GB762194A - Improvements in apparatus for feeding liquid fuel to the burners of continuous combustion turbine engines - Google Patents

Abstract

762,194. Gas turbine plant. DOWTY FUEL SYSTEMS, Ltd., and DEAN, J. S. March 3, 1955 [Dec. 7, 1953], No. 33982/53. Class 110 (3). [Also in Group XXIX] In a liquid fuel supply stem for continuous combustion turbine engines in which a throttle valve 10 actuated by a fluid pressure servomechanism is arranged in a by-pass passageway 9 connecting the inlet and output sides of an engine-driven pump 4 of fixed displacement supplying one or more burners 8, a pressure reducing valve 30 is arranged between the pump outlet and the throttle valve and operates to maintain a constant pressure difference across the throttle valve. The throttle valve 10 comprises a slotted valve member 15 controlling an orifice 14 and operated by a piston 17 subject on its upper side to the pressure in the valve inlet chamber 11. The chamber below the piston 17 is connected to the chamber 18 above it through a restriction 20 in a bleed duct 21, the outlet of which is controlled by a fuel control mechanism 6 operated by a hand lever 7. The mechanism 6 controls the fuel flow in the pump delivery line 5 and is provided with a drain duct 22 to return fuel bled from the duct 21 to the inlet of the pump. The pressure reducing valve 30 comprises a casing divided into three chambers 32, 33, 34 by a flexible diaphragm 35 and a partition 36. The last is formed with an orifice 37 controlled by a valve member 38 connected to the diaphragm by a stem 39. The diaphragm is loaded by a spring 40 adjusted by a screw 41. The chambers 33, 34 and the orifice 37 form part of the by-pass passage 9 between the fuel delivery line 5 and the valve inlet chamber 11. The chambers 32, 33 are respectively subject to the pressures on the outlet and inlet sides of the valve 10 so that the valve 30 maintains a constant pressure drop across the valve 10 dependent on the compression of the spring 40.