Knife gate valve - Slide Valve
The knife gate valve, also known as a slide gate valve, is one of the most important components in industrial pipeline construction. It plays an essential role in regulating the flow of liquids, suspensions or other media by raising or lowering a plate, the so-called “gate valve”. Thanks to its slim design, the knife gate valve takes up very little space on the pipe, making it ideal for tight installation situations.
A particularly great advantage of this shut-off device is that an almost unimpeded flow is guaranteed when the gate valve is fully open, allowing the medium to flow with only minimal flow losses. The gate valve surfaces are usually wedge-shaped to ensure a perfect seal. Or they are also equipped with parallel wedges, which is useful when abrasive or fibrous media are used.
Knife gate valves can be found in a wide range of industries, from the paper and pulp industry to wastewater technology, the chemical and food industries and even mining. Thanks to their robust design and the possibility of using various sealing materials, they are a genuine and versatile choice. They are also available as manual, pneumatic or electrically operated shut-off devices, depending on their purpose, which means that they can be perfectly integrated into automated processes.
Knife gate valve: stainless steel and grey cast iron
sealing on one side
Pneumatic Actuator
DN100 - 4'' inch
Grey Cast Iron
Available, delivery time: in stock
Quick Release Lever
sealing on one side
Grey Cast Iron
DN150 - 6'' inch
Available, delivery time: in stock
sealing on both sides
Pneumatic Actuator
Grey Cast Iron
DN150 - 6'' inch
Available, delivery time: in stock
sealing on one side
DN150 - 6'' inch
Grey Cast Iron
Pneumatic Actuator
Available, delivery time: in stock
sealing on both sides
Pneumatic Actuator
DN100 - 4'' inch
Grey Cast Iron
Available, delivery time: in stock
sealing on one side
Grey Cast Iron
DN150 - 6'' inch
Handwheel (rising stem)
Available, delivery time: in stock
DN100 - 4'' inch
Grey Cast Iron
Handwheel (rising stem)
sealing on both sides
Available, delivery time: in stock
Handwheel (rising stem)
DN150 - 6'' inch
Grey Cast Iron
sealing on both sides
Available, delivery time: in stock
Handwheel (rising stem)
Grey Cast Iron
DN100 - 4'' inch
sealing on one side
Available, delivery time: in stock
Grey Cast Iron
Handwheel (non-rising)
DN250 - 10'' inch
sealing on both sides
Available, delivery time: in stock
Grey Cast Iron
DN150 - 6'' inch
Handwheel (rising stem)
sealing on one side
Available, delivery time: in stock
sealing on both sides
Pneumatic Actuator
Grey Cast Iron
DN200 - 8'' inch
Available, delivery time: in stock
DN150 - 6'' inch
sealing on one side
Pneumatic Actuator
Grey Cast Iron
Available, delivery time: in stock
Pneumatic Actuator
Grey Cast Iron
DN200 - 8'' inch
sealing on one side
Available, delivery time: in stock
sealing on both sides
Grey Cast Iron
Handwheel (rising stem)
DN200 - 8'' inch
Available, delivery time: in stock
Grey Cast Iron
Handwheel (rising stem)
DN150 - 6'' inch
sealing on both sides
Available, delivery time: in stock
Quick Release Lever
sealing on one side
DN100 - 4'' inch
Grey Cast Iron
Available, delivery time: in stock
Grey Cast Iron
Pneumatic Actuator
sealing on one side
DN100 - 4'' inch
Available, delivery time: in stock
sealing on both sides
Pneumatic Actuator
Grey Cast Iron
DN200 - 8'' inch
Available, delivery time: in stock
sealing on one side
Grey Cast Iron
DN150 - 6'' inch
Handwheel (rising stem)
Available, delivery time: in stock
Sliding gate valves: Robust solutions for demanding applications
Knife gate valves, also known as knife gate valves, are robust and versatile shut-off valves that are used in many branches of industry. The choice of material, be it stainless steel or grey cast iron, depends on the specific requirements of your system and the media to be conveyed. Due to their high resistance and flexibility, knife gate valves are particularly suitable for fibre-bearing media, slurries, granulates, pastes and even for applications with a high degree of contamination.
A key advantage of slide valves is their flexibility. Various seals such as NBR, EPDM or metallic variants provide a reliable seal, even under difficult conditions. In addition, integrated wipers ensure that the valve plate remains clean, which significantly reduces maintenance work. For even higher resistance requirements, special seal designs such as PTFE-Synt./NBR/PTFE-Synt. or PTFE-Synt./EPDM/PTFE-Synt. are available.
Slide valves also impress with their variety of actuation types. A handwheel (rising or non-rising) enables simple manual control. Pneumatic double-acting actuators or electric AUMA actuators are ideal for automated processes. Solenoid valves ensure precise control, while the entire system benefits from a robust construction designed for durability and efficiency.
Thanks to their versatile properties, knife-gate valves are indispensable in areas such as the chemical industry, wastewater treatment and food production in order to increase efficiency and ensure the integrity of systems. In the chemical industry, for example, they are used to handle aggressive media, while in wastewater treatment they reliably control sludge and fibrous materials. In food production, they ensure hygienic processing of pastes and other viscous substances. Knife-gate valves therefore play a central role in various processes and make a decisive contribution to the smooth running of industrial applications.
FAQ about the knife gate valve
- Body: The main structure that houses the gate valve and the flow channel.
- Gate valve: The moving part that opens and closes to control the flow.
- Seat: Provides a sealing surface for the gate to ensure a tight seal.
- Stem: Connects the gate valve to the actuator (manual or automatic).
- Actuator: Mechanism for moving the gate valve, which can be manual (handwheel), pneumatic, hydraulic or electric.
- Mining Pulp and paper
- Waste water treatment
- Food and beverage industry
- Chemical processing
- Bulk solids technology
- Biogas plants & more
- Effective for handling slurries and solids: The knife edge can cut through thick media without clogging.
- Low cost and simple design: These valves are generally less expensive and simpler in design than other valve types.
- Minimised pressure drop: When the valve is fully open, it provides a straight flow path with low resistance.
- Easy maintenance: The simple design facilitates disassembly and repair.
- Not suitable for high-pressure applications: They are generally not suitable for high-pressure applications.
- Limited to on/off operation: Knife gate valves are not ideal for throttling or regulating the flow.
- Sealing problems: They cannot close tightly under all conditions, especially in high-pressure or vacuum applications.
- Regular inspection: check regularly for wear, especially on the gate valve and seat.
- Lubrication: Ensure that the spindle and other moving parts are properly lubricated to prevent corrosion and ensure smooth operation.
- Cleaning: Remove all debris and dirt from around the gate and seat to prevent clogging and ensure a good seal.
- Replacing worn parts: Replace worn or damaged parts immediately to prevent leaks and maintain functionality.
- Stainless steel: For corrosion resistance and durability.
- Cast iron: For general purpose applications with less corrosive media.
- Nodular cast iron: Offers higher strength and impact resistance than cast iron.
- Special alloys: For handling aggressive chemicals and high-temperature applications.
- Type of media: make sure the gate valve material is compatible with the fluid or slurry.
- Pressure and temperature: Check the pressure and temperature ratings of the gate valve to ensure they meet the application requirements.
- Size and flow requirements: Match the valve size to the piping and flow rate.
- Operating mode: Determine whether manual, pneumatic, hydraulic or electric actuation is required.
- Industry standards: Ensure that the valve fulfils the relevant industry standards and certifications for your application.