(under subclass 108) Systems wherein the load device is connected to the pressure regulating device by a conduit which includes a valve, the system including means to operate the valve when the gas pressure deviates from normal.
SEE OR SEARCH CLASS
137, Fluid Handling,
455+, for valves which are responsive to a change in line condition, such as pressure.
313, Electric Lamp and Discharge Devices,
545, for lamps and discharge device structure which include a valve so that the lamp or discharge device may be either evacuated or have gas or vapor introduced into the lamp or discharge device.
