Switching system with piston type low-pressure nitrogen compressor providing instrument air

The utility model discloses a switching system with a piston type low-pressure nitrogen compressor providing instrument air. The working procedures of the switching system include that a compressed nitrogen working procedure is switched to a compressed instrument air working procedure, and then the compressed instrument air working procedure is switched to a compressed low-pressure nitrogen working procedure. The switching system solves the problems of low utilization ratio, daily maintenance cost and the like of existing idle equipment. By the aid of the switching system, balance of an instrument air pipe network is ensured when an instrument air compression station (or an air separation unit) is in accidental shutdown, the low-pressure nitrogen compressor system is improved to be capable of compressing the air so as to emergently provide the instrument air for all workshops of an enterprise, and further safety is ensured, production is resumed quickly, and the switching system is of great significance for m