The utility model relates to the technical field of pressure limiting valves, and discloses a manual low-pressure lubricating
oil pressure limiting valve which comprises a main body mechanism, a connecting mechanism and an auxiliary mechanism. According to the manual low-pressure lubricating
oil pressure-limiting valve, by installing the main body mechanism, in the using process, due to the fact that the pressure of a lubricating oil
system of a
diesel engine is determined by the number of revolutions of the
diesel engine, the output pressure of a belt pump is low at the low number of revolutions, the
system pressure acts on the bottom of the valve element, the set acting force of a pressure adjusting spring is larger than the
system pressure, and the pressure-limiting valve is in a
closed state;
system pressure acts on the bottom of the valve element in a high revolution state, the set acting force of the pressure adjusting spring is smaller than the
system pressure, the valve element is opened, the system is decompressed, excessive lubricating oil flows back to an
oil tank, the opening size of the valve element is in direct proportion to the set value of the pressure adjusting spring, the set values of different diesel engines are different, and the set value of the pressure adjusting spring can be changed by the pressure adjusting screw. The manual low-pressure lubricating
oil pressure-limiting valve is simple in structure, high in sensitivity, convenient to set parameters, flexible in installation form, convenient to maintain and low in cost, and the practicability of the manual low-pressure lubricating oil pressure-limiting valve is improved.