The Bidirectional Stainless Steel Knife Valve is designed for reliable shut-off and isolation in demanding flow systems involving slurry, pulp, powder, granular material, or corrosive fluids. Unlike unidirectional types, this bidirectional knife gate valve can seal in both flow directions—minimizing leakage and maximizing operational flexibility.
| NO | Part Name | Material |
|---|---|---|
| 1 | Body | Ductile Iron |
| 2 | Seat | EPDM |
| 3 | Gate | Stainless Steel |
| 4 | Packing Gland | Ductile Iron |
| 5 | Packing | Viton+PTFE |
| 6 | O-Ring Seal | EPDM |
| 7 | Support Plates | Steel |
| 8 | Position Indicator | SS304 |
| 9 | Stem | Stainless Steel |
| 10 | Stem Nut | Bronze |
| 11 | Yoke | Ductile Iron |
| 12 | Handwheel | Steel |
| 13 | Nut | Steel |
| 14 | Hood | Steel |
| 15 | Top Cap | Plastic |
Bidirectional stainless steel knife valve specification
| DN | SIZE Inch | HA | HB | L |
|---|---|---|---|---|
| 50 | 2” | 65 | 289 | 40 |
| 65 | 2.5” | 70 | 313 | 40 |
| 80 | 3” | 95 | 335 | 50 |
| 100 | 4” | 108 | 380 | 50 |
| 125 | 5” | 124 | 415 | 50 |
| 150 | 6” | 135 | 470 | 60 |
| 200 | 8” | 165 | 580 | 60 |
| 250 | 10” | 198 | 670 | 70 |
| 300 | 12” | 234 | 768 | 80 |
| 350 | 14” | 256 | 900 | 96 |
| 400 | 16” | 292 | 1014 | 100 |
| 450 | 18” | 308 | 1100 | 106 |
Key Features
Flow Direction: Bidirectional (zero-leakage in both directions)
Valve Size: DN50 – DN1200 (2” – 48”)
Body Material: Full Stainless Steel 304 / 316
Gate Material: SS304 / SS316 / Duplex steel optional
Seat Options: Metal-to-metal, PTFE, EPDM, Viton
Pressure Rating: PN10 / PN16 (custom options up to 25 bar)
Temperature Range: -20°C to +250°C depending on seal material
Face-to-Face: MSS-SP-81 or manufacturer standard
End Connection: Wafer / Lug / Flanged types
Actuation Options
Manual (handwheel or gearbox)
Pneumatic actuator (double-acting or spring return)
Electric actuator with modulating control
Hydraulic actuator (for high force applications)
All actuators can be fitted with position indicators, solenoid valves, limit switches, and manual override upon request.
Advantages
Bidirectional Sealing: Reliable shut-off in either flow direction, reducing the need for valve orientation
Corrosion Resistance: 100% stainless steel body and gate suitable for harsh or hygienic environments
Slurry-Proof Design: Self-cleaning gate and replaceable soft or metal seat minimize clogging and wear
Long Lifespan: Precision-machined components reduce leakage and increase cycle life
Maintenance Friendly: Easy disassembly and replacement of parts without pipeline removal
Typical Applications
Mining and tailings pipelines
Wastewater treatment (abrasive media)
Pulp and paper mills
Chemical and food processing
Power plant ash handling systems
Cement and bulk powder industries
Available Configurations
Pneumatic Bidirectional Knife Gate Valve Stainless Steel
Manual Bidirectional Knife Valve with SS316 Body
Flanged SS Knife Gate Valve with Dual Seal
Air Operated Stainless Steel Slurry Knife Valve
Quality Assurance
Our bidirectional stainless steel knife valves are manufactured under strict quality control standards and tested for:
Pressure seal integrity
Bi-directional leakage performance
Surface finish and dimensional accuracy
Corrosion resistance per ASTM / ISO standards
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Looking for a stainless steel bidirectional knife valve for your critical flow control needs?
Contact us now for model selection, datasheets, and competitive pricing.