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Bi-Directional Knife Gate Valve Manufacturer in Europe – Valvesonly Europe (Germany)
Valvesonly Europe is a leading Bi-Directional Knife Gate Valve Manufacturer in Germany, producing high-performance isolation valves for slurry, wastewater, pulp, and solids-laden service. Our valves are engineered for full shut-off in both flow directions, ensuring sealing integrity even under fluctuating pressures. Built in Germany to MSS-SP-81, EN 593, and PED 2014/68/EU, each valve is 100% tested to EN 12266-1 and supplied with 3.1/3.2 certification and full NDE traceability.
Function & Working
A bi-directional knife gate valve uses a machined gate sliding between two resilient or metal seat rings, sealing against both upstream and downstream pressures. This design eliminates the need for valve orientation and allows reliable operation in pipelines with reverse flow or variable flow conditions. The knife-edged gate cuts through solids and prevents clogging, making it suitable for abrasive and high-solid media.
Advantages
- True Bi-Directional Shut-off: Maintains seal integrity in both flow directions.
- Solids Handling Capability: Self-cleaning gate edge prevents accumulation of debris.
- Replaceable Seat Rings: Easy maintenance and extended service life.
- Surface Finish ≤ Ra 0.8 μm: Reduces wear and sealing friction.
- Wide Pressure Range: Designed for PN10–PN40; higher classes available on request.
Types Offered
- Wafer Bi-Directional Knife Gate Valve
- Lugged Bi-Directional Knife Gate Valve
- Flanged Bi-Directional Knife Gate Valve
- High-Pressure Slurry Bi-Directional Knife Gate Valve
Industries in Europe
Mining & Mineral Processing • Pulp & Paper • Wastewater Treatment • Desalination & Water Treatment • Marine & Offshore • Chemical Processing • Power Generation (Conventional & Biomass)
Materials (Body, Gate, Seat Rings, Stem)
| Category | Material | Standards / Grades | Typical Use |
| Cast Irons | EN-GJL-250 | EN 1561 | Municipal water, general service |
| Ductile Irons | EN-GJS-400-15 | EN 1563 | Water, sewage, moderate pressure slurry |
| Carbon Steels | WCB/WCC | ASTM A216 | Industrial process service |
| Stainless Steels | CF8/CF8M/CF3/CF3M | ASTM A351 | Corrosive slurries, wastewater |
| Duplex | CD4MCu / 1.4462 | ASTM A890 / EN | Chloride-rich water, seawater |
| Super Duplex | 5A (S32750), 6A (S32760) | ASTM A890 | Seawater, aggressive brines |
| Ni Alloys | Alloy 20, Hastelloy, Monel, Inconel | ASTM B/EN | Strong acids, offshore |
| Gate | 304/316 SS, Duplex, Super Duplex, Stellite 6 | ASTM A182/AWS | Wear & corrosion resistance |
| Seat Rings | SS, Stellite 6, EPDM, NBR, PTFE | — | Slurry, chemical, water |
| Stem | SS 304, SS 316, SS 410, Duplex | ASTM A182 | Strength, corrosion resistance |
Technical Specifications
- Size: DN50–DN1600 (2″–64″)
- Pressure: PN10–PN40 (higher on request)
- Temp: –20 °C to +200 °C (material-dependent)
- Ends: Wafer, Lug, Flanged (EN 1092 / ASME B16.5/B16.47)
- Standards: MSS-SP-81, EN 593, ASME B16.34, PED
- Testing: EN 12266-1 hydrostatic & seat leakage tests
- Actuation Options: Manual handwheel, gear operator, electric actuator, pneumatic actuator, hydraulic actuator
- Special Features: Replaceable seats, purge ports for flushing, reinforced gate for abrasive duty
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