The oil pressure, acting on the check ball valve in the oil spray nozzle valve, opens and closes the nozzle oil passage and controls the start and stop of oil supply. The oil pressure exceeding a certain value, acting on the ball check valve in the oil spray nozzle valve, opens the nozzle oil passage, and oil is injected. Conversely, when the oil pressure does not exceed a certain value, the check ball valve is blocked by the force of the spring and oil injection stops.
Pic. 2.46. Installation location of the oil spray nozzle valves: 1 - oil spray nozzle valve; 2 - block of cylinders; 3 - crankshaft