Suited to fluids with solids and fibers
The sharp-edged gate plate closes the flow passage by cutting through buildup and fibers; it works reliably in fluids such as wastewater, pulp and sludge where conventional valves clog.
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Knife Gate Valves
Knife gate valves work by a sharp-edged gate plate closing directly through the flow passage. In fluids containing solids, fibers and sludge, the gate cuts through the buildup to achieve a complete shutoff — a solution for lines where conventional valves clog. As Denfor Endüstriyel, we supply single- and bidirectional-sealing knife gate valves, with manual, pneumatic and electric actuator options, matched to line diameter and fluid type.
Line diameterDN50 – DN600
BodyCast / stainless
GateSingle / bidirectional sealing
OperationManual / pneumatic / electric
Why it matters
What does a knife gate valve do?
It achieves a complete shutoff on lines where conventional valves clog, in fluids containing solids, fibers and sludge.
Achieves a complete shutoff with a sharp gate
The gate closes by physically cutting through solids built up in the line, which eliminates the risk of staying half-open or leaking.
Single or bidirectional sealing option
A single- or bidirectional-sealing type is chosen depending on whether the flow needs to be sealed in one direction or both.
Manual, pneumatic or electric actuator
It can be operated manually in the field, or via a pneumatic or electric actuator connected to the automation system.
Types
Sub-types of knife gate valves
All three close with a sharp gate; what sets them apart is the sealing direction and body material.
Single-direction sealing knife gate valve
The economical standard choice for lines where a fully sealed shutoff in one flow direction is sufficient.
- Single-direction sealing
- Economical solution
- Wastewater lines
Bidirectional sealing knife gate valve
Used on lines where pressure direction can change and the flow must be fully sealed in both directions.
- Bidirectional sealing
- Variable flow direction
- Process lines
Stainless-body knife gate valve
Built with a stainless steel body and gate instead of cast iron, for corrosive fluids or processes that require hygiene.
- Corrosion resistance
- Hygienic applications
- Food/chemical lines
Selection criteria
What data determines the right knife gate valve?
Selection isn't possible without the first two items. The rest determine the sealing direction and operation type.
ParametreNeden belirleyiciBizden istenen
Line diameter
Determined by the nominal diameter of the existing pipeline.
DN size
Fluid type
Solids ratio and fiber content determine the gate and gasket material.
Wastewater / sludge / fiber, etc.
Sealing direction
Whether the flow must be fully shut off in one direction or both.
Single direction / bidirectional
Body material
Cast or stainless is chosen based on a corrosive fluid or hygiene requirement.
Cast / stainless
Operation type
Whether manual or a pneumatic/electric actuated model is wanted.
Manual / actuated
Connection size and mounting location
Flange size and installation clearance.
DN size + mounting clearance
Teklif için elinizde şunlar varsa yeter
Hepsi olmasa da olur. Eksik kalanları sizinle birlikte tamamlarız.
Create a quote request- Line diameter (DN size)
- Fluid type (solids/fiber ratio)
- Sealing direction (single/bidirectional)
- Body material preference
- Whether manual or actuated is wanted
- Nameplate data of the existing valve (if a replacement)
FAQ
Questions from the field
The questions we hear most often when quoting knife gate valves.
What is the difference between a knife gate valve and a butterfly valve?
A butterfly valve is used for line shutoff in clean fluids; a knife gate valve solves clogging problems in fluids containing solids and fibers, because its gate cuts through the buildup to achieve a complete shutoff.
When is a bidirectional sealing model needed?
On lines where the flow direction can change with the process, or pressure can come from either side, a single-direction model cannot provide adequate sealing, so the bidirectional type is preferred.
Which industries use it?
It is used in almost every industry that carries fluids containing solids or fibers, such as wastewater treatment, pulp and paper, mining, cement and sugar production.
When should a stainless body be chosen?
If the fluid contains a corrosive chemical, or the process is food/chemical and requires hygiene, a stainless steel body and gate should be chosen instead of cast iron.
Do you only serve Istanbul?
No. While our office is on Istanbul's Anatolian side (Ataşehir), we supply and ship across Istanbul's European side, the surrounding provinces and the Marmara region, and Turkey as a whole — covering your equipment end to end, from a single source.
Next step
Let's pin down what you need, together
Share your line diameter and fluid type, and we'll work out the right knife gate valve for your line together.
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