RJT Unions (BS 4825 Part 5)
RJT (Ring Joint Type) unions are standard hygienic fittings used primarily in the UK dairy and food industries. Governed by BS 4825 Part 5, they are designed for frequently dismantled pipelines.
Key Components
Hexagon Nut: Secures the joint.
Male Part & Liner: The two connecting ends.
O-Ring Seal: A wide, flat-section gasket that sits in a recess.
Attribute,Specification / Detail
Standard,BS 4825 Part 5
Common Name,RJT (Ring Joint Type) or Standard Union
Standard Materials,"316L Stainless Steel (Wetted parts), 304 (Nuts)"
Size Range,1.0" to 4.0" (Standard OD tube sizes)
Thread Type,Whitworth Form (BSW)
Seal Material,"Nitrile (Standard), EPDM, Viton, or PTFE"
Seal Shape,"O-Ring style (Sectional ""O"" shape)"
Max Pressure,Approx. 10 Bar (145 psi) - Varies by size
Temp Range,"Dependent on seal material (e.g., EPDM up to 120°C)"
Hygiene Level,"CIP (Clean In Place) compatible, but better for manual cleaning"
Connection Type,Expanding (Rolled) or Butt-Weld
Component Parts,"Hex Nut, Weld Liner, Weld Male, and Seal"
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