| 摘要 |
FIELD: construction. ^ SUBSTANCE: valve comprises body with inlet and outlet valves. Inside body there are two locks provided, which are connected to stem. The first lock, stopping one, is arranged in the form of stem with piston with holes, sealing surface. The second lock, stop and control one, is arranged in the form of stepped bushing-plunger that embraces piston with sealing surface, at the same time its external steps are coupled with steps arranged in the body. Bushing-plunger is arranged with different efficient areas of section in ends, as a result of which it may axially move with stem piston, and in body between stages there is channel communicated to atmosphere. Mobility of stepped bushing is limited by extreme positions of displacement (upper and lower ones). Stepped bushing-plunger is installed coaxially in seat with sealing surface and sealing element. Seat is arranged as tubular with holes arranged downstream sealing element and sealing surface along medium flow motion. Stem is arranged with additional piston to create above-piston cavity, which is connected by channel to inlet channel, and under-piston cavity, besides area of above-piston cavity is less than area of under-piston cavity. Under-piston cavity via normally open electromagnet valve is connected to inlet channel and via normally closed electromagnet valve - to outlet channel, in which there is an indicating and alarming manometre installed as connected to both electromagnetic valves. On the side of above-piston cavity there is an electric drive arranged, stem of which is installed with the possibility of interaction with stem. ^ EFFECT: invention makes it possible to execute remote control of transported medium flow, automatic closure of high pressure pipeline in case of emergency pressure drop in it and automatic opening after pressure in pipeline downstream valve exceeds emergency value. ^ 1 dwg |
