Explain: This series collects all kinds of connection forms and structural couplings, nipples, nozzles, rotary couplings, thermowells and other products in the automatic control instrument pipeline system. It is an essential connecting piece in the pipeline with a wide range of varieties, specifications and applications. The union YZG15 series is one of the auxiliary connectors of the automatic control system, which is applicable to various measurement, signal and air source pipelines. Unions are mainly used for long pipelines and pipelines where multiple equipment are installed. The reason for using unions is to facilitate installation and maintenance. Unions are usually used on pipes with small pipe diameters (flange connection is used for large pipe diameters). They are usually used in DN15～40. As a series of products, the pipe diameter is from DN15 to DN70. Usually, the union is not used when DN>50.
