Abstract: Calibrated pressure relief valve constituted by a body, a closure member, a piston which slides tightly in a bore and defines in the body an exhaust chamber and an adjustment chamber, a member for returning the closure member, interposed between said latter and the piston, and by a means for adjusting the position of the piston with respect to the body, on which the piston abuts and which comprises a source of incompressible fluid, of which the delivery conduit is connected to said adjustment chamber, said pressure relief valve further comprising a non-return valve disposed in the conduit connecting the source of incompressible fluid to the adjustment chamber and fixed on the body of the valve. One application of the present invention is the provision of a station for the centralized remote adjustment of the settings of the various valves of a circuit, for example the driver's cab of a hydraulic loading shovel.