316L Sanitary & Hygienic
Brewery Valve and Heat Exchanger Selection: Wort, Fermentation, Cellar and CIP
Brewing has its own vocabulary and its own failure modes: hop acids that attack elastomers, caustic CIP at 80 °C, CO₂ that permeates and decompresses, and a product that is spoiled by oxygen pickup measured in parts per billion. The valve schedule has to serve all of it.
Process areas and their demands
| Area | Temperatures | Media | Valve priorities |
|---|---|---|---|
| Mash tun / lauter | 62–78 °C | Mash, wort, spent grain | Full bore, low shear, abrasion resistance |
| Kettle / whirlpool | 100 °C boiling, hot trub | Hot wort with hops | Temperature rating, drainability, hop-acid compatibility |
| Wort cooling (heat exchanger) | 98 °C → 8–12 °C | Wort / glycol | Close approach temperature, cleanability, low ΔP |
| Fermentation / cellar | 0–20 °C | Beer, yeast, CO₂ | Oxygen exclusion, CO₂ rating, cleanability |
| Bright beer / filtration | 0–5 °C | Beer, CO₂ | Low oxygen pickup, no shear |
| CIP set | Caustic 1–2% at 60–80 °C; acid; PAA or peracetic sanitiser | Caustic, acid, sanitiser | Full chemical compatibility, temperature |
| Utilities | Ambient to 140 °C | Steam, glycol, hot liquor | Pressure and temperature rating |
Heat exchangers: the brewhouse decision
Wort cooling is the single largest energy transfer in the brewery, and the exchanger choice determines both the cooling rate and the cold break quality.
| Type | Use in the brewery | Advantages | Limitations |
|---|---|---|---|
| Plate-and-frame, gasketed | The standard wort chiller | High heat-transfer coefficient, close approach temperature of 1–2 °C, easy to expand | Gaskets are a maintenance item and a leak path; limited pressure |
| Plate-and-frame, brazed or welded | Glycol / small skid duty | Compact, no gaskets | Cannot be mechanically cleaned; not for wort |
| Tube-in-tube (multi-tube) | Wort cooling where cleanability and solids tolerance matter; beer-to-beer or beer-to-glycol | No gaskets in the product path, handles trub and hop matter, cleanable | Larger footprint, lower coefficient than plate |
| Shell-and-tube, hygienic | Large brewhouses, hot liquor | Robust, high pressure, weldable product side | Lower coefficient, larger |
| Scraped surface | Fruit, high-viscosity or crystallising products | Handles fouling and particulates | Cost and maintenance |
Valves: what brewers actually specify
- Hygienic butterfly valves — the default on cellar, tank outlets and large pipework up to DN150. Easy to strip, low cost, good cleanability; specify a seat that does not create a pocket.
- Hygienic diaphragm valves — product-contact shut-off,取样 points, and anywhere drainability matters more than full bore.
- Full-bore hygienic ball valves — CIP sets, drains, and services where a piggable or rod-able line is needed.
- Double-seat / mixproof valves — in larger breweries routing product and CIP simultaneously through a common manifold.
- Sample valves — a diaphragm or needle design that can be steam-sanitised before taking an aseptic sample.
Elastomers and hop acids
Hop alpha and iso-alpha acids are aggressive towards some elastomers, and combined with 1–2% caustic at 80 °C and peracetic acid sanitiser, they define the material choice. EPDM is the standard for hot wort, CIP and steam; FKM is used where hop extract or oil contact is significant; PTFE is used where chemical resistance dominates and resilience is less important. On the cold side, confirm the elastomer retains resilience at 0 °C — a hardened seat on a cellar valve is a common CO₂ leak source.
Oxygen, CO₂ and the details that spoil beer
- Oxygen pickup. Every gasket face, every clamp joint and every valve stem is a potential oxygen ingress point. Use bore-matched gaskets, keep the loop positively pressurised, and purge properly before transfer.
- CO₂ permeation. Elastomers permeate CO₂; a long shutdown with a carbonated product in a line can decarbonate through the seat. Specify the appropriate material and avoid trapping carbonated product in dead legs.
- Pressure rating. Cellar lines run at 1–2 bar for fermentation but bright beer tanks and carbonation can reach 3–4 bar; CIP surges add more. Confirm the rating at the CIP temperature, not ambient.
- Drainability. Beer lines must drain completely; a low point that holds product will infect the next batch.
- Yeast and dry hop. Full-bore, low-shear valves; butterfly or ball rather than a restrictive globe pattern, so that yeast and hop solids pass without damage or blockage.
CIP in the brewery
Brewery CIP typically runs caustic at 60–80 °C for 20–40 minutes, with periodic acid descaling of the bright beer and kettle stone (calcium oxalate and protein). Sanitisation is with hot water above 85 °C, or peracetic acid or a similar no-rinse sanitiser on cold lines. Verify that every valve in the circuit is compatible with the full envelope, and pay particular attention to sight glasses, sample valves and the leakage chambers of mixproof valves — the places that get forgotten.
KOSA supplies 316L hygienic valves, fittings and heat exchangers for brewhouse, cellar and packaging duty. Send your process schedule for a matched proposal.
Frequently Asked Questions
Which heat exchanger type is best for wort cooling?
A gasketed plate-and-frame exchanger is the usual choice because it gives a close approach temperature of 1 to 2 degrees Celsius and a high heat transfer coefficient, and it can be expanded later. Where hop solids or trub reach the exchanger, or where gasket maintenance is a concern, a tube-in-tube design removes gaskets from the product path and is easier to clean.
What elastomer should be used on brewery valves?
EPDM is the standard for hot wort, caustic CIP and steam. FKM is used where hop extracts or oils are present, and PTFE where maximum chemical resistance is required. On cold cellar lines the elastomer must retain resilience at 0 degrees Celsius to avoid CO2 leaks.
Why does oxygen pickup matter so much in brewing?
Oxygen causes staling and off-flavours at levels measured in parts per billion, so any gasket face, clamp joint or valve stem that admits air can shorten shelf life. Bore-matched gaskets, positive pressure and proper purging are the main controls.
Are butterfly valves suitable for brewery cellar lines?
Yes. Hygienic butterfly valves are the default on cellar and tank outlet pipework because they are low cost, easy to strip for cleaning, provide a largely unobstructed bore and are available in sizes up to DN150. The seat design should avoid creating a pocket where product can be retained.
What CIP conditions do brewery valves need to withstand?
Typically caustic soda at 1 to 2 percent and 60 to 80 degrees Celsius for 20 to 40 minutes, periodic acid descaling, and sanitisation with hot water above 85 degrees Celsius or a peracetic acid based sanitiser. Every elastomer and seat in the circuit must be rated for the full chemical and temperature envelope.
Send us the process data — fluid, inlet pressure, differential pressure, temperature, required flow and pipe size — and our engineers will return a sized selection with Cv calculation, leakage class and material recommendation, plus documentation packs for FAT / IQ-OQ.
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