Unidirectional Lever Operated Knife Gate Valve
WDL Valve QZU lever operated knife gate valves provide economical unidirectional shut-off for wastewater, pulp, mining and process slurry service.
Description
Unidirectional Lever Operated Knife Gate Valve
WDL Valve QZU lever operated knife gate valve is an economical and dependable solution
for unidirectional shut-off in industrial pipelines. Its gate blade presses against a
replaceable seat to create the seal, making it suitable for media containing solids,
fibres, sludge or slurry.
The valve is widely used in wastewater treatment, pulp and paper, power generation,
chemical processing, food processing and mining applications. In addition to the manual
lever version, the QZU knife gate valve can be supplied with handwheel, bevel gear,
spur gear, chain wheel, electric, pneumatic, hydraulic or electro-hydraulic operation.
Main Features
- Unidirectional sealing design.
- Lever-operated rising stem arrangement for straightforward manual operation.
- Replaceable elastomer or polymer seat options.
- Suitable for wastewater, slurry, pulp, fibre-containing and abrasive media.
- Stainless steel, duplex and super duplex gate blade options.
- Available with resilient or metal seat configurations.
- Compact wafer-style body for installation between flanges.
- Manual and automated actuation options available for different project requirements.
Technical Specifications
| Item | Specification |
|---|---|
| Model | QZU |
| Valve Type | Unidirectional lever operated rising stem knife gate valve |
| Size Range | DN50–DN1600 |
| Body Materials | WCB, CF8, CF8M, CF3, CF3M; stainless steel and duplex materials available on request |
| Gate Materials | SS304, SS316, SS316L, SS310, 2205, F53 and F55 |
| Seat Materials | EPDM, NBR, PTFE, Viton or metal seat |
| Packing Materials | PTFE, rubber, graphite, aramid fibre or high-water-based packing |
| Flange Standards | PN10, PN16, ASME B16.5 Class 150 and BS “D” / “E”; other standards on request |
Working Pressure
| Nominal Size | Maximum Working Pressure |
|---|---|
| DN50–DN250 | 10 kg/cm² (approximately 1.0 MPa) |
| DN300–DN400 | 6 kg/cm² (approximately 0.6 MPa) |
| DN450 | 5 kg/cm² (approximately 0.5 MPa) |
| DN500–DN600 | 4 kg/cm² (approximately 0.4 MPa) |
| DN700–DN1200 | 2 kg/cm² (approximately 0.2 MPa) |
Main Component Materials
| No. | Component | Material |
|---|---|---|
| 1 | Valve Body | 304, 316, 2205, F53 or F55 |
| 2 | Valve Seat | EPDM, NBR, PTFE, Viton or metal |
| 3 | Retaining Ring | WCB or 304 stainless steel |
| 4 | Gate Blade | 304, 304L, 316, 316L, 2205, F53 or F55 |
| 5 | Packing | PTFE + EPDM |
| 6 | Packing Gland | WCB, CF8, CF3, CF8M or CF3M |
| 7 | Yoke Plate | Q235A carbon steel or 304 stainless steel |
| 8 | Fasteners | Zinc-plated steel, 304 or 316 stainless steel |
| 9 | Stem | 2Cr13, 304 or 316 stainless steel |
| 10 | Stem Nut | Aluminium bronze |
| 11 | Stem Support | Q235A carbon steel |
| 12 | Bearing | Bearing steel |
| 13 | Handwheel | Ductile iron, grey iron or Q235A carbon steel |
Overall and Connection Dimensions
Unit: mm
| DN | L | ØO | ØD | ØS | f | M-1 | n-Ø | N-Ød | a° |
|---|---|---|---|---|---|---|---|---|---|
| 50 | 43 | 155 | 125 | 92 | 2 | 2-M16 | 2-Ø18 | — | 45° |
| 65 | 46 | 178 | 145 | 102 | 2 | 2-M16 | 2-Ø18 | — | 45° |
| 80 | 46 | 195 | 160 | 127 | 2 | 2-M16 | 2-Ø18 | 4-Ø18 | 22.5° |
| 100 | 52 | 225 | 180 | 148 | 2 | 2-M16 | 2-Ø18 | 4-Ø18 | 22.5° |
| 125 | 56 | 246 | 210 | 178 | 2 | 2-M16 | 2-Ø18 | 4-Ø18 | 22.5° |
| 150 | 56 | 280 | 240 | 202 | 2 | 2-M20 | 2-Ø22 | 4-Ø22 | 22.5° |
| 200 | 62 | 340 | 295 | 258 | 2 | 2-M20 | 2-Ø22 | 4-Ø22 | 22.5° |
| 250 | 68 | 400 | 340 | 308 | 2 | 4-M20 | 4-Ø22 | 4-Ø22 | 15° |
| 300 | 78 | 442 | 400 | 360 | 2 | 4-M20 | 4-Ø22 | 4-Ø22 | 15° |
| 350 | 78 | 505 | 460 | 416 | 2 | 6-M20 | 4-Ø22 | 6-Ø22 | 11.25° |
| 400 | 102 | 560 | 515 | 466 | 2 | 6-M24 | 4-Ø27 | 6-Ø27 | 11.25° |
| 450 | 114 | 615 | 565 | 520 | 2 | 8-M24 | 6-Ø27 | 6-Ø27 | 9° |
| 500 | 127 | 670 | 620 | 572 | 2 | 8-M24 | 6-Ø27 | 6-Ø27 | 9° |
| 600 | 154 | 780 | 725 | 652 | 2 | 8-M27 | 6-Ø30 | 6-Ø30 | 9° |
Typical Applications
- Municipal and industrial wastewater treatment
- Pulp and paper production lines
- Power plants and ash handling systems
- Chemical processing plants
- Food processing systems
- Mining, slurry and bulk solids handling
This is a unidirectional sealing valve. Dimensions, materials, pressure limits and flange
drilling are reference values. Final specifications shall be confirmed against the approved
WDL Valve technical drawing and project datasheet.
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