ZZY-II with the command of self-pressure regulating valve (with command-Pressure Regulating Valve) without additional energy use by the media itself for pressure changes can be automatically adjusted so that constant pressure valve, a movement sensitive complete machine control Small pressure fluctuations in energy conservation.

Operating self-command of a pressure regulating valve power source and signal detection method separate points, plus an adjustable flow devices, so that the entire valve regulation accuracy greatly improved, the largest optional decompression than 2000:1. Widely used in all kinds of vacuum gas regulator Automatic Control occasions, and are particularly suited as a nitrogen valve closure for the use of ammonia, nitrogen pressure for a continuing small, responsive and so on.