Stainless Steel Knife Gate Valve
The stainless steel knife gate valve is a knife gate valve made of stainless steel material. Its gate plate is made of stainless steel with excellent shearing performance, which is most suitable for hard‑to‑handle fluids such as slurry, powder‑granule materials and fibers.
Structural Features
The lifting‑type gate sealing surface can scrape off adhesives on the sealing surface and automatically clean impurities.
Stainless steel gate plate prevents sealing leakage caused by corrosion.
The hard full‑metal sealing surface guarantees sealing wear‑resistance performance.
There is no groove on the valve body sealing surface, so no material accumulation occurs to ensure flexible opening.
Short structure length saves raw materials and installation space, and effectively supports pipeline strength.
Scientific upper‑sealing stuffing box design ensures safe, effective and durable upper sealing performance.
The triangular bracket saves raw materials while maintaining required mechanical properties.
The guide blocks on valve body guide correct movement of gate plate, and four extrusion blocks ensure effective gate sealing.
Valve body reinforcing rib design improves valve body strength.
Stainless steel valve stem is durable, and double‑end bolts realize faster opening and closing operation.
Driving mechanism can be selected optionally.
Full‑closed structure is adopted for caliber above DN150 for better opening performance and leakage prevention.
Fluororubber sealing surface achieves good sealing effect and improves operating temperature range.
Rubber sealing surface is directly vulcanized inside valve body without falling off.
Classification of Stainless Steel Knife Gate Valve
Driving modes: manual, sprocket, electric, pneumatic, hydraulic, bevel gear, electro‑hydraulic, gas‑hydraulic and other driving modes.
Outline type: outside screw and yoke, inside screw and yoke.
Material: cast iron, cast steel, carbon steel, stainless steel, fluorine‑lined and so on.
Sealing type: hard seal, soft seal, single‑sided seal, double‑sided seal and other material sealing solutions.
Main Performance Specification & Component Materials
| Nominal Pressure (MPa) | Body Test (MPa) | Seal Test (MPa) | Operating Temperature | Applicable Medium |
| 1.0 | 1.5 | 1.1 | ≤100℃ | Pulp, sewage, coal slurry, ash‑slag water mixture |
| 1.6 | 2.4 | 1.8 | ≤425℃ | Pulp, sewage, coal slurry, ash‑slag water mixture |
| Valve Body & Bonnet | Seat | Stem | Sealing Surface |
| Stainless steel, carbon steel, grey cast iron | Carbon steel, stainless steel | Stainless steel | Rubber, PTFE, stainless steel, hard alloy |
Technical Parameters
Nominal Pressure: GB, ASME, JIS, BS, DIN standard (PN10, PN16, 10K, 150LB, TABLED, DIN)
Size Range: DN50～DN2000
Connection Type: Wafer
Driving Mechanism: Handwheel
Main Material: 304, 316, 316L
Gate Plate Material: 2Cr13, 201, 304, 316, 316L
Applicable Temperature: ≤120℃
Leakage Grade: Excellent (zero leakage)
Sealing Form: X
Packing Seal: Oil‑impregnated PTFE packing
Application Fields
Stainless steel knife gate valves are applied on oil, water and steam pipelines for coal preparation and slag removal in mines and power plants, municipal sewage treatment, food, paper‑making, pharmaceutical, petroleum, chemical industry. It is used to cut on‑off media such as cement slurry, gold ore powder, mineral sand, furnace slag, coal slime, paper pulp, wood pulp, tailings, fiber, dust, chemical‑treated sewage, sedimentation tank, asphalt, silo outlet, fruit juice and slaughter‑house wastewater.
