Abstract: The moving coil actuator of a pressure regulator has two threaded adjustment screws each mounted parallel to the actuator's path and which project through a limit surface of a carrier for the moving oil actuator. Both adjusting screws can be rotated by means of a tool, but their mounting prevents them from being moved longitudinally. Each of the adjustment screws carries a limit element, one on each side of the carrier's limit surface. The position of each of the limit elements on its adjustment screw is adjustable by means of an internal thread. In the preferred embodiment, each adjustment screw is partly enveloped by a projection on the limit element carried by the other adjustment screw, by which each limit element is secured against rotation during adjustment. The limit elements independently limit the stroke of the moving coil at each end by blocking movement of the limit surface when the actuator reaches its desired limit.

Abstract: A gas control apparatus with a pressure regulator selectively controls the setpoint of the regulator by an electrical current between a minimum and a maximum value of the gas outlet pressure. A diaphragm of the regulator is exposed to the pressure to be controlled and carries a closure member of a bleed valve. A control spring for determining the setpoint of the gas pressure acts between the diaphragm and an adjustable abutment. A solenoid actuator acts between a valve rod of a switch-on valve located between an inlet of the apparatus and the regulator and the abutment. A reset spring for the armature of the actuator acts between a stationary abutment and the armature to engage the armature after the armature has opened the switch-on valve. Thus, the solenoid actuator responds to an electrical current to control the operation of the switch-on valve to provide an inlet pressure for the regulator.