Patent GB-813437-A (GB)
Title: Improvements in or relating to fluid control valves
IPC: F16K3/18
Filed: 1956-04-30
Abstract: 813,437. Valves. CONSOLIDATED ELECTRODYNA.MICS CORPORATION. April 30, 1956 [April 28, 1955], No. 13198/56. Class 135. In gate valve the closure member is movable transversely of the axis of the valve seat and is movable downwardly and upwardly for sealing and unsealing the valve seat. The valve comprises a body 10, Fig. 1, the top and bottom ribbed plates 14 and 16 of which are reinforced by sections 22, 20, Fig. 2, which are secured to conduits 58, 42, respectively. A substantially square plate 64 is connected by a universal joint to the rod 122 of a piston 124 located in a cylinder 126. The plate 64 is thus horizontally movable within the valve body and is guided by corner rollers which move in guides 66. The plate 64 has at its centre a circular opening 74 and a circular dish-shaped cover-plate 76 is secured to its upper surface. A flexible line 86 is connected between a nipple 87, Fig. 1, on a side plate of the valve body and a conduit 84 in the cover-plate 76. A circular closure disc 88, Fig. 2, is attached by a bellows 90 to the plate 64 and has welded thereto a circular collar 107 which is a close-sliding fit in the opening 74 and has a plurality of holes 108. A leaf-spring 110 is fixed at its centre to the closure disc 88 and its ends engage diametrically-opposed notches in the collar 107. With the valve in the closed position, Fig. 2, the conduit 58 may be evacuated by connecting a conduit 142, Fig. 1, to a vacuum system. The valve operating  circuit includes a solenoid operated three-way valve 160, Fig. 5, which connects the flexible line 86 to a vacuum pump or to a line 158 including a solenoid-operated valve 157, a relief valve 156 and a reducing valve 151 which is connected by a line 152 to a supply line 149 which can be connected via one or other of the solenoid-operated valves 148, 150 to opposite ends of the cylinder 126. The arrangement, Figs. 5 and 6, is such that with the valve in the closed position the solenoids 148A, 150A, 160A of the valves 148, 150, 160 are de-energized and the solenoid 157A of the valve 157 is energized so that operation of the switch 166 causes energization of the solenoid 160A of the valve 160. The line 86 is thereby connected to a vacuum pump and the pressure in the bellows 90 is reduced. The spring 110 raises the disc 88, Fig. 2, from the seat 36. At a predetermined bellows pressure level a switch 162, Fig. 6, closes to energize the solenoids 148A, 150A, Fig. 5, of the valves 148, 150 so that the piston 124 is moved to the left to withdraw the plate 64 and the closure member 88 to the left, Fig. 2, so causing a switch L to open and the valve 157 to close. A switch may be actuated to to give an indication that the valve is fully open. To close the valve the switch 166 is again actuated to de-energize the solenoids 148A, 150A, 160A of the valves 148, 150, 160, Figs. 5 and 6, so that the piston 124 is moved to the right to place the closure member 88 above the seat 36, Fig. 2. The limit switch L is closed so that the valve 157 is operated to permit air to expand the bellows 90 and seat the closure member.