FIELD: machine building.
SUBSTANCE: proposed unit comprises two safety valves, four-way feed valves, three full-flow (feed) valves, two changeover valves, high-pressure main lines and low-pressure main line. Third feed valve is connected parallel with sequence first and second full-flow valves. Inlet of four-way full-flow valve is connected to high-pressure main line. First outlet of four-way feed valve is connected to air cylinder of the first changeover device. Second outlet of four-way feed valve is connected to air cylinder of the second changeover device. Third outlet of four-way full-flow valve is connected to low-pressure main line. Low-pressure line is connected in between first and second feed valves. Inlets of thirst feed valve are connected to chambers under safety valves.
EFFECT: possibility of repair and replacement of one safety valve in operation.
4 cl, 2 dwg
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