Patent GB-1275553-A (GB)
Title: Fluid flow regulating valve
Inventor: ANTHONY JOHN FRANCIS
IPC: F16K7/18
Filed: 1968-06-21
Abstract: 1275553 Valves J F A MEYER 18 June 1969 [21 June 1968] 29595/68 Heading F2V A fluid flow regulating valve comprises a fluid passage, a perforated partition which extends across the passage, a valve member in the form of a flexible sheet and means for progressively laying the valve member against the partition to close the valve and for progressively peeling the valve member away from the partition to open the valve said means being secured to the valve member at a first location on its edge, the valve member being held against the partition of a location on its edge opposite the said first location, said means comprising a shaft which extends through a bore in the valve body and is rotatable therein, a linkage which connects the shaft to the valve member at the first location, and control means for rotating the shaft. In the embodiment shown, the partition 1, perforated by slots 9 alternating with bars 13, is clamped between body parts 2, 3 forming the fluid passage. The body is adapted for clamping between upstream and downstream pipe flanges 5, 7 respectively. The partition may be smoothly finished on both sides and serve as a reversible seat. The flexible sheet 11, e.g. of stainless or carbon steel or plastics, is connected at opposite sides to arcuate arms 37 pivotally connected at their ends to levers 32. These levers are operated in unison through a pair of connecting bars 42 and meshing gear sectors 31, from a single operating handle 30. Connected to the four pivots 35 are cam followers 36 which co-operate with fixed cams 21. During the opening movement, as the diametrally opposite halves of the sheet are peeled off the seat toward each other, the cams and followers turn the pivots 35 so that the connecting points 44 of the sheet to the arms 37 rise upwardly to the fully open position shown in dotted line. In another embodiment, Figs. 5 and 6 (not shown), the two support pivots on the side remote from the operating shaft (29) are omitted along with the connecting bars (42). In this case the points (44) are carried cantilever fashion on arms (37). In addition, the cam followers, of which there are now but two, are constituted by pins (56) which are engaged positively in cam tracks (57). Modifications of the partition include composite forms built up of separate bars and spacers with segment shaped side pieces (45, 47) Figs. 3 and 4 (not shown). In a further modification, segment-shaped side pieces (59), Figs. 7 to 10 (not shown), of the seat are split on a plane transverse to the partition and serve to clamp between them diametrically opposite portions (65) of the flexible sheet, so that in open position the halves of the sheet abut closely together. Flexure into closed position is eased by radiused fillets (60) on the side pieces and bars. The seating surface of the partition may be concave, Fig. 12 (not shown). Instead of being peeled from opposite sides, the sheet may be fixed at one side and peeled to lie against the flow passage on that side, Fig. 11 (not shown). In another construction, the sheet is peeled on to a roller (75), Fig. 13 (not shown), constrained to move along the partition by a track (82) and rotated by pinions engaging racks (81).