The opening and closing part of the knife gate valve is the knife /gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The manual knife gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces, The two sealing surfaces of the most commonly used mode gate valve form a wedge, and the wedge angle varies with valve parameters, usually 50. The gate of the wedge knife gate valve can be made into a whole, called a rigid gate; it can also be made A gate that can produce a small amount of deformation to improve its process characteristics and make up for the deviation of the angle of the sealing surface during the processing.This kind of gate is called an elastic gate.
When the knife gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, rely on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. The gate valve adopts forced sealing, that is, when the valve is closed, the gate must be forced to press against the valve seat by external force to ensure the sealing performance of the sealing surface
Area of application
Knife gate valve is suitable for viscous particles, often used in beverage, paper-making, pulp industry, industrial sewage, urban sewage treatment, chemical plants, bulk material transportation, fly ash treatment industries;
Technical Parameters /Properties of Butterfly valve
TYPE: | Wafer, lug, double flanged |
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SIZE & CONNECTIONS: | DN50 to D1800 |
MEDIUM: | Oil, Mud, material, viscous, granular fluid |
MATERIALS: | Cast Iron / Ductile Iron/ Carbon Steel / Stainless steel / Alu Bronze |
PRESSURE RATING: | PN10, PN16, 150LB, |
TEMPERATURE: | -30°C to 200°C |
SEAT/LINING: | Resilient seated NBR/EPDM/VITON, metal seated. |
CERTIFICATES & APPROVALS: | DNV-GL, Lloyds, DNV, ABS, BV Type Approval 3.1 & 3.2 Cert (on request) |
Standards
Material of Parts
PART NAME | Material |
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BODY | GG25/GGG40, WCB, CF3,CFCM,CF8,CF8M, |
SEAT | NBR/EPDM/VITON |
DISC | SS201/304/316, 2Cr13 |
PACKING | PTFE /Kelvar |
GLAND | GG25/GGG40,WCB, SS |
STEM NUT | QAL9-4 |
STEM | 2Cr13 |
YOKE | Q235A |
SUPPORT | Carbon Steel |
HAND WHEEL | HT250 |
BOLTS/NUTS | A193 B7 /A194 2H |
BEARING | Bearing Steel |
CAP | Steel |
Actuation
Types of knife gate valves:
The development of knife gate valves in China has gone through a short period of 20 years, and its use has expanded from ordinary fields to a wider range of industries. Coal preparation, gangue discharge and slag discharge from mines and power plants. It has developed into urban sewage treatment, and has developed from general industrial pipelines to professional pipeline systems such as food, sanitation, and medicine. The ultra-thin knife gate valve completely solves the large flow resistance of ordinary gate valves, flat gate valves, ball valves, globe valves, regulating valves, butterfly valves and other valves with its advantages of small size, small flow resistance, light weight, easy installation, and easy disassembly. , Heavy weight, difficult installation, large area and other difficult problems. After the emergence of knife gate valves, a large number of general shut-off valves and regulating valves have been replaced.
Work performance and installation of knife gate valve
Knife gate valve has the advantages of simple and compact structure, reasonable design, light material saving, reliable sealing, light and flexible operation, small size, smooth passage, small flow resistance, light weight, easy installation, easy disassembly, etc. It can work at a working pressure of 1.0MPa- 2.5MPa, normal work under the operating temperature of -29-650℃. The gate of the knife gate valve has a shearing function, which can scrape off the adhesion on the sealing surface and automatically remove the debris. The stainless steel gate can prevent the seal leakage caused by corrosion.
Installation and use of knife gate valve
Knife gate valve types: single clamp type knife gate valve, single clamp type slurry gate valve, single clamp type knife gate valve, Knife type mud gate valve, knife type slag discharge gate valve, single clamp type slurry gate valve.
Knife Gate valve features
Structural characteristics of knife gate valve
Related types of valves:
We can also produce gate valve, check valve, globe valve, and ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D,