Chemical Compatibility

Knife Gate Valve — Food/Beverage/Biological Process Fluids

Moderate evidence

Named chemicals

sulfite liquor 6%white liquorbeet sugar liquorsstarch slurryfood-processing solids streams

What LibertyCES's vendor documentation shows

Moderate: AVCO names food & beverage and paper & pulp as 6100 industries and meets TAPPI TIS 405-8, but publishes no 3-A or FDA certification, so this belongs on utility/byproduct/solids duty rather than product-contact service. The chart adds the real caution: white liquor at 80°C drops 316SS to C and sulfite liquor holds it at G, so the Hastelloy body/shim option is not a luxury on hot pulping liquor lines. Sulfite liquor and white liquor are the two pulp-and-paper process fluids in the chart that had no family home before this one existed.

Materials documented for this service

304SS, 316SS, Hastelloy body and shim
EPDM, Buna, Neoprene, Viton or Metal seats
Flowline chart: 316SS rates G on sulfite liquor 6% at both 40°C and 80°C, and drops to C on white liquor at 80°C — pulp/paper process liquors are harder on stainless than they look

Products cited for this service

AVCO 6100 Series Knife Gate Valve (2"-24", ANSI Class 150, 304SS/316SS/Hastelloy body and shim, EPDM or Metal seats most common, MSS-SP-81 and TAPPI TIS 405-8)

Sourced to

data/vendor-sources/avco-valve-mining.md
data/reference/flowline-chemical-compatibility.csv

Every material and product claim on this page traces to the vendor documentation listed above. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.

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