Section 40 05 61.43 — Knife Gate Valves
Real AVCO Valve 6100 Series data for abrasive slurry isolation — MSS-SP-81/TAPPI TIS 405-8 compliant, 2"-24", ANSI Class 150.
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Request a Spec Review →Knife Gate Valves for Solids-Laden Isolation Service
Section 40 05 61.43 covers knife gate valves — a flat-gate isolation valve purpose-engineered for abrasive, solids-laden slurry service, where the gate's bevel-edged bottom cuts through settled solids rather than trying to seal around them the way a standard ball or butterfly valve's rotating geometry has to. This is a full-bore on/off isolation valve, not a throttling valve.
Provide This to Get a Real Match Against the Section
| What to Provide | Why It Matters |
|---|---|
| Line size and pipe schedule | AVCO's 6100 Series covers 2"-24" — confirm the exact size against the process line before quoting. |
| Solids content / abrasiveness of the slurry | Determines gate/seat wear rate and service interval, and whether the standard 304SS/316SS shim is sufficient or a Hastelloy body/shim is warranted. |
| Isolation vs. throttling duty | Knife gate valves are full-bore on/off isolation valves, not throttling valves — holding a knife gate partway open in continuous abrasive service accelerates gate and seat wear. |
| Body/shim material required | AVCO's 6100 Series offers 304SS, 316SS, or Hastelloy body/shim options — chemical corrosivity of the slurry (not just abrasiveness) determines which is warranted. |
| Applicable standard (MSS-SP-81 or TAPPI TIS 405-8) | Confirm which standard the spec section calls out — the AVCO 6100 Series meets both, but a spec naming only one may have specific test/certification documentation requirements attached. |
AVCO Valve 6100 Series
2"-24", ANSI Class 150, 304SS/316SS/Hastelloy body/shim. Gates polished and lapped on both sides with a machined bevel on the bottom edge specifically to cut through solids and seal tighter when closed; the seat is mechanically locked into the body via a stainless retainer ring rather than a molded-in seal. Meets MSS-SP-81 and TAPPI TIS 405-8.
Section 40 05 61.43 FAQ
Does a dedicated CSI MasterFormat number exist for knife gate valves?
Yes — 40 05 61.43 (Knife Gate Valves), a sub-classification under the general Gate Valves category (40 05 61) in Division 40 (Process Interconnections). This number appears consistently across current product-classification catalogs (ARCAT's CSI 2020 MasterFormat listings). A related, broader classification — 40 05 71 (Solids Handling Valves) — also exists for the valve family knife gate valves belong to functionally; both classifications are current and a spec may reference either depending on how the engineer organized the section.
What makes the AVCO 6100 Series suited to abrasive slurry isolation specifically?
The gates are polished and lapped on both sides with a machined bevel on the bottom edge specifically designed to cut through solids and seal tighter when closed, and the seat is mechanically locked into the body via a stainless retainer ring rather than a molded-in seal that can wear or dislodge under abrasive service.
Can a 40 05 61.43 knife gate valve be specified for throttling duty?
No — knife gate valves are designed as full-bore on/off isolation valves. Holding a knife gate partway open in continuous abrasive slurry service accelerates gate and seat wear from solids passing through a partially restricted opening. A spec calling for throttling duty on an abrasive line needs a different valve type — confirm the actual duty before ordering.
What sizes and pressure classes does the AVCO 6100 Series cover?
2"-24", ANSI Class 150, in 304SS, 316SS, or Hastelloy body/shim, meeting MSS-SP-81 and TAPPI TIS 405-8.
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