Tattletale annuciator and shut-down control for compressors or like equipment

An annunciator and shut-down control for machines equipped with malfunction sensors of the fluid venting type, comprising a cylinder body having a working fluid inlet near one end thereof and plural side wall malfunction sensing ports communicating with the chamber of the cylinder body and adapted for connection with automatic venting means of said malfunction sensors, a piston within the bore of the cylinder body having differential areas on the opposite sides thereof in said bore, said piston having an orifice communicating with said differential areas whereby fluid pressure on opposite sides of the piston in said bore may be equalized, a piston rod secured to the piston and extending beyond one end of the cylinder body and having a position indicator secured thereto for movement therewith, a malfunction indicia means positioned near said rod and indicator and cooperating with the indicator when the piston is stopped in said bore at a particular malfunction indicating position to indicate directly the nature of the malfunction and where located relative to the cylinder body and said sensing ports, a machine start-up and shut-down control valve including an actuator button located in the path of movement of said piston rod and adapted to be engaged by the latter, said control valve having in and out ports for connection respectively with a working fluid supply and a conduit leading to a supply valve for a machine being monitored, said working fluid inlet of the cylinder body adapted for connection with said working fluid supply.