Fluid control gate valves

摘要

1,120,234. Valves. ACF INDUSTRIES Inc. 15 Dec., 1965 [25 Jan., 1965], No. 53191/65. HeadingF2V. A gate valve has a body 12 with inlet and outlet tubes 18, 20 between the adjacent edges of which is welded a seat box 26 formed by a pair of rectangular elements 28, 30 each including a stop to limit transverse movement of the gate; each element houses a movable seat 40, 42; the tubes 18, 20 are somewhat flexible to accommodate movement of the fluid carrying pipes but the seat box 28 is substantially rigid to avoid impairing the efficiency of the gate, and the body 12 is made up of thin flexible upper and lower tubular shells 54, 56 which are welded together and to the tubes 18, 20. The lower shell is closed by a member 58 embodying a drain part fitting 62. The upper shell is closed by a bonnet 68 including an adjustable gate stem packing 90, the stem passing through a gate sleeve 96 to a handactuated gear-drive or a power device. Lubricant is supplied to each sealing face of the gate via a check valve and pipes and passages in each element 28, 30 and seat.