A knife gate valve datasheet contains important technical information that engineers, maintenance teams and procurement departments need when selecting or replacing a valve.
At first glance, a datasheet can look complicated.
However, most of the information has a specific purpose.
Understanding the main fields can help you determine whether a valve is suitable for your pipeline before you place an order.
It can also prevent costly mistakes during procurement.
What Is a Valve Datasheet?
A valve datasheet is a technical document that describes the characteristics of a particular valve.
Depending on the manufacturer and valve series, it may include:
- Valve size
- Pressure rating
- Body material
- Gate material
- Seat material
- Temperature limits
- Connection dimensions
- Flow direction
- Actuator details
- Weight
- Standards
- Application information
The exact information varies between manufacturers and valve designs.
1. Valve Size
One of the first specifications to check is valve size.
Valve sizes are commonly expressed using:
- DN
- NPS
- Nominal diameter
The valve size normally needs to match the pipeline design.
However, simply selecting a valve because it has the same nominal size as the pipe is not enough.
Engineers should also confirm the connection dimensions and installation requirements.
2. Pressure Rating
The datasheet should identify the applicable pressure rating or pressure information.
This needs to be compared with the actual system requirements.
Check:
- Normal operating pressure
- Design pressure
- Maximum pressure
- Temperature
- Pressure surges
Do not assume that two valves with the same nominal size have the same pressure capability.
3. Valve Body Material
The body material can influence durability and application suitability.
Material selection depends on the environment and media.
For example, a valve installed in a clean-water application may face different material requirements from one exposed to abrasive mining slurry.
The datasheet should therefore be considered alongside the process conditions.
4. Gate or Knife Material
The gate is the moving component that travels through the valve.
Its material and design can affect:
- Wear
- Corrosion resistance
- Cutting ability
- Service life
- Compatibility with the media
This becomes especially important when the valve handles solids, fibres or abrasive materials.
5. Seat Material
The seat is another critical specification.
Depending on the valve design, different elastomers or sealing materials may be available.
The correct choice can depend on:
- Temperature
- Chemicals
- Solids
- Abrasion
- Media compatibility
A seat that performs well in one application may not be suitable for another.
6. Flow Direction
Some knife gate valves are designed for specific flow directions.
Others can provide bidirectional service.
This distinction matters during installation.
CMO Africa offers both unidirectional and bidirectional knife gate valve configurations across its product range.
Always confirm the manufacturer’s instructions for the specific valve series.
7. Actuator Information
A valve may be manually operated or automated.
Common actuator options include:
- Handwheel
- Pneumatic actuator
- Electric actuator
- Hydraulic actuator
If the valve is automated, the datasheet may include actuator requirements.
These can include:
- Air pressure
- Torque
- Stroke
- Fail position
- Control requirements
Correct actuator selection is important for reliable operation.
8. Face-to-Face Dimensions
Face-to-face dimensions determine how much space the valve occupies between the connecting pipeline components.
This is particularly important when replacing an existing valve.
If the dimensions differ significantly, modifications may be required.
Before ordering a replacement valve, compare the existing installation with the new valve’s dimensional drawing.
9. Connection Details
The datasheet may specify:
- Flange dimensions
- Drilling pattern
- Bolt arrangement
- Connection type
- Pressure class
These details should match the pipeline specification.
An apparently suitable valve can still create installation problems if the connections are incompatible.
10. Temperature
Temperature can affect both metallic and non-metallic valve components.
Elastomers, seals and packing materials have operating limits.
Therefore, always provide the manufacturer with the expected process temperature.
This is particularly important when the valve handles hot process water, chemicals or industrial fluids.
How Do You Know If the Valve Is Suitable?
Do not evaluate the datasheet one line at a time.
Look at the complete application.
For example:
Valve size: DN300
Media: Abrasive slurry
Pressure: 10 bar
Temperature: 40°C
Solids: High concentration
Operation: Frequent
Actuation: Pneumatic
The manufacturer can then assess the complete duty and recommend the appropriate configuration.
Why Datasheet Accuracy Matters
A valve datasheet is not just a purchasing document.
It can become part of the project’s technical record.
Accurate valve information can assist with:
- Engineering
- Procurement
- Installation
- Commissioning
- Maintenance
- Spare-parts planning
- Future replacement
For large mining projects, maintaining accurate valve documentation can save significant time years after the original installation.
Final Checklist
Before approving a knife gate valve, check:
☐ Valve size
☐ Pressure rating
☐ Temperature
☐ Media
☐ Solids concentration
☐ Body material
☐ Gate material
☐ Seat material
☐ Flow direction
☐ Actuator
☐ Connection dimensions
☐ Installation orientation
☐ Applicable standards
If any important information is missing, ask the valve supplier before placing the order.
Final Thoughts
A knife gate valve datasheet provides the technical information required to evaluate a valve for a particular application.
The key is to look at the specifications as a complete system.
Valve size alone does not determine suitability.
Pressure alone does not determine suitability.
The correct selection comes from matching the valve configuration to the actual process conditions.
Need Help With Valve Selection?
Send CMO Africa your application information and the team can help identify a suitable valve configuration for your project.