APPARATUS FOR AUTOMATIC MAINTAINING OF PRESSURE IN CLOSED IRRIGATION MAIN Russian patent published in 2004 - IPC

FIELD: agricultural engineering, may be used in water supply systems and in oil and gas pumping systems.

SUBSTANCE: apparatus has pumping-power unit 1 with control unit 2, suction pipe 3 and blowing pipe 4 connected through bypass pipeline 5 via locking device 6 with hydraulic drive 7, which is divided into upper cavity 8 and lower cavity 9 by piston. Piston is fixed on rod 11 of hydraulic drive 7 controlled by additional electric hydraulic relay 12, whose actuating unit 13 is connected with upper cavity 8 of hydraulic drive 7, and by main electric hydraulic relay 14, whose actuating unit 15 is connected with lower cavity 9 of hydraulic drive 7. Control unit 16 of additional electric hydraulic relay 12 is connected to power supply through lower-range electric contact pressure gauge 17 and time relay 18. Control unit 18 of main electric hydraulic relay 15 is connected to power supply through upper range electric contact pressure gauge 17 and time relay 19. Electric contact pressure gauge 17 is mounted in blowing pipe 4 of pumping-power unit 1. Reed contact 20 is mounted on hydraulic drive 7 for engagement with magnet 21 positioned on rod 11 in upper position of rod 11 of hydraulic drive 7 of locking device 6 and is connected in series with upper range circuit of electric contact pressure gauge 17 and control unit 22 of pumping-power unit.

EFFECT: provision for automatic maintaining of predetermined pressure in closed irrigation main and wider range of usage.

1 dwg