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Diameter Transition – Seamlessly connects pipes or tubes of different sizes, reducing the flow path from a larger to a smaller diameter
Concentric Design – Centered, symmetrical reduction maintains a uniform centerline, ensuring balanced flow and minimizing turbulence
SMS Standard Compliance – Manufactured to SMS (Swedish Milk Standard) dimensions and tolerances, ensuring compatibility with other SMS fittings
Butt Weld Ends – Designed for permanent welding to tubing or other fittings, creating a leak-proof, flush, and crevice-free connection
Hygienic Crevice-Free Interior – Smooth internal surface with no dead zones, minimizing bacterial growth and ensuring sanitary integrity
High Corrosion Resistance – Available in 304 and 316L stainless steel, offering excellent resistance to process media and cleaning agents
Wide Size Range – Available from 1.5" to 4" tube OD, with various inlet-to-outlet combinations
Superior Surface Finish – Interior and exterior polished to 180 Grit or better, meeting hygienic standards
Permanent, Hygienic Joint – Welded connection provides a leak-proof, crevice-free seal that meets 3A sanitary standards for food and dairy equipment
Smooth Flow Transition – Concentric design with gentle contours minimizes pressure drop and turbulence, ensuring efficient fluid handling
Superior Cleanability – Crevice-free design supports CIP cleaning procedures without requiring disassembly
Uniform Wall Thickness – Precision-engineered with consistent wall thickness for reliable performance and weldability
Long Service Life – Stainless steel construction ensures exceptional durability under high-temperature and high-pressure conditions
Versatile Applications – Suitable for food processing, beverage production, dairy, pharmaceutical manufacturing, biotech, and cosmetics industries
Full Traceability – Each fitting comes with material test reports and full traceability to ensure quality compliance
The S31W SMS Concentric Reducer functions as a diameter transition component within a sanitary piping system:
Positioning – The reducer is placed in the piping run where a transition from a larger to a smaller diameter is required
Welding – The butt weld ends are welded to corresponding pipes or fittings using orbital or manual TIG welding techniques, creating a permanent, homogeneous joint
Flow Transition – The concentric design smoothly reduces the flow path while maintaining a uniform centerline, allowing fluid to transition efficiently from the larger to the smaller diameter
Pressure Management – The gradual reduction helps maintain line pressure and prevents excessive turbulence or cavitation-
Hygienic Operation – The welded joint has no threads, gaskets, or dead spaces, preventing bacterial accumulation and ensuring sanitary flow-
CIP Compatibility – The smooth, crevice-free interior allows cleaning fluids to pass through effectively, maintaining system cleanliness without disassembly
This design provides a permanent, reliable, and hygienic solution for diameter transitions in critical sanitary applications.
Certified Quality – All our S31W SMS Concentric Reducers are 3A Sanitary Standards certified, meeting the highest industry requirements for sanitary fittings. We also hold CE certification and ISO 9001 quality management system certification, ensuring consistent product excellence
Premium Materials – We use only high-grade 304 and 316L stainless steel, offering exceptional corrosion resistance, weldability, and longevity
Precision Manufacturing – Every reducer is machined to tight tolerances with smooth surface finishes (180 Grit or better) to meet hygienic standards
Stringent Quality Control – Each fitting undergoes dimensional inspection, surface finish testing, and material verification to ensure 100% compliance
Extensive Size Range – From 1/2" to 8" tube OD, we offer a full range of inlet-to-outlet combinations to meet your diameter transition needs
SMS Standard Compliance – All products are manufactured to SMS (Swedish Milk Standard) specifications, ensuring compatibility with your existing SMS piping systems
Full Traceability – Every fitting is supplied with material test reports and traceable documentation for audit compliance
Competitive Pricing – Direct manufacturing capabilities allow us to offer factory-direct pricing without compromising quality
Expert Support – Our team of sanitary fitting specialists provides technical guidance on welding procedures, material selection, and system integration
Reliable Supply Chain – Consistent inventory and fast shipping ensure your projects stay on schedule
Q: What does "S31W" represent?
A: "S31W" is the industry designation for an SMS standard concentric weld reducer. The "S" indicates SMS standard, "31" denotes the fitting type, and "W" indicates weld ends.
Q: What does "SMS" stand for?
A: SMS stands for Swedish Milk Standard, a widely recognized sanitary fitting standard originally developed for the dairy industry and now used across food, beverage, pharmaceutical, and biotech industries.
Q: What materials are available?
A: Our S31W Concentric Reducers are available in 304 stainless steel and 316L stainless steel-1. 316L offers enhanced corrosion resistance for more demanding applications.
Q: What certifications do your products have?
A: Our fittings are 3A Sanitary Standards certified, CE certified, and manufactured under an ISO 9001 certified quality management system. Material test reports (EN 10204 3.1) are supplied with each order.
Q: What industries use this fitting?
A: The S31W SMS Concentric Reducer is widely used in food and beverage processing, dairy production, pharmaceutical manufacturing, biotechnology, cosmetics, and chemical processing industries-.
Q: What sizes are available?
A: We offer sizes from 1/2" to 8" tube OD, with various inlet-to-outlet combinations including 1"x1/2", 1-1/2"x1/2", 2"x1", 3"x1-1/2", 4"x2", 6"x3", and many more.
Q: What is the difference between concentric and eccentric reducers?
A: A concentric reducer has a centered, symmetrical design that maintains a uniform centerline on both the inlet and outlet. An eccentric reducer has an offset design where the centerlines are not aligned, often used to maintain a consistent bottom level for drainage purposes-.
Q: Is this fitting suitable for CIP cleaning?
A: Yes. The crevice-free design with smooth interior surfaces supports CIP (Clean-In-Place) cleaning procedures without requiring disassembly from the system.
Q: What is the surface finish?
A: Our standard surface finish is 180 Grit interior and exterior polish. Special finishes (such as electropolished or higher grit) are available upon request.
Q: What is the minimum order quantity?
A: Please contact our sales team for MOQ information based on your specific size, material, and quantity requirements. We offer flexible MOQs for both standard and custom orders.
