GB1004565A - Improvements in or relating to fluid-controlling valves - Google Patents

Abstract

1,004,565. Valves. AUDCO Ltd. May 10, 1963 [April 13, 1962], No. 14328/62. Heading F2V. A rotary tapered plug valve is provided with means for feeding lubricant to urge the plug towards the larger end of its seating and means for feeding lubricant to parts of the interengaging surfaces of the plug and seat which are on the downstream side when the valve is closed. In the embodiment shown in Fig. 3, lubricant is fed through a passageway 14 in the spindle and through a passage 17 to a chamber 16 to urge the plug 10 against a spring 9. Lubricant is also fed to radial passages 18 containing non-return valves 19 and, when the valve is closed, lubricant flows past the valve on the downstream side to recesses 20 in the housing, through grooves 21 to recesses 22 and to groove 23 thereby lubricating the surfaces. The grooves 23 are separated by portions 24 which prevent communication between the grooves except when the valve is in the open position. Leakage of fluid on the upstream side acts on the associated non-return valve 19 to prevent flow of lubricant. Nipples 25 may be provided to supply lubricant to the interengaging surfaces. In a modification the non-return valves 18 act in the opposite direction providing the lubricant supply to the chamber 16 from the nipples 25 thus dispensing with the supply in the spindle. In a further modification, Fig. 6, the lubricant is controlled by a valve 33 which is subjected to upstream and downstream pressures through conduits 34, 35. As shown the passage 36 is the upstream side and the valve 33 has been moved to the right to permit flow of lubricant through conduit 38 to supply the interengaging surfaces on the downstream side when the valve is closed. In a further modification the valve 33 is located in the valve plug 10 and controls the lubricant fed from the spindle.