SANITARY UNIONS

Sanitary Threaded Unions

卫生级螺纹活接头.jpg

1. Definition & Types‌

Sanitary threaded unions are hygienic pipe fittings with threaded connections, primarily used in food, pharmaceutical, and chemical industries. Key variants include:

  • ‌Hexagon nut unions‌: Compliant with 3A/SMS standards, featuring internal/external threads for secure assembly ‌

  • ‌Threaded liner unions‌: Designed with male/female NPT or BSP threads for small-bore piping (≤NPS 2) ‌

‌2. Material & Standards‌

  • ‌Body material‌: Stainless steel (304/316L) with mirror polish (Ra ≤0.8μm) ‌

  • ‌Thread standards‌:

  •  ‌   NPT/BSP‌: ASME B1.20.1 for tapered threads ‌

    ‌    3A/SMS‌: For sanitary applications (e.g., DN15-DN150) ‌

‌3. Key Dimensions‌

 ‌   Size (DN/NPS)‌‌Thread Type‌‌Hex Nut Width (A)‌‌Sealing Method‌
    1" (DN25)1/8TACME23 mmSilicone/EPDM gasket ‌
    2" (DN50)NPT38.1 mmPTFE tape sealing ‌

‌4. Applications‌

  • ‌Low-pressure systems‌: Cooling water, CIP/SIP pipelines (≤1 MPa) ‌

  • ‌Sanitary processes‌: Dairy, biotech, where quick disassembly is required ‌