Improvements in and relating to flow control valves

摘要

917,423. Valves. FISHER GOVERNOR CO. Aug. 4, 1959 [Aug. 4, 1958], No. 26644/59. Class 135. A flow-control valve comprises a resilient sleeve 56 urged by a controlling fluid pressure on to a grid having two sets of ports 78 through which the controlled flow occurs, the two sets of ports being in sealed connection with each other by means of the sleeve and control of the flow taking place by regulating the controlling pressure to counteract the lifting of the sleeve away from the grid due to the pressure of the flowing material, the grid comprising a stack of plates having notches 68 and apertures 66, the plates being orientated relative to each other to define axial flow passages 74, 76 communicating with the ports through axiallyspaced flow slots defined by the notches so that the ports-cum-flow slots are circumferentially and axially spaced from each other, some of the axial passages being connected to an inlet duct 16 for the flowing material and others to an outlet duct 18. The resilient sleeve 56 is stretched over the grid and provided with flanges 58, 59 sealingly clamped between a cover 36 and a base-plate 28; the cover is formed with a recess which provides a chamber 60 communicating with downstream pressure. In operation, pressurized fluid passes from the inlet 16 through spaced ports 30 in the plate 28 into the axial flow passage 74 and out of the flow slots 62 thereby expanding the sleeve against the fluid-loading pressure in the chamber 60, the fluid then flowing through the slots 62 above the barrier 72 into the outlet 18 via the axial-flow passage 76. The valve may be used in the reverse direction.