RKS fluid was founded in 1997. We are a production workshop for both foundry and machining, research & development center, and quality inspection cent...
Swing check valve is mounted with a disc that swings on a hinge or shaft. The disc swings off the seat to allow forward flow and when the flow is stop...
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Ⅰ Business area: fluid control products, technology and environmental protection products. Ⅱ Advanced CNC machining centers, professional process ce...
RKS fluid was founded in 1997. We are a production workshop for both foundry and machining, research & development center, and quality inspection cent...
Series: SASQUATCH series soft seal gate valve Port size: DN50 - DN900 (NPS2-NPS36) Pressure rating: PN10, PN16 Temperature: 0℃~80℃ Connection: Flange Certificate: CE ,WRAS,API,OHSAS18001:2007,ISO9001:2015
Series: HYDRA Series Resilient Seat Butterfly Valve Temperature: -29℃ ~ +120℃ Pressure: PN6, PN10, PN16(Class 150) Port Size: DN32-DN2400(NPS1 1/4-NPS96) Power: Manual, Electric, Pneumatic, Hydraulic
Butterfly valves have been around for a long time, and are used for a variety of applications. They made their first appearance during the 1930s, and have been utilized by several industries ever since. Often made out of cast iron, butterfly valve's name is based from the functionality of its disc.
The wafer butterfly valve is one of the most common types of valves in industrial pipelines. The structure of wafer butterfly valve itself is relatively small. It is only necessary to put the butterfly valve in the middle of the flange at both ends of the pipe, and use the stud bolt to pass through the pipe flange and the pair.
The manual valve is a valve operated by the handle and the hand wheel, and is a commonly used valve on the equipment pipeline.
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DIN standard now uses EN standard structure length
EN 558-1 PN flange connection valve construction length (instead of DIN 3202), EN 558-2 CLASS flange connection valve construction length (instead of BS2080), EN 12982 butt weld end valve construction length (instead of DIN 3202), DIN standard The length of the structure including the length of the API valve is basically the same as the length of the GB...
Resilient-seated gate valve with bolted cover connection; made of ductile iron materials and with epoxy coating, designed as both clockwise and anti-c...
The butterfly valve disc is a key component of the butterfly valve, which acts on closing and opening and closing. Butterfly valve seat and butterfly ...
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MINOTAUR series replaceable seat high performance butterfly valve
Avoid costly failures in large diameter pipeline projects. Learn the most common butterfly valve installation mistakes and how to ensure reliable long-term operation.
Why Installation Quality Matters More Than Valve Design?
In large diameter water pipeline projects, butterfly valve performance is not determined by design alone.
In many EPC projects, valves that meet all technical specifications still experience:
In most cases, these issues are not caused by manufacturing defects, but by installation mistakes on site.
For DN500–DN2000 pipelines, installation errors can directly affect:
Typical Installation Challenges in Large Diameter Pipelines
Installing butterfly valves in large pipelines is fundamentally different from small-size applications. Key challenges include:
These factors make correct installation procedures critical.
Common Installation Mistakes (and Their Consequences)
Mistake 1: Pipeline Not Properly Cleaned Before Installation
What happens:
Welding slag, sand, or debris remains in the pipeline
Result:
Damage to valve seat during first operation
Immediate or early-stage leakage
*This is one of the most frequent causes of sealing failure. Many leakage problems after installation are caused by these issues, More information you can refer to our guide on butterfly valve leakage problems and solutions.
Mistake2: Flange Misalignment
What happens:
Pipe flanges are not parallel
Valve is forced into position
Result:
Uneven sealing pressure
Disc cannot fully contact seat
Increased operating torque
In large diameter pipelines (DN800+), even small flange deviations can significantly increase torque and cause sealing failure.
Mistake 3: Incorrect Bolt Tightening Sequence
What happens:
Bolts tightened unevenly or sequentially
Result:
Distortion of valve body or seat
Localized leakage points
*Bolts should always be tightened in a cross pattern.
Mistake 4: Installing Valve in Closed Position During Mounting
What happens:
Valve is fully closed when flanges are tightened
Result:
Seat compression damage
Increased friction and wear
*Best practice: install valve in slightly open position.
Mistake 5: Lack of Proper Support During Installation
What happens:
Valve weight is supported only by pipeline
Result:
Mechanical stress on valve body
Long-term deformation
Mistake 6: Incorrect Flow Direction Installation (If applicable for certain designs)
What happens:
Valve installed opposite to recommended direction
Result:
Reduced sealing performance
Higher wear rate
Mistake 7: No Functional Testing After Installation
What happens:
Valve not tested before commissioning
Result:
Hidden issues remain undetected
Failure during operation
Best Practices for Reliable Installation
To ensure long-term performance, the following practices are recommended:
1. Pipeline Flushing Before Installation, Remove all debris and welding residue, Ensure clean sealing environment
2. Accurate Flange Alignment, Use alignment tools if necessary, Never force the valve into position
3. Controlled Bolt Tightening, Tighten in cross pattern, Apply uniform torque
4. Install Valve in Slightly Open Position, Prevent seat damage, Ensure proper disc positioning
5. Provide Temporary or Permanent Supports, Especially for DN500+ valves, avoid transferring pipe stress to valve
6. Perform Operational Testing, Open/close cycle test, Check sealing performance under pressure
Why Valve Design Still Matters During Installation
Even with correct installation, valve design plays a role in how tolerant it is to real-world conditions.
For example: Double eccentric butterfly valves reduce seat friction during operation, lower risk of sealing damage during installation and operation
* This makes them more suitable for large diameter water pipelines compared to concentric designs.
Installation Checklist for Site Engineers
Before commissioning, engineers should verify:
*A simple checklist can prevent most installation-related failures.
Need Installation Support or Valve Selection Advice?
If you are working on a large diameter pipeline project:
Send us your project parameters (DN, pressure, installation conditions), and our engineering team will provide:
– Torque calculation
– Installation recommendations
– Valve selection support
This helps avoid leakage, oversizing and costly installation failures.
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