AUTOMATIC MACHINE FOR DISCHARGING PUMP Russian patent published in 1999 - IPC

FIELD: pump stations of powered timbers for automatically discharging pumps. SUBSTANCE: automatic machine includes housing with ducts for supplying, removing and draining working liquid, non-return valve, servovalve having locking member with guiding stem, successively arranged: pushing piston, intermediate and additional pushers and discharging valve in the form of differential piston with soft collar type sealing. Discharging valve is provided with radial and axial ducts for passing working liquid at operation of valve from high-pressure cavity to draining cavity at bypassing sealing. The last does not engage with flow of working liquid. EFFECT: significantly increased service life period of sealing, enhanced reliability of automatic machine for discharging pump. 4 dwg