Industrial Knife Gate Valves

MSS SP-81 / MSS SP-135Knife Gate Valves
Slurry & ProcessUni & Bidirectional

Industrial Knife Gate Valves

Knife gate valves for slurry, pulp, wastewater and dry-bulk service to MSS SP-81 (uni-directional) and MSS SP-135 (bidirectional). Sizes 2″ to 48″, cast iron, ductile iron, CF8M stainless and duplex bodies. Resilient or metal seats, manual handwheel, bevel gear, pneumatic or electric actuation.

MSS SP-81 MSS SP-135 ASME B16.5 EN 593 ISO 5211 PED 2014/68/EU

Toronto-based · Serving Canada · USA · UK · Europe · Middle East

MSS SP-81
Knife Gate Valves
2″–48″ · CI · DI · SS · Duplex

Configurations

Uni-Directional Wafer

Economical wafer pattern for on/off slurry isolation; resilient seat for drop-tight shutoff in preferred direction.

Bidirectional

MSS SP-135 double-seated design seals both directions — ideal for tailings, pipelines and bidirectional headers.

Through-Gate & O-Port

Full-round port designs for high-solids, paste and dry bulk handling without dewatering pockets.

Options & Actuation

Seat Choices

Natural rubber, EPDM, nitrile, PTFE or integral metal seats with scraper rings for abrasive media.

Actuation

Handwheel, chainwheel, bevel gear, pneumatic cylinder (double-acting/spring-return) or electric — ISO 5211 mounting.

Accessories

Gate guards, purge ports, proximity switches, solenoid + positioner packages for automated systems.

Typical Applications

Mining & Tailings — abrasive slurry isolation, cyclone feed, thickener underflow
Pulp & Paper — stock lines, broke, white water systems
Wastewater — sludge, grit, digester and headworks isolation
Power (FGD) — lime slurry and gypsum service
Bulk Handling — fly ash, cement, dry powder isolation

Request a Quote — Industrial Knife Gate Valves

Knife gate valves matched to your medium and abrasion profile. CI/DI resilient-seat 4–6 weeks; SS/duplex and automated packages 8–12 weeks. Send your datasheet for a detailed offer within 24–48 hours.

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