The SV-1 synchro valve is an air signal-operated, non-graduating (on-off) control valve offered in a variety of pressure settings and is used to delay or sequence the action of other pneumatic devices. When used in non-automatic applications it controls a separate air system circuit. The SV-1 valve can also be used as an automatic controller (when its supply and control are connected). The valve will open, close and exhaust automatically as the control and supply pressures rise or fall.