Standard Sanitary SS Mixer

Product Overview

The standard sanitary SS mixer is the most widely deployed sanitary mixer in the ywmixing range. It is built in DN25 to DN150 main-line sizes, with the same polished SS316L housing and tri-clamp ferrule ends as the other sanitary variants, but with a wider element count range (3-8 elements) and support for both SV plate and SK helical geometries. The standard version is the workhorse of pharmaceutical, biotech, dairy, and food processing lines, and is the variant we recommend when the application is "general-purpose sanitary blending in a validated CIP/SIP loop."

The unit is rated for the standard PN16 (10 bar) sanitary pressure class and the standard EPDM gasket temperature envelope of -10°C to +130°C. The polished surface is Ra ≤ 0.8 μm mechanical as standard, with electropolish to Ra ≤ 0.4 μm available for bioprocess and gene-therapy service. The element pack is removable for cleaning and inspection, and the housing remains in the line. The mixer supports CIP at 1.5-2.5 m/s and SIP at 121-130°C, with the validation report supplied per EHEDG and 3-A requirements.

The standard sanitary mixer is the variant most commonly specified in the OEM skid packages for pharmaceutical and food processing equipment. It is the default mixer in the buffer make-up skid, the WFI distribution loop, the CIP return loop, the ingredient blending line, and the media preparation system. The DN50-DN100 sizes account for approximately 60% of the sanitary mixers we ship, and the DN25-DN150 range accounts for approximately 90%.

Design Features

The standard sanitary housing is a single SS316L forging for DN25-DN100 sizes, and a fabricated SS316L spool for DN125-DN150. The internal bore is polished to Ra ≤ 0.8 μm as standard, with no sharp corners at the ferrule-to-bore transition. The bore is straight and unobstructed except for the element pack, which is supported by machined shoulders at each end of the housing. The element pack is retained by an internal tri-clamp ring at the upstream end and a retaining shoulder at the downstream end.

The element pack is a stand-alone assembly that slides into the housing on a precision spigot. For SV plate technology, the plates are stacked with the corrugations rotated 90° to each other, captured between two end caps, and held in compression by a small disc-spring. For SK helical technology, the elements are twisted from flat bar and welded end-to-end to form a continuous helix, with the upstream end pinned to a shoulder. Either design produces a robust, cleanable element pack that can be removed in seconds.

The housing is fully drainable: the bore is straight, the element pack is centered, and there is a 1-2° slope toward the outlet in the standard installation orientation. When the line is drained, gravity pulls all residual fluid to the outlet, and the polished surface does not retain a film. The drainability is documented in the validation report per EHEDG Doc 2 and 3-A 18-03.

All wetted materials comply with FDA 21 CFR and USP Class VI. The SS316L housing is supplied with a 3.1 MTR and a ferrite content report. The EPDM gaskets are USP Class VI tested and supplied with a lot-traceable certificate. The element pack is supplied with a 3.1 MTR for the SS316L material and a surface-finish report. The mixer is passivated per ASTM A967 and delivered in a Class 100 cleanroom double-bag.