Knife gate valves, built in Longview, Washington.
Cast and fabricated knife gates from 2 in to 120 in, rated up to 600 psi, for water, wastewater, hydropower, mining and industrial service. Engineers get spec help, contractors get bid-ready submittals, owners get valves that can be rebuilt instead of replaced.
Start where your project starts.
Most knife gates get chosen three times: once in the spec, once at bid, and once by the people who run them for decades. We built this site for all three.
Consulting engineers
- Starter spec language you can edit
- Selection help for slurry, sludge and high pressure
- Drawings and data for your design package
Contractors
- Bid pricing for hard bid, CMAR and design-build
- Submittals and domestic content letters
- Ship dates you can put in a schedule
Owners and operators
- Replaceable seats, liners and packing
- Reconditioning and parts
- Retrofits where a valve keeps failing
Which knife gate fits your line?
Answer four questions and get a starting point from the Fabricast line. Then send us the details and an engineer will confirm it.
The knife gate line
Every model is designed and tested to MSS SP-81 with ASME B16.5 drilling. All of them take pneumatic, hydraulic, electric or gear operators without welding. See full specs
| Model | Seat | Shutoff | Body | Rating (CWP) |
|---|---|---|---|---|
| FIG 40 | Metal | Uni-directional | Cast CF8 (304) stainless | 150 psi |
| FIG 50 | Resilient, perimeter | Bi-directional | Cast CF8 (304) stainless | 150 psi |
| FIG 61 | Dual replaceable polymer | Bi-directional, drip-tight | Cast CF8M (316) stainless | 150 psi |
| FIG 145 | Replaceable polymer liners | Bi-directional, drip-tight | Fabricated A36 steel, 2 to 48 in | 150 psi |
| FIG 240 | Metal, bolted bonnet | Uni-directional | Cast 304 or 316 to 36 in, fabricated 42 in and up | 150 psi |
| FIG 345 | Replaceable polymer liners | Bi-directional, drip-tight | Fabricated A36 steel, 2 to 48 in | 300 psi |
| DBB | Dual gates, polymer lined | Double block and bleed | Fabricated A36 steel, to 48 in | 150 psi |
Federally funded project? Start with the paperwork.
AIS, BABA and Buy American are three different rules. We explain which one your job is under and send a signed, project-specific letter with the submittal.
American Iron and Steel
State Revolving Fund water and wastewater projects. Fabricast AIS compliant configurations listed by model.
Build America, Buy America
Infrastructure projects with federal financial assistance since May 2022. Fabricast BABA compliance by model and configuration.
Buy American
Direct federal contracts, such as some federal dams and facilities. Fabricast Buy American compliance by model.
Where Fabricast gates work
Municipal water
Raw water, intakes, filter and process isolation.
Wastewater
Sludge, scum, digesters, grit and pump station isolation.
Hydropower
Large bore and high pressure isolation for penstocks and bypasses.
Mining and oil sands
Tailings and abrasive slurry with replaceable liners. CRN registration for Canada.
Big gates are normal here.
Fabricated knife gates to 120 in, built and tested in the same shop. See project photos
Have a drawing, a spec or a failing valve?
Send it to us. You will hear back from someone who builds knife gates, not a call center.