FIELD: oil and gas industry.
SUBSTANCE: invention relates to equipment for oil industry, namely to equipment used when installing gate valves and shutoff devices on pipeline operating under pressure without its stopping. Device for screwing and unscrewing the plug comprises handle (1), seal (18), threaded rod (2), gate valve (22), flange (19) with internal tapered thread (20), neodymium magnets (16), plug (17), pressure relief valve (11). On the device there installed is a mechanism for rotation of a threaded rod, which includes handwheel (3), bronze bushing (5), packing bushing (6), nut (4), upper bushing (7), mechanism for rotation of the plug, including cup (12), tip (13), spring (14), pin (15), seal (18) installed on the plug.
EFFECT: possibility to perform works on installation and dismantling of shutoff devices on pipeline operating under pressure without its stop.
1 cl, 2 dwg
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