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Technical Datasheet -- Bidirectional Knife Gate Valves for Slurry and Pulp Service
Bidirectional knife gate valves for slurry, pulp, paper, mining, and wastewater applications. Sharp-edged SS316 knife gate cuts through suspended solids and fibrous media without jamming. MSS SP-81 / EN 12334 compliant. Wafer or lug body with replaceable soft seat and gate.
| Parameter | Specification |
|---|---|
| Product Type | Knife Gate Valves |
| Category | Gate Valves |
| Size Range | 2" to 48" (DN50 to DN1200) |
| Pressure Rating | PN10 / PN16 / Class 150 |
| End Connections | Wafer type or Lug type per MSS SP-81 |
| Body Material | ASTM A351 CF8M (SS316) / ASTM A216 WCB with SS316 gate |
| Gate Material | SS316 knife-edge gate with Stellite or chrome plating on cutting edge |
| Seat Material | EPDM / NBR / Viton (FPM) / PTFE / metal seat (bi-directional sealing) |
| Stem Material | SS316 rising stem with two-piece stem coupling for in-line replacement |
| Face-to-Face | MSS SP-81 short pattern (compact wafer design) |
| Operation | Handwheel (standard) / Bevel gear (large sizes) / Pneumatic cylinder / Electric actuator |
| Leakage Class | MSS SP-81 / EN 12334 -- zero visible leakage for soft-seated valves |
| Temperature Range | -20 deg C to +120 deg C (EPDM) -- up to +200 deg C (PTFE/metal seat) |
| Component | Material |
|---|---|
| Stainless Steel | ASTM A351 CF8M (SS316) body and gate -- corrosion and abrasion resistant |
| Carbon Steel | ASTM A216 WCB body with SS316 gate and liner (economical option) |
| Seat Elastomers | EPDM (water / slurry), NBR (oil), Viton FPM (chemical), PTFE (high temp / chemical) |
| Gate Overlay | Stellite 6 or hard chrome plating on cutting edge for extended wear life in abrasive service |
| Test | Requirement |
|---|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
| Standard | Description |
|---|---|
| Design Standard | MSS SP-81 Steel Knife Gate Valves, EN 12334 |
The Knife Gate Valve -- MSS SP-81 SS316 is designed, manufactured, and tested in accordance with applicable API / ASME / BS / ISO international standards. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.
Standard construction is carbon steel, stainless steel (CF8 / CF8M), and special alloy grades. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.
It is offered in a range of sizes as per the technical specification with standard ANSI / ASME pressure classes (PN ratings on request). End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.
Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.
Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.
Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.