Safety pressure limiting valve for high-pressure common rail of diesel engine

The invention discloses a safety pressure limiting valve for a high-pressure common rail of a diesel engine. The safety pressure limiting valve comprises a valve body, a valve seat and a valve element, wherein a spring is installed at one end of the valve element through a spring seat, and a replaceable pressure adjusting gasket is arranged between the other end of the spring and the valve body. A limiting mechanism for limiting the moving stroke of the valve element is arranged between the valve body and the valve element, a stability maintaining pressure chamber and a high-pressure chamber which are internally communicated are arranged on the valve seat, the valve element moves along the stability maintaining pressure chamber, and one end of the valve element makes contact with one side of the stability maintaining pressure chamber. An inner hole is formed in the valve element, an overflow hole communicated with the interior of the valve body is formed in one side of the inner hole, a steel ball used for se