Metal Seated Knife Gate Valve
When your application demands superior durability and reliable performance in extreme conditions, a metal seated knife gate valve delivers uncompromising shut-off reliability and extended service life. This advanced stainless steel metal seated knife gate valve is engineered for applications requiring maximum durability — whether you’re handling high-temperature processes, abrasive slurries, or corrosive media where resilient seats would fail. The precision-machined metal seat technology ensures consistent sealing performance even under thermal shock, pressure cycling, and abrasive conditions, while maintaining the superior cutting action of our proven knife gate design. With hardened seating surfaces and robust all-metal construction, it provides dependable performance in the most demanding industrial environments.
Ready to achieve long-term reliability in your extreme service applications? Contact us today for a metal seated solution engineered for your specific durability requirements. Let TOT Valve secure your operations with guaranteed performance.
The TOT Valve You Can Depend On – Metal-to-Metal Sealing When Extreme Conditions Demand Maximum Durability
When your process operates under extreme temperatures, pressures, or abrasive conditions that would destroy resilient seats, you need the superior durability of our metal seated knife gate valve. With precision-machined metal seating surfaces, this knife gate valve provides reliable shut-off performance, exceptional resistance to thermal cycling, and outstanding durability in abrasive service — all while maintaining the reliable cutting action that makes knife gates ideal for challenging media.
The metal seat design provides consistent sealing performance throughout extended service life, making it the preferred choice for extreme service applications where resilient seats cannot survive.
Why Metal Seated Knife Gate Valve Works for You?
- Precision-machined metal seats provide durable sealing performance in extreme conditions
- Multiple hardness options (13Cr, 316SS, 410SS, Stellite) for specific wear resistance requirements
- High-temperature capability operates reliably from cryogenic to +500°C applications
- Thermal shock resistance maintains sealing integrity through rapid temperature changes
- Corrosion-resistant stainless steel (SS304/316L/Duplex) ensures long-term performance in aggressive media
- Knife-edge gate cuts through fibrous materials, settled solids, and viscous media while protecting seats
- Replaceable seat rings allow field maintenance and refurbishment for extended service life
- Bi-directional sealing provides reliable shut-off regardless of flow direction
- Fire-safe design meets API 607 requirements for emergency shut-off applications
- Extended service life in abrasive and high-temperature applications where resilient seats fail
- Zero polymer degradation eliminates concerns about elastomer aging and chemical attack
Metal Seated Knife Gate Valve Main Technical Specifications & Performance
Extreme Service Reliability, Precision Metal Seat Technology, Knife Gate Valve
| Specification | Details |
|---|---|
| Design & Manufacturing Standard | MSS SP-81, AWWA C515, API 607 |
| Size Range | DN50 to DN1200 mm; NPS 2″-48″ (Customized to Your Request) |
| Pressure Ratings | PN6, PN10, PN16, PN25, ANSI 150-600Psi, 5K/10K, etc. |
| Working Pressure Classification | DN50–DN300: 25Bar; DN350–DN500: 16Bar; DN600–DN800: 10Bar; DN900–DN1200: 6Bar |
| Leakage Performance | Class IV per MSS SP-81 (≤4 ml/min/inch diameter) |
| Face-to-Face Standard | MSS SP-81, AWWA C515 |
| Flange Connection Standards | GB/T9113–2010, EN1092–2002, ASME B16.5–2013, ASME B16.47–2011, AS2129–2000, AS4087–2004, JIS B2220–2004 |
| Seat Testing Standard | MSS SP-81, API 598, EN 12266-1, API 607 |
| Body Materials | WCB, CF8, CF3, CF8M, CF3M, 4A, 5A, 904L, Duplex |
| Temperature Range | -196°C to +500°C (depending on seat material combination) |
| Seat Materials | 13Cr, 316SS, 410SS, Stellite 6, Inconel 625 |
| Temperature–Pressure Rating Standards | GB/T12224–2007, ASME B16.34–2009, ISO7005–1 |
| Applications | Petrochemical, Refining, Power Generation, Steel Mills, Cement, Mining, High-Temperature Process |
| Actuation Methods | Manual, Pneumatic, Electric, Gear Drive, Chain Drive |
Metal Seated Knife Gate Valve Main Components and Materials
| Part Name | Material Options | ||
|---|---|---|---|
| WCB | CF8 | CF8M | |
| Body | WCB | CF8 | CF8M |
| Gate | 13Cr/316 | 316SS | 316L/Duplex |
| Metal Seat | 13Cr/410SS | 316SS/Stellite | 316L/Stellite |
| Seat Retainer | 304 SS | 316 SS | 316L SS |
| Seat Ring | 13Cr | 316SS | Stellite 6 |
| O-ring | Viton | Viton/PTFE | Kalrez |
| Bonnet | WCB | CF8 | CF8M |
| Packing | Graphite | Graphite/PTFE | Graphite |
| Packing Gland | WCB | CF8 | CF8M |
| Yoke | Q235 | 304 | 316 |
| Stem | 13Cr | 316 | 316L/Duplex |
| Stem Nut | Bronze | Bronze | Duplex |
| Thrust Bearing | Stellite/SS | Stellite/SS | Stellite/SS |
| Handwheel | GGG30 | GGG30 | GGG30 |
| Stem Protector | 304 | 304 | 316 |
| Seat Springs | Inconel X750 | Inconel X750 | Inconel X750 |
| Fasteners | A193-B7 | A4-70 | A4-80 |
Advanced Metal Seat Technology
Precision Machining: CNC-machined seating surfaces ensure optimal contact and sealing performance
Hardness Matching: Optimized hardness differential between gate and seat for wear resistance
Surface Treatments: Optional hard-facing with Stellite or Inconel for extreme abrasion resistance
Thermal Expansion Compensation: Engineered clearances accommodate thermal growth differences
Corrosion Resistance: Matching or superior corrosion resistance to process media
Fire-Safe Compliance: Meets API 607 requirements for emergency service applications
TOT Valve Tailored for Your Extreme Service Applications – Premium Metal Seat Options
You can customize this metal seated valve for your exact durability requirements:
Seat Materials:
- 13Cr Stainless Steel: General high-temperature service, moderate abrasion, up to +450°C
- 316 Stainless Steel: Corrosive media resistance, chemical processing, up to +400°C
- 410 Stainless Steel: Enhanced hardness, abrasive service, up to +500°C
- Stellite 6: Maximum wear resistance, severe abrasion, up to +500°C
- Inconel 625: High-temperature corrosion resistance, up to +500°C
Seat Configurations:
- Standard metal seat: Single metal-to-metal sealing for most applications
- Dual hardness system: Soft/hard seat combination for optimal sealing and wear
- Replaceable seat rings: Field-serviceable seat inserts for extended valve life
- Lapped seat finish: Precision-lapped surfaces for improved sealing performance
Special Features:
- Position indicators: Visual/electrical feedback for valve position
- Seat injection ports: For sealant injection in critical applications
- Fire-safe certification: API 607 tested and certified designs available
- Cryogenic service: Special materials and design for low-temperature applications
Metal Seated Knife Gate Valve Dimensions
TOT valve can provide you with various sizes of metal seated knife gate valve. We have listed some metal seated knife gate valve sizes for PN25 for your reference.
If you don’t have the metal seated knife gate valve size you need, you can contact us immediately. Our professional sales manager will contact you and can provide you with exclusive ODM and OEM services.
| Size | A (mm) | B (mm) | C (mm) | D (mm) | E (mm) | F (mm) | G (mm) | H (mm) | Seat Type | Max ΔP (Bar) |
|---|---|---|---|---|---|---|---|---|---|---|
| DN(mm) | NPS(in) | |||||||||
| 50 | 2″ | 51 | 135 | 110 | 100 | 129 | 90 | 200 | 420 | 13Cr |
| 65 | 2-1/2″ | 51 | 155 | 110 | 115 | 147 | 90 | 200 | 460 | 13Cr |
| 80 | 3″ | 54 | 175 | 110 | 121 | 168 | 90 | 220 | 505 | 13Cr |
| 100 | 4″ | 54 | 163 | 110 | 138 | 192 | 90 | 220 | 575 | 13Cr |
| 125 | 5″ | 60 | 192 | 125 | 160 | 215 | 92 | 270 | 665 | 13Cr/316SS |
| 150 | 6″ | 60 | 216 | 135 | 185 | 245 | 92 | 300 | 745 | 13Cr/316SS |
| 200 | 8″ | 73 | 271 | 135 | 235 | 302 | 110 | 320 | 895 | 316SS/Stellite |
| 250 | 10″ | 73 | 335 | 145 | 300 | 355 | 110 | 370 | 1120 | 316SS/Stellite |
| 300 | 12″ | 79 | 381 | 165 | 350 | 401 | 110 | 420 | 1265 | 316SS/Stellite |
| 350 | 14″ | 79 | 436 | 185 | 400 | 465 | 122 | 470 | 1450 | Stellite |
| 400 | 16″ | 92 | 505 | 185 | 455 | 511 | 122 | 470 | 1610 | Stellite |
Seat Material Selection Guide
| Application | Recommended Seat | Temperature Range | Key Benefits |
|---|---|---|---|
| High Temperature Steam | 316SS/Stellite | Up to +500°C | Thermal stability, oxidation resistance |
| Abrasive Slurry | 410SS/Stellite 6 | -29°C to +450°C | Maximum wear resistance |
| Corrosive Chemicals | 316L/Inconel 625 | -196°C to +400°C | Superior corrosion resistance |
| Refinery Service | 13Cr/316SS | -29°C to +450°C | Hydrocarbon compatibility |
| Fire-Safe Applications | Stellite 6 | -29°C to +500°C | API 607 qualified |
| Cryogenic Service | 316L/Inconel | -196°C to +400°C | Low temperature toughness |
| Coal/Ash Service | Stellite 6/Inconel | Up to +500°C | Extreme abrasion/erosion resistance |
Performance Advantages & Testing
Extended Service Life: Engineered for 20+ years of operation in extreme conditions
Thermal Cycling Resistance: Validated performance through thousands of temperature cycles
Abrasion Resistance: Superior wear performance in particle-laden media
Fire-Safe Performance: API 607 tested for emergency shut-off capability
Pressure Cycling Durability: Maintains sealing through repeated pressure variations
Chemical Compatibility: Extensive testing with aggressive process media
Quality Assurance & Certification
Every TOT metal seated knife gate valve undergoes rigorous testing:
- Hydrostatic shell testing at 1.5x working pressure
- Seat leakage testing per MSS SP-81 Class IV standards
- Metal seat durability testing including thermal and pressure cycling
- Fire-safe testing per API 607 requirements where applicable
- Material hardness verification and metallurgical analysis
- Dimensional inspection of critical seating surfaces
Installation & Maintenance Benefits
Extended Maintenance Intervals: Metal seats require less frequent service than resilient seats
Field Serviceability: Seat rings can be replaced or refurbished in the field
Predictive Maintenance: Seat wear monitoring through torque trending
Refurbishment Capability: Seats can be re-machined and hard-faced for renewed service
Training Support: Specialized maintenance training for metal seated valves
Technical Documentation: Comprehensive seat selection and refurbishment guides
Environmental & Regulatory Compliance
Fire-Safe Certified: API 607 tested designs available for safety-critical applications
Fugitive Emissions: Meets TA-Luft and EPA standards for stem sealing
High-Temperature Service: Qualified for extreme temperature industrial processes
Pressure Equipment Directive: CE marked for European compliance
Quality Standards: ISO 9001 certified manufacturing processes
Material Traceability: Full documentation for critical applications
Contact TOT Valve today for technical consultation and competitive quotation on your metal seated knife gate valve requirements for extreme service applications.
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