Knife Gate Valve

📁 Technical Document PDF

Knife Gate Valve

Standards: MSS SP-81

DN 50 ÷ DN 500
PN6/10/16/25 or CL150



Knife Gate Valve Working Principle

When the knife gate valve is opened, the gate moves into the flow stream and seals off or reduces the flow by impeding the path. The open/closed state of the valve can be observed from the position of the gate – if it is visible above the valve body then it is open and likewise, if it is not visible then the valve is closed. Knife gate valves should only be used for applications requiring a completely open or completely closed position and should not be used to regulate flow unless they are designed for it.

The Benefits of Using Knife Gate Valves

Knife gate valves offer a number of advantages over regular gate valves as they can be easily actuated by mechanical, electrical or pneumatic means, and they are lightweight which makes them easier to transport, store, install and maintain. Knife gate valves are also very cost-effective and are used not only in pulp and paper production but are also widely used in municipal wastewater pumping stations and sewage treatment plants. Their sharpened blade makes them highly resistant to corrosion, and so they need fewer maintenance or even replacements.

Knife Gate Valves vs Gate Valves

Although both the wedge type gate valves and the knife gate valves are primarily designed for on-off services where the valve is completely opened or completely closed, there are a few differences between them. The knife gate can be raised using a spindle or a rising screw and the actuating mechanism can be manual or pneumatic/electrically activated. In addition, the knife gate valve is designed with a sharpened disc to better cut through slurry/viscous media, and it has a shorter face-to-face length compared to a gate valve, which is dimensionally wider.

Knife gate valve prices

The price of knife gate valves can vary greatly depending on the type and specifications of the valve, as well as the manufacturer. A good quality knife gate valve can be found for a reasonable price. It is important to consider the quality and durability of the valve when making a purchase decision.

Choose Venturi Valves for Knife Gate Valves

At Venturi Valves, we specialize in making highly efficient and reliable knife gate valves. We use only the best quality materials and components in our valves, and we strive to provide the best customer service. Our knife gate valves are designed to last and can easily handle slurry and viscous media. Our prices are highly competitive and our customer service team is always available to answer any questions or queries. If you are looking for top quality knife gate valves, then look no further and contact us today!

  • Wafet / Lug / Double Flanged Connection Types
  • Bidirectional wafer-design knife gate valve
  • One-piece cast body
  • Provides high flow rates with low pressure drop
  • Various seat and packing materials available
  • No retention area
  • Chemical plants , Pumping , Food Industry , Sewage treatment

Knife gate valves are designed mainly for on-off and isolation services in systems with high content of suspended solids. They are especially beneficial for handling slurry in addition to viscous, corrosive and abrasive media. Knife gate valves are used in some of the harshest environments, typically having a sharpened blade to cut through heavy liquids. As compared to wedge gate valves, a knife gate valve has a specific design featuring a knife edge that can enter the flow stream and, if necessary, use the edge of the gate to separate any materials that might prevent the valve from sealing completely.

  • Coal, slag discharge, sewage, water, oil, steam, grout, gold powder, ores, pulp, wood pulp, tailings, fibers, dust, chemicals, drain from sedimentation tanks, asphalt, bunker waste, fruit juices, cereals, slaughter plant waste and other media.
  • PN6/10/16/25 or CL150
  • Temperature up to 200
  • Cast Iron, Ductile Iron, Cast Steel or Stainless Steel, Dublex
  • Full port design
  • Respect to emission standards
  • Easy handling and maintenance
  • Stem packing replacement in
    working conditions
  • Metal Seating
  • Electric, hydraulic or pneumatic actuator
  • Position indicator
  • Extended stem
  • Locking device
  • Flanges and welding ends according to: EN, DIN, GOST, etc.
  • Other paint finishes are available upon customer’s request
  • Gate valve complete with counter flanges, bolting and gaskets.
  • Every produced valve was tested according to EN 12266-1 or API598.
Gate Valves according to EN 1984 PN 16 / PN 25 / CL150
Face-to face dimensions according to MSS SP-81 / customer specification
Flanged ends according to EN 1092-1, Tip B1
End-to-end dimensions according to EN 12982, Serie 15
Pressure tests according to EN 12266-1, Rate A or API 598
4 STEM X20Cr13
DN 50 65 80 100 125 150 200 250 300 350 400 450 500
L 40 40 50 50 50 60 60 70 70 96 100 106 110
H 286 316 342 382 415 458 575 676 776 906 1012 1098 1210
H1 63 70 92 105 120 130 160 198 234 256 292 308 340
Ø E 200 200 200 200 250 250 300 300 300 500 500 500 500
Weight ( Kg ) 6.2 6.8 8 9.9 12.7 16.9 27 42.7 59 119 144 166 203