Pneumatic pressure reducer

The invention provides a pneumatic pressure reducer. The pneumatic pressure reducer comprises an end assembly, a nozzle assembly, an upper cover assembly, a support assembly, a spring, a gland, an adjusting screw, a mounting plate, an inlet connector and an outlet connector. The end head assembly is connected with the upper cover assembly; the support assembly is installed at the upper end of the upper cover assembly. The adjusting screw penetrates through the support assembly to make contact with the gland. The lower end of the gland is connected with the spring, and the nozzle assembly moves downwards by adjusting the screw and the spring. A working medium is a working gas source provided by a public system of a power system of a certain ship, and a stable required working gas source is provided for a monitoring and protecting system of the turbocharging unit through the pressure reducing function of the pneumatic pressure reducer. The turbocharger unit monitoring and protecting system has the advantages of