FIELD: space engineering. SUBSTANCE: device includes mains for feeding propellant from propellant tanks to control rocket engines; mains are provided with valves and check necks. Each check neck is provided with coupling pipe union and locking unit fitted on it. Locking unit is made in form of threaded rod provided with valve articulated on it and hollow head having longitudinal slots for wrench and circular groove communicated via through holes with cavity of check neck. Through holes are made in hollow head of rod. Each check neck is provided with seats for valves at areas of coupling with mains. Connecting pipe unions of check necks are interconnected by means of bypass pipe lines fitted with valves. EFFECT: enhanced survivability and reliability of power plant due to disconnection of defective sections of feed mains during operation in Earth orbit. 2 dwg
