Sanitary DIN Union Liner for Stainless Steel Food Equipment
The Sanitary DIN Union Liner is engineered for high-performance hygienic connections in demanding industries like pharmaceuticals and food processing.
Why Engineers Specify This Item
- Its quick-release design enables effortless disassembly for cleaning and maintenance, minimizing downtime.
- Precision-manufactured to comply with AS, BS, 3A, SMS, and DIN standards, this liner meets stringent FDA, 3A, and CE certifications for safety-critical applications.
- Constructed from premium 304 or 316L stainless steel, it ensures superior corrosion resistance and durability.
- The optimized sealing surface guarantees leak-free tri-clamp connections, while the standardized dimensions ensure seamless integration with existing sanitary piping systems.
What It Prevents
- Mixed union patterns on one site so spares never fit the joint that failed
- Union gaskets extruding into the bore and disturbing flow
- Joints that have to be unbolted with tooling every time a hose is swapped
Technical Data
Figures below are the catalogue range for this item. Exact dimensions are confirmed in writing against the standard you work to before production.
| Material | SS 304 or SS 316L for option |
|---|---|
| Media | Water, oil, milk, beverage, sanitary fluid etc |
| Connection | Butt-Welded, Thread, Clamped, Flange |
| Size Range | 1"-6" |
| Pressure | 0-20Bar |
| Working Temperature | -20 C to 120 C |
| Standard | AS, BS, 3A, DIN, SMS, ISO |
| Gasket | EPDM/SILICON/PTFE/VITON |
| Certification | 3A, FDA, CE |
Materials
- SS 304
- SS 316L
Manufacturing Process
- Machining
- Forming and welding
- Interior polishing
- Assembly
- Quality inspection
Quality Control
- Dimensional check against the standard stated on the order
- Surface finish verified against the specified Ra figure
- Visual and leak inspection before packing
- Material certificates to EN 10204 3.1 available on request
Where It Is Installed
- Hose connection points that are broken every shift
- Equipment inlet and outlet on a machine shipped to a European plant
- Instrument isolation that must be removable without tools
- Retrofit onto an existing DIN or SMS plant
Who Buys It
- Plants that break joints daily for hose changes and equipment swaps
- Sites in Europe and Scandinavia standardised on DIN or SMS unions
- Exporters supplying machines into markets with a fixed union standard
What It Is Built To
- 3A
- FDA
- CE
What We Can Change
- Non-standard sizes made to your dimensions
- Special connection types and mixed-standard ends
- Customised surface finish down to Ra 0.4 um
- Seal material selected for your media and CIP cycle
How It Compares
Compared with Sanitary Tees
Specify the Sanitary DIN Union Liner for Stainless Steel Food Equipment where the duty is what this category is built for: threaded union sets that let a line be broken and remade by hand, in DIN 11851, DIN 11864, SMS, RJT and IDF patterns. Move to sanitary tees instead where the requirement is branch fittings in clamped, welded and union versions, including short outlet, Y-type, U-type and instrument tees.
Compared with Sanitary Elbows and Bends
Specify the Sanitary DIN Union Liner for Stainless Steel Food Equipment where the duty is what this category is built for: threaded union sets that let a line be broken and remade by hand, in DIN 11851, DIN 11864, SMS, RJT and IDF patterns. Move to sanitary elbows and bends instead where the requirement is 45, 90 and 180 degree bends in clamped, welded and threaded versions, including long radius bends for pumped product.
Compared with A general industrial equivalent
An industrial-grade part of the same nominal size is usually cheaper and carries no declared hygienic surface finish, no crevice-free joint geometry and no material certificate. On a product contact line that difference shows up at the first swab test, not on the purchase order.
Installing and Living With It
Bring the two ferrule faces square before closing the clamp. Fit the gasket dry and seated in the groove, then tighten the clamp evenly; overtightening extrudes the gasket into the bore.
Purge the bore with inert gas before welding and keep heat input low so the heat affected zone does not discolour. Polish the internal weld to the finish specified for the rest of the line.
Do not use tape or sealant on a hygienic union thread. The seal is made by the gasket at the liner seat, not by the thread, so check the gasket is seated before tightening the nut.
Align the flange faces parallel before drawing the bolts up, and tighten opposite pairs in stages so the gasket is loaded evenly across the face.
Keep the duty inside the stated working temperature range of -20 C to 120 C. Running a CIP cycle hotter than the seal material allows is the most common cause of early failure on this item.
Do not exceed the 0-20Bar working pressure. Where the line sees pressure pulsation, specify a heavy duty or bolted clamp at the joints either side.
Record the standard, size, material and seal material fitted, so the replacement ordered in two years matches what is installed today.
Others in the Unions Range
Sanitary Solid End Cap with Chain for Food Processing Equipment
Sanitary SMS Round Nut with 6 Slots Stainless Steel Fittings
Sanitary Stainless Steel SMS Complete Union for Food Processing Pipelines
Sanitary Stainless Steel RJT Complete Union for Hygienic Pipeline Connections
Guides That Cover This Item
Sanitary Fitting Standards Compared AS1528 BS4825 DIN SMS and RJT
Six standards, one job. Here is what actually differs between them and how to tell which one your plant already uses before you or...
Surface Finish Ra and Why Polished Is Not a Specification
Ra 0.8 um is the standard finish on everything here, with Ra 0.6 um and Ra 0.4 um available. This is what the figure means and whe...
Industries This Item Serves
Related Capability
Sanitary DIN Union Liner for Stainless Steel Food Equipment FAQ
What we are asked before this item is ordered.
What sizes is the Sanitary DIN Union Liner for Stainless Steel Food Equipment available in
The catalogue range is 1"-6". Dimensions follow the AS, BS, 3A, DIN, SMS, ISO standards. Confirm the tube outside diameter and wall thickness you work to when you enquire and we will match the exact dimensions before production.
Which material should I specify for the Sanitary DIN Union Liner for Stainless Steel Food Equipment
Material options are SS 304 or SS 316L. Choose 316L where chlorides are present or where the item will be welded into a line that has to be validated; 304 is adequate for neutral product and standard caustic CIP. Material certificates to EN 10204 3.1 are available on request.
Which seal material suits my cleaning cycle
The Sanitary DIN Union Liner for Stainless Steel Food Equipment is supplied with EPDM/SILICON/PTFE/VITON sealing options. EPDM is the default for hot water and caustic CIP, silicone for high temperature steam contact, PTFE for aggressive chemicals and Viton for oils and fats. Tell us the media and the peak CIP temperature and we will specify it on the order.
What is the lead time and minimum order for this item
Standard catalogue items such as the Sanitary DIN Union Liner for Stainless Steel Food Equipment are typically 7-15 days, and small quantity orders of standard items are accepted. Custom sizes, special connections and bulk quantities are quoted with a confirmed date before production starts.
Quote the Sanitary DIN Union Liner for Stainless Steel Food Equipment
Send the size, media, working pressure, temperature and the standard you work to. We confirm dimensions, material and finish in writing before quoting.