinder 90 to move piston 96 to the right. The piston 96 moves the fitting 94 away from the head 93 of rod 66 so that the valve 53 is only acted upon by the spring 65. The opening pressure of the valve 53 is then reduced to 91 p.s.i. At the time the signal pressure is applied, the passage 50 and the lines and manifolds connected to it will contain no fuel. The signal pressure is also applied to the cylinders 101 and 113 containing spring- loaded pistons 107, 118. The spring 121 is stronger than the springs 109, 120 and the spring 109 stronger than the spring 120 so that the spring 120 will start collapsing first to allow piston 118 to move to the left to unseat the valve member 134. Further movement of the piston 118 causes a locking ring on the actuator rod 116 to unseat the valve member 131. As a result fuel within the valve member 129 flows into the passage 50 and the pressure drop across the valve member causes it to open so that squirt fuel may be fed from inlet 33 to passage 50 and associated manifolds. As the piston 118 and actuator rod 116 moves further to the left, the retaining sleeve 143 engages the guide 117 and is moved against the action of the spring 148. This allows the opening 145 to be aligned with the balls 141 so that the balls ride up the shoulder 140 and the valve member 134 is released from the actuator rod and is forced to the closed position by a spring 146. The squirt fuel is then shut off. When the actuator rod 116 is moved to the right the balls 141 will drop into place as shown and the sleeve 143 returned to its original position. After the spring 120 is prevented from further collapse by the stop member 119 bottoming, the spring 109 starts to collapse so that piston 107 moves to the left. This causes port 110 to be opened and the fuel inside the valve member 103 to flow into the passage 50. The resulting pressure drop opens the valve 103 and allows the normal fuel to flow to the passage 50. This is followed by the collapsing of the spring 121 until piston 118 has bottomed on the stop member 119 at which time the balls 141 enter the recess 145 in the sleeve 143 and disengage the valve member 134 from the actuator rod 116. Once the squirt valve 115 has functioned no further fuel can be introduced through it until the throttle has been moved below the 98 degree position and moved forwards again. The valves 54, 55 are operated at 61 p.s.i. and 97 p.s.i. respectively.