Patent GB-709724-A (GB)
Title: Improvements in or relating to acceleration-sensitive liquid flow systems
Inventor: COOK HENRY
IPC: F02C7/228
Filed: 1951-04-05
Abstract: 709,724. Gas turbine plant. ROLLS-ROYCE, Ltd. March 31, 1952 [April 5, 1951], No. 7976/51. Class 110(3) [Also in Group XI] A gas turbine fuel system having a liquid fuel supply manifold connected by a plurality of fuel conduits to injectors located at different, positions so that a pressure difference between them is caused by gravity or an acceleration. has a valve comprising a weight in a valve body arranged to oppose the flow in each conduit which valves are arranged so that the loads, on the valves are individually varied during acceleration to compensate for the differences in the liquid heads due to acceleration. The fuel is supplied to the injectors 12 of a gas turbine, plant from a manifold 13 through supply pipes 14a ... 14h. Due to the difference in level of the injectors 12, the pressure in the pipes 14a ... 14h will differ, being lowest in the pipe 14a and highest in the pipe 14e. To compensate for this pressure difference each of the unions 15a ... 15h is provided with a valve to oppose the flow through the pipes 14a ... 14h. Each union consists of a body 15, Fig. 2, in which the inlet duct is connected to the outlet socket 21c through a cylindrical, chamber 21a. A cylindrical weight 22 slides in the chamber 21a and restricts the inlet port. Slots 23 form a fuel passage to the outlet socket 21c when the port 20 is open. When it is desired to compensate for differences in pressure due to vertical acceleration the chamber 21a is vertical. The mass of the weight 22 or the effective area of the ports 20 or both may be varied to compensate for the differences in pressure. When it is desired to have compensation for positive and negative accelerations, two valves may be employed. The first valve is arranged as described. The outlet of this valve is connected to the inlet of a second similar type of valve, the direction of flow through this valve being opposite to that of the first valve. When one valve is operative, the other is inoperative and has means for passing fuel from, or to, the operative valve. In a modification, the two valves are arranged in parallel. In this arrangement, the valves are arranged to shut off their outlet ports when they are inoperative. In a further modification, Fig. 7A. the valve members 41 are loaded on to their seats 40 by springs 42. The mass of the valve members and the spring loadings are equal for the various inectors but the valve members are arranged to move in the radial direction. The mass of the valve members are chosen so as to be equivalent to the pressure due to a head of fuel equal to the radius. The differences in the direction of action of the springs 42 and gravity on the mass of the valve 41 automatically compensates for pressure differences due to different heads of fuel: In a modification of this arrangement, a single union is used to feed two injectors. An arraneement for compensating for positive and negative accelerations in which the two valves are.arranged in parallel and operated by a single valve member having two cylindrical portions, one in each valve, is also described.