Do You Know What to Pay Attention to When Purchasing Butterfly Valve?

Matters Needing Attention in Design and Selection of Butterfly Valve

For civil HVAC system, the following points should be noted in the design and selection of indicating butterfly valves:

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Balance Between Handle Butterfly Valve and Turbine Butterfly Valve

According to the engineering experience, the handle modulating butterfly valve is recommended when the pipe diameter is less than or equal to DN 100 mm and the worm gear seal butterfly valve is recommended when the pipe diameter is greater than or equal to DN 100 mm. The large pipe diameter of handle butterfly valve will not move the handle when switching due to corrosion and insufficient operation space. Because the handle butterfly valve is cheaper than the turbine butterfly valve, so you should consider comprehensively in the selection.

Balance Between Flange Butterfly Valve and Wafer Butterfly Valve

According to the engineering experience, on the premise of ensuring the installation quality, the clamp single offset butterfly valve is suitable for the pipe diameter less than or equal to DN300 and the pressure less than 1.6Mpa because the price is relatively cheaper, while the flange butterfly valve is suitable for the pipe diameter greater than DN300. Of course, for the pipe larger than DN300 and pressure less than 1.6Mpa, the double clip butterfly valve can also be used, but you need to fully consider the installation level and system pressure to prevent leakage.

Balance Between Hard Seal Butterfly Valve and Soft Seal Butterfly Valve

Both sides of the seal can be made of metal or other hard materials, which are called "hard seal". The sealing performance of hard seal is poor and it is difficult to achieve "zero leakage", but it has high temperature resistance, wear resistance, good mechanical performance, and high price. When one side of the seal is made of metal material and the other side is made of elastic non-metal material, it can be called "soft seal". It has good sealing performance and low price, but it is not resistant to high temperature, easy to wear, and poor mechanical property. Soft seal is recommended for HVAC system because of its low price, while hard seal is generally used in chemical, high temperature, and high pressure special conditions.

Precautions of Butterfly Valve in Purchasing Process

According to the standard GB / T- "Flange and Pair Clamp Connection Elastic Sealing Butterfly Valve" and engineering experience, the following points should be paid attention to when purchasing triple offset butterfly valve in civil HVAC system:

•The material of each part of the globe butterfly valve should be clear when inquiry, so as to avoid the price difference caused by different materials, thus affecting the fairness of procurement. The main components of intake butterfly valve are valve body, valve sealing ring (seat), valve plate, valve stem, valve stem bearing, and valve stem seal.

•The pipe with nominal pressure less than or equal to PN10 can be made of gray cast iron HT200, while the pipe with nominal pressure greater than PN10 should be made of ductile iron, carbon steel casting, or stainless-steel casting.

•The sealing ring of valve body is usually made of EPDM or NBR, which has good oil resistance.

•The common material of valve stem is 45 steel chrome plating or stainless steel (2Cr13).

•The valve plate is usually made of nodular cast iron chrome plated or stainless steel (304) because the air conditioning water system will rust after long-term operation, which will accumulate at the valve plate, thus affecting the switch and sealing.

A butterfly valve is a quarter-turn flow control device used to regulate, isolate, or throttle fluid within a piping system. The main component is a rotating disc that pivots in the center of the pipe to allow, restrict, or stop flow. When the disc is parallel to the flow, the valve is open. When turned perpendicular, it blocks the passage.

Contact us to discuss your requirements of Aluminum Turbine Butterfly Valve(pl,da,de). Our experienced sales team can help you identify the options that best suit your needs.

Butterfly valves are ideal when space is limited or when you need reliable, quick shut-off. Common use cases include:

• HVAC systems
   
• Water distribution
   
• Wastewater treatment
   
• Fire protection systems
   
• Chemical and food processing
   

Their streamlined body allows for easy installation in tight areas, and their simplicity makes them cost-effective compared to other valve types.

System pressure and temperature directly impact valve design. Higher pressures require more robust construction and better sealing technologies. For instance, triple-offset valves, such as the popular Vanessa Series 30,000 Triple Offset Valves shown below, are more suitable for high-pressure steam applications compared to concentric designs.

In addition, thermal cycling can affect seal performance. Look for valves with flexible seats or fire-safe certifications if operating in high-heat environments.

Manual, electric, pneumatic, and hydraulic actuators are all compatible with butterfly valves. Your choice depends on control requirements, system integration, and budget.
 

• Manual levers are cost-effective for low-use systems
   
• Electric actuators allow for remote or automated operation
   
• Pneumatic actuators are fast and suitable for on/off service
   
• Hydraulic actuators provide high force for large-diameter valves
   

Automated systems often benefit from valves with ISO mounting pads for easy actuator integration.


Installation Environment

Consider external factors that may influence valve performance:
 

• Indoor vs. outdoor exposure
   
• Accessibility for maintenance
   
• Potential vibration or seismic conditions
   
• Clean or hazardous locations
   

Butterfly valves with weatherproof, explosion-proof, or corrosion-resistant coatings may be required depending on the installation environment. Evaluate mounting space and orientation early in the selection process.

Selecting the wrong valve can cause system failure, costly repairs, and safety risks. Avoid these common pitfalls:
 

• Failing to consider material compatibility
   
• Using a manual valve for high-cycle or remote applications
   
• Overlooking temperature and pressure ratings
   
• Ignoring maintenance accessibility
   

Working with a trusted partner like Proconex ensures these risks are identified early.

 

Choosing the Right Supplier

Valve performance depends on both product quality and expert guidance. Choose a supplier that offers:
 

• Engineering support
   
• In-stock availability
   
• Application-specific recommendations
   
• Field services and lifecycle maintenance
   

Discover Our Butterfly Valves to find high-performance options for any flow control requirement. Our team helps clients navigate the complexities of valve selection through hands-on experience and industry knowledge.

Whether you’re selecting for corrosive environments, high-pressure steam, or food-grade media, we’ll help match the right butterfly valve to your needs.

The right butterfly valve enhances system efficiency, reduces maintenance downtime, and provides reliable control for years to come. By understanding your process conditions and operational needs, you can make an informed decision that pays off in both performance and longevity.

Proconex provides a wide selection of butterfly valves for isolation and flow control, backed by application support and technical expertise. Reach out today to streamline your valve selection process and get expert advice on fitting your specific application.

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