Knife Gate Valve Lugged
Description
FULL LUGGED SS316 KNIFE GATE VALVE – TECHNICAL DATA SHEET
(Metal Seated / All Stainless Steel 316 Construction)
Project Name: ________________________
Item No.: ________________________
Tag No.: ________________________
Quantity: ________________________
Date: ________________________
1. VALVE GENERAL INFORMATION
| Parameter | Specification |
|---|---|
| Valve Type | Knife Gate Valve (Slurry / Heavy-Duty Service) |
| Body Construction | Full Lugged Body – Threaded lug holes for bolting to flanges |
| Body Material | Stainless Steel (ASTM A351 CF8M / AISI 316) |
| Gate / Disc Material | Stainless Steel (ASTM A240 316L) – Hardened / Surface-ground |
| Seat Material | Metal Seat – Integral or Replaceable (SS316 / Stellite-faced optional) |
| Stem Material | Stainless Steel (AISI 316 / 17-4PH) |
| Packing Material | Braided Graphite or PTFE / Aramid Fiber with SS316 wire reinforcing |
| Hardware (Bolts/Nuts) | Stainless Steel (AISI 316) |
| Nominal Size (DN / NPS) | 2″ – 24″ (DN50 – DN600) / Up to 48″ (DN1200) available on request |
| Pressure Rating | Class 150 / PN10 / PN16 |
| End Connection | Full Lugged – Drilled per ASME B16.5 / EN 1092-2 |
| Design Standard | MSS SP-81 (Knife Gate Valves) |
| Face-to-Face Standard | MSS SP-81 |
| Flange Drilling Standard | ASME B16.5 (Class 150) / EN 1092-2 (PN10/16) |
| Inspection & Test Standard | API 598 / ISO 5208 |
| Temperature Range | -29°C to +450°C (Metal seated, graphite packing) |
2. MATERIALS OF CONSTRUCTION
| No. | Component | Material | Remarks |
|---|---|---|---|
| 1 | Body | CF8M (ASTM A351) / AISI 316 Stainless Steel | Full lugged integral casting |
| 2 | Gate (Disc) | AISI 316L (ASTM A240) | Ground finish, hardened edge |
| 3 | Seat Ring | SS316 (Integral or Replaceable) | Metal-to-metal contact; optional Stellite 6 hard-facing |
| 4 | Stem | AISI 316 / 17-4PH Stainless Steel | Large diameter for high torque |
| 5 | Packing | Braided Graphite + Inconel wire / PTFE | Live-loading gland design available |
| 6 | Gland / Yoke | AISI 316 Stainless Steel | Heavy-duty bolted design |
| 7 | Bushings / Bearings | PTFE-embedded Bronze / Duplex SS | Self-lubricating, wear resistant |
| 8 | Thrust Washer | SS316 / PTFE | — |
| 9 | Lug Bolts / Nuts | SS316 (ASTM A193 B8M / A194 8M) | Full-length threaded studs optional |
| 10 | Nameplate | Stainless Steel 316 | Laser-engraved |
Alternative hard-facing options available: Stellite 6, Colmonoy, Tungsten Carbide upon request.
3. DESIGN FEATURES (METAL SEATED / FULL LUGGED)
| Feature | Description | Benefit |
|---|---|---|
| Full Lugged Body | Lug holes are drilled and tapped through the entire body thickness | Allows dead-end service, supports heavy pipelines, installable with two bolt sets |
| Metal-to-Metal Seat | Hardened SS316 gate seats against integral or replaceable metal seat ring | Withstands high temperatures, abrasive slurries, and erosive media |
| Knife-Gate Edge | Gate has beveled cutting edge that shears through viscous media | Ideal for pulp, paper, slurry, and wastewater with fibrous content |
| Uni-Directional / Bi-Directional | Pressure-tight sealing in one or both directions (as specified) | Flexible installation per system requirements |
| High-Strength Stem | Oversized stem with precision square or keyed drive | Handles high actuation torque in dirty services |
| Live-Loaded Packing | Optional Belleville spring washers maintain constant packing pressure | Extends packing life, reduces fugitive emissions |
| Purge Ports | Optional injection ports at the bottom of the body | Allows flushing of accumulated solids in slurry service |
| In-Line Maintenance | Packing can be replaced without disassembling the valve from pipeline | Reduces downtime and maintenance costs |
| Corrosion Resistance | Full 316 stainless steel construction (body, gate, stem, hardware) | Excellent resistance to acids, chlorides, and marine environments |
4. APPLICABLE STANDARDS & SPECIFICATIONS
| Item | Standard |
|---|---|
| Design & Manufacturing | MSS SP-81 (Knife Gate Valves) |
| Face-to-Face Dimensions | MSS SP-81 |
| Flange Connection | ASME B16.5 (Class 150), ASME B16.47, EN 1092-2 (PN10/16), JIS B2220 |
| Inspection & Testing | API 598, ISO 5208 |
| Pressure-Temperature Ratings | ASME B16.34 |
| NACE Compliance | NACE MR0175 / MR0103 (Available on request) |
5. PRESSURE TEST (PER API 598 / ISO 5208)
| Test Type | Pressure | Medium | Acceptance Criteria |
|---|---|---|---|
| Shell (Hydrostatic) | 1.5 × Rated Pressure | Water | No visible leakage |
| High Pressure Seat Test | 1.1 × Rated Pressure | Water | Leakage ≤ ISO 5208 Rate B (Metal Seat) |
| Low Pressure Seat Test | 5–6 bar / 80–90 psi | Air or Nitrogen | Leakage ≤ ISO 5208 Rate B |
Note: For metal-seated knife gate valves, a zero-leakage (bubble-tight) seal is NOT guaranteed. ISO 5208 Rate B or API 598 standard leakage rates apply. Optional soft-seat inserts available for zero-leakage requirements.
6. PERFORMANCE DATA
| Parameter | Specification |
|---|---|
| Service Medium | Water, Wastewater, Slurry, Pulp & Paper stock, Chemical fluids, Oil, Gas |
| Design Temperature | -29°C to +450°C (Dependent on packing and seat facing) |
| Max. Working Pressure | Class 150 (19 bar @ 100°C) / PN16 (16 bar) |
| Leakage Class | ISO 5208 Rate B (Metal Seat) / API 598 Standard |
| Flow Direction | Uni-directional (marked on body, arrow) or Bi-directional on request |
| Installation Position | Any (Horizontal recommended) |
| Operating Torque | Moderate to High (depending on media and pressure) |
| Cavity Purge | Body cavity can be cleared by flushing ports (optional) |
7. DIMENSIONS (Reference – MSS SP-81, Class 150 Lugged Type)
| DN (mm) | NPS (inch) | Face-to-Face L (mm) | Flange Drilling (ASME B16.5 CL150) | Approx. Weight (kg) |
|---|---|---|---|---|
| 50 | 2″ | 50 | 4 × 19mm on 120.7mm BC | 9 |
| 80 | 3″ | 50 | 4 × 19mm on 152.4mm BC | 13 |
| 100 | 4″ | 50 | 8 × 19mm on 190.5mm BC | 18 |
| 150 | 6″ | 60 | 8 × 22mm on 241.3mm BC | 32 |
| 200 | 8″ | 60 | 8 × 22mm on 298.5mm BC | 52 |
| 250 | 10″ | 70 | 12 × 26mm on 362.0mm BC | 80 |
| 300 | 12″ | 80 | 12 × 26mm on 431.8mm BC | 115 |
| 350 | 14″ | 90 | 12 × 29mm on 476.3mm BC | 165 |
| 400 | 16″ | 100 | 16 × 29mm on 539.8mm BC | 230 |
| 450 | 18″ | 110 | 16 × 32mm on 577.9mm BC | 305 |
| 500 | 20″ | 120 | 20 × 32mm on 635.0mm BC | 390 |
| 600 | 24″ | 140 | 20 × 35mm on 749.3mm BC | 550 |
For PN16 / EN 1092-2 drilling patterns, add 30–50mm to flange OD. Please contact factory for exact dimensional drawings.
8. OPTIONAL UPGRADES
| Option | Description |
|---|---|
| Hard Facing | Stellite 6 / Colmonoy / Tungsten Carbide overlay on gate edge and seat ring |
| Packing Material | PTFE, Aramid fiber, or High-temp graphite for specific chemical compatibility |
| Live Loading | Belleville disc springs on gland for continuous packing pressure |
| Purge Ports / Flush Connections | NPT or flange connections for body cavity cleaning |
| Soft Seat Option | Replaceable EPDM / NBR / PTFE seat insert for zero-leakage (temperature limited) |
| Actuation | Handwheel, Chainwheel, Bevel gear, Electric / Pneumatic / Hydraulic actuator |
| Certification / NACE | NACE MR0175 / MR0103, PED 2014/68/EU, SIL 2/3, Fire-safe |
| Anti-Blowout Stem | Upstream pressure retention design per API 609 (available) |
| Stem Extension | For underground or insulated pipeline applications |
| Position Indicator | Visual open/closed indicator on top yoke |
9. QUALITY CONTROL
-
100% chemical analysis and mechanical testing per heat number (PMI verification upon request)
-
100% DPT (dye penetrant) examination on all castings and gate edges; MT/UT/RT available on request
-
100% hydrostatic shell and seat tests per API 598
-
Dimensional inspection with calibrated CMM / laser tracker for large sizes
-
All 316 material passivated per ASTM A967
10. WARRANTY
12 months service life at minimum against manufacturing defects; free spares and maintenance instruction provided when required.
This technical data sheet is for reference purposes only. All specifications are subject to change without prior notice. For specific project requirements, please consult the manufacturer.
