GB615919A - Improvements in or relating to fluid flow proportioning valves - Google Patents

Abstract

615,919. Fluid-actuated valves. BENDIX AVIATION CORPORATION. April 16,1946, No. 11716. Convention date, April 23, 1945. [Class 135] Apparatus for dividing a fluid stream into two, e.g. equal, streams or uniting two streams equally comprises a valve body 10, Fig. 2, having a main line 55 communicating through ports 74, 75, Figs. 3, 5, in a spring-loaded sleeve 58 and ducts 70, 71 with the ends 72, 73 of a cylinder 14 having a piston 15 formed with pairs of grooves 22, 23 and 24, 25 coacting respectively with grooves 16, 17 in the cylinder wall which are in open communication with branch lines 20, 21, Fig. 4. The ports 74, 75 in the sleeve 58 are controlled by a spring- loaded piston 63, the position of which depends upon the pressure in the line 55, and flow from the cylinder ends to the grooves 16, 17 is controlled by spring-loaded check valves 39, Fig. 5, and 49, Fig. 4, and in the reverse direction by check valves 27, 42. Leakage of fluid between the grooves 16 and 17 past the piston 15 is prevented by the fluid pressure in grooves 78, 79 communicating through bores 44, 31 respectively with the cylinder spaces 72, 73. When the apparatus functions to divide into equal parts a fluid stream entering the line 55, the pressure of the fluid presses back the piston 63, Fig. 3, to open the ports 74, 75 through which the fluid flows to the cylinder spaces 72, 73 and thence past the valves 39, 49 and the spaces 22a, Fig. 5, and 25a, Fig. 4, to the grooves 16, 17 and the branch lines 20, 21. If, e.g. the flow through the line 21 becomes too great, the pressure in the cylinder space 73 falls and the piston 15 moves to the right, thus increasing the space 22a and the flow through the groove 16 to the line 20, and reducing the space 25a and the flow through the groove 17 to the line 21. When the apparatus functions to unite the flows entering the valve body through the lines 20, 21, the fluid from these lines flows from the grooves 16, 17 into the grooves 23, 24 and thence past the valves 27, Fig. 4, and 42, Fig. 5, into the spaces 72, 73, and then via the ducts 70, 71 and the ports 74, 75 to the line 55. Differences in flow result in corresponding differences in the pressures in the spaces 72, 73 and movement of the piston to equalize the flow. The valve may be modified to produce unequal flows by making the ports 74, 75 of unequal size, forming the piston 15 with ends of unequal area, or loading one end of the piston by a light spring. Specification 599,012 is referred to.