GB834574A - Valve - Google Patents

Abstract

834,574. Valves. INTERNATIONAL BASIC ECONOMY CORPORATION. July 6, 1956, No. 21018/56. Class 135. A fluid-actuated two-, three-, or four-way valve has a valve member 36, with coned seats 30, 40 for engagement, e.g. with fixed seatings 32, 38, controlling communication between an inlet 18 and two outlets 20, 22 in the case of a three-way valve, and the valve-member 36 is carried on a stem 34 which projects outside the valve housing through a packed gland 44 and guide-plate 58, to be connected to a diaphragmactuated piston 68 through a self-aligning extension comprising a rod 74 screwed to an adaptor 94, which latter has a ball-and-socket connection 95 with the piston 68, relative rotation therebetween being prevented by ribs 98 on the ball engaging grooves in the socket. Such ribbed connection permits the adaptor 94 and piston 68 to be screwed as an assembly on to the rod 74 after the latter has been attached to the valve stem 34 by a further ball-and-socket connection 79, the screw connection being then locked by a nut 100, reached through a screw-plugged hole 104 in the piston 68. Fluid pressure applied at 72 to a diaphragm 64 depresses the valve 36 on to the lower seating 32, in opposition to a helical spring 59 surrounding the extension 94, and raising the valve on to its upper seating 38. The lower valve seating 32 is attached to the housing by a screwed flanged ring C, which applied pressure to lapped sealing faces 109 which prevent access to the screw thread of any solidified chemical material which may accumulate in a cylindrical clearance 108 which is made too wide to be bridged by such material which cannot therefore interfere with removal of either the screwed ring or the seating.