SOURCE OF THE LIQUID HIGH PRESSURE Russian patent published in 1995 - IPC

FIELD: hydraulic equipment. SUBSTANCE: driving cavity of each metering pump behind the plunger is equipped with a spring-loaded rod of piston mounted on its housing outside and coming into contact with the piston at the end of the working stroke. The other end of each spring-loaded rod of piston is equipped with the screen of the contactless pickup, with each of them being attached to the housing of its metering pump. Each two of three liquid-pressure pickups are switched on to the driving cavity. The third one is mounted between the no-return valves and the low-pressure pump connected with the working cavities of the metering pumps through the no-return valves. The working cavities are connected with the user through pressure valves. The valve lowering the pressure is connected to one output channel of the middle-pressure pump. The valve output is connected to distributors having electromagnetic control. The distributors operate the cut-off valves with normally open channels connected with the discharge valve of each metering pump and the output channels of the surge tanks. The input channel of each tank is connected to the corresponding output channel of the middle-pressure pump. The cut-off valves are communicated with the tank of the middle-value pump. EFFECT: facilitated manufacture. 4 dwg