Abstract
Today, a large number of direct-flow gate valves with a single slide plate are used in the petroleum industry, and, in particular, for oil and gas recovery. Moreover, the service life of well-head equipment in Russia may attain many tens of years. In this respect, modernization of these gate valves for the purpose of extending their service life and lengthen their inter-repair period is urgent. The tendency currently exists to broaden use of gate valves with a stationary spindle; however, the assigned running time to loss of serviceability of the sliding couple is not always realized. The following modernized gate valve has been designed: with an extensible spindle, and with no opposing rod; and, a special mechanical drive is developed. The gate valve developed permits a significant increase in running time to failure of the gate and packing gland; an appreciable reduction in the control force; and, retention of ease of use at the series-production level. Modernization of the gate valve makes it possible to extend the inter-repair interval and running time to failure, and reduce the control force.
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