Diaphragm operated pressure regulator

A diaphram operated pressure regulator, in particular for controlling the servo control pressure for a gas control apparatus, comprising a housing enclosing a valve, a diaphram carrying a closure member for the valve, a first adjusting spring biasing the closure member in the closing direction and determining the maximum outlet pressure of the regulator, a second adjusting spring biasing the closure member in the closing direction and determining the minimum outlet pressure of the regulator, a cover for said housing, a first adjusting screw carried by said cover for adjusting said second adjusting spring, means for adjusting the first adjusting spring including an externally exchangeable auxiliary spring guided in a threaded hole in said cover closed by a second adjusting screw, and a transmission lever by which the force of a thermo-mechanical transducer acts upon the first adjusting spring, the adjusting screws for the two adjusting springs as well as the transmission lever being located outside the line of alignment of the valve and closure member, the transmission lever borne tiltably with its one end around a stationary axis and carrying adjacent its free end a support for a tilting bearing, an intermediate lever being rotatably borne in said tilting bearing and carrying said first adjusting spring, the intermediate lever with its end facing the second adjusting screw for the first adjusting spring abutting against an abutment of the transmission lever, the transmission lever being biased by a spring which, with its one side, engages the housing and which operates opposite the force of a control value.