The bottom of the knife-type gate valve plate has a knife-shaped oblique cut, which has the function of cutting off the medium. So that the valve is not blocked by media such as pulp with suspended particles and fiber materials, sewage, coal slurry, ash cement mixture, etc.
Application range of knife gate valve
The knife gate valve has the advantages of a simple and compact structure, reasonable design, light material saving, reliable sealing, flexible operation, small volume, smooth channel, small flow resistance, lightweight, easy to install, and easy to remove. It completely solves the ordinary gate valve, flat gate valve, gate valve, regulating valve, butterfly valve, ball valve weight, large flow resistance, large area, difficult to install difficult problems, can replace the general cut-off valve and regulating valve, can be in the working pressure 1.0MPa-2.5MPa, use temperature-29-550℃ normal operation.
The medium used for the knife gate valve
Gold ore powder, tailings, mineral sand, stabs, clay, sand, steel, steel, pulp, wood pulp, cement slurry, fiber, dust, powder, grains, chemicals, slaughtering plants wastewater, urban sewage, urban sewage, urban sewage, Sewer oil, asphalt, warehouse exports, fruits, grains, beer, beverages, drinks, oil products, steam, gas conveying, and power plant drainage, residue, etc.
Knife gate valve installation
1. Before installation, read the instruction manual carefully to carefully check the model, specifications, and other signs of the model as the same requirements.
2. When the installation of pipeline, it should correspond to the meter flow to the reasonable installation of the valve, and the operating part should be placed in the position of the valve’s ups and downs operation and wiring.
3. Before installation, the valve must be a comprehensive performance inspection, the sealing ring and the transmission site of the valve, the itinerary control mechanism of the pneumatic and electric devices, and the opening (location) indicator mechanism. All must be checked.
4. The inner cavity of the valve and the seal is not allowed to be attached. The valve should be cleaned and add lubricating oil (fat) to each rotating site.
5. The comprehensive performance inspection of the valve and the comprehensive performance of the electric device must be performed without the stuck without blight.
6. Check whether the connection bolts are evenly tightened during installation.
7. Do not hit the valve or arbitrarily twist the valve parts during installation.
8. The gas source of the moving valve must be guaranteed to supply sufficient gas (liquid) pressure.
Maintenance of knife gate valve
| Possible breakdown reason | Possible breakdown reason | Clearing of fault |
| Seal leakage | The sundries in the seal ring | Clean the seal surface |
| Seal ring damaged | Change the seal ring or grinding-in surface | |
| Upper seal leakage | Upper seal stuffing loose | Screwed stuffing or the bolt on the gland bush |
| Upper seal stuffing invalid | Oiling or changing the seal stuffing | |
| Flange end surface | Connection bolt is not tight evenly | Tight evenly the flange connection bolt |
| Flange washer invalid | Change the flange washer | |
| Valve switch jam | Drive device lack of the lubrication | Oiling the valve drive device |
| Valve switch failure | Drive device damaged | Change the drive device or ask the professional for maintainance |
The parameter range of the knife gate valve
Design and manufacturing standards: JB/T8691-1998, MSS-SP-81
Structure length standard: GB/T15188.2-94, MSS-SP-81
Flastic connection standard: GB/T9113.1-2000JB/T79-94JIS10K ANSIB16.5150LB EN1092 (DIN, BS.Nf) PN10PN16
Valve body material: Q235 Q345 16MN cast steel (WCB) stainless steel (CF8, CF8M, CF3M, 310S, 2520)
Sealing materials: Rubber (NBR, EPDM) tetrafluoride (VITON, PTFE) polyurethane (PU) stainless steel (CR13.304.316L) hard alloy (STL/K20/YG8) engineering ceramics (AL203)
Sealing structure: one-way seal, two-way sealing
Valve structure: glee or dark rod, penetrate or double open
Forms: Triangle, four -column, steel plate, dark plate type
Connection form: Yuan Frank, convex fate flange (plum), branches (pairs)
Nominal diameter: DN50 ~ DN2000NPS2*~ 80″(customize the special caliber valve according to customer needs)
Work temperature:-40℃～1000℃ (the specific selected temperature is subject to)
Nominal pressure: DN50 ~ 600(0.5MPa,1.0MPa,1.6MPa,2.5MPa, 10K, 150LB) DN700 ~ 1200(0.25MPa,0.6MPa,1.0MPa) DN1400 ~ DN2000 (no test)
Executive agency: hand wheel (DN50-DN600)
Pneumatic actuator (DN50-DN1000)
Hand-exhaustive actuator (DN50-DN600)
Electric actuator (DN50-DN2000)
Loval actuator (DN50-DN2000)
Electric hydraulic actuator (DN50-DN2000)
Brock and chain (DN50-DN2000)
Umbrella gear actuator (DN50-DN2000)
knife gate valve purchase instructions
1. When purchasing users, it is necessary to indicate the working conditions, fluid media, working pressure, medium temperature, nominal diameter and valve material and quantity of the valve.
2. When the required valve has special requirements, customers must provide drawing information and indicate in the purchase and sell contract, and the company is produced according to the customer’s request.
3. If the brand and model of the valve driver device have no special requirements, the standard model of the company is installed.
