Improvements in or relating to liquid flow apparatus

摘要

1,077,437. Regulating fluid-flow; fluidpressure servomotor systems. Y. M. PONSAR. May 18, 1966 [May 22, 1965; May 4, 1966], No. 22172/66. Headings G3H and G3P. Apparatus controlling the flow from an upstream liquid level 11 to a downstream liquid level 13 comprises a first gas chamber formed by a bell 16, extending into the downstream level, conduit 18, valve box 17, conduit 20 and a bell 19, which extends into the upstream level 11. The bell 16 has an orifice 22 for the flow of liquid between the levels which flow entrains gas. Gas is supplied through a pipe 26, valve 49 and valve 35 to a pipe 30 which is immersed in the liquid in the bell 19. A pipe 28 leads from the gas supply to a second gas chamber 25 to act on a piston 38 in opposition to the gas pressure in the first chamber acting on a piston face 37 of a valve 25 controlling the flow of air into the first gas chamber. A loading force acts on the piston 38 to oppose opening of the valve and this may be a pressure loading in chamber 41 or a weight connected to the piston by a rope passing over a pulley. With a constant loading on the piston 38, the pressure difference in the gas chambers are maintained constant and the flow of liquid through the orifice 22 is constant. The gas pressure in chamber 41 may be varied to vary the flow rate and this variation may be in response to changes in liquid level N so that the liquid flow is proportional to the level N. Valve 49 may also be controlled in response to liquid level N1 to control the liquid flow.