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...
Features： Fully bore globe pattern design, lowest head loss while fully open Keep stable working condition even the flow rate close to zero High sens...
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.
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The manual valve is a valve operated by the handle and the hand wheel, and is a commonly used valve on the equipment pipeline.
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 ...
What is Kieselguhr Filter? What's the working principle of Kieselguhr Filter? The kieselguhr filter (Candle filter / Cake Filter) which we for customized for fluorine chemical plant six more lithium fluoride phosphate phosphorus process have been installed and working for two years
MINOTAUR series replaceable seat high performance butterfly valve
Double eccentric butterfly valves are widely used in modern water transmission and distribution systems where reliable sealing, low operating torque and long service life are required.
Compared with traditional concentric butterfly valves, double eccentric designs are better suited for large diameter pipelines, pump stations and municipal water infrastructure projects.
This engineering guide explains:
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ATHENA double eccentric butterfly valves are designed according to EN593 and EN1074 standards for municipal and industrial water pipeline applications.
1. What Is a Double Eccentric Butterfly Valve?
A double eccentric (double offset) butterfly valve is designed with two offsets between the shaft, disc and seat centerline. This geometry reduces direct friction between the disc and seat during opening and closing operations.
Compared with concentric butterfly valves, double eccentric designs provide:
For municipal water transmission systems, these advantages become increasingly important as valve size and operating frequency increase.
2. Why Double Eccentric Butterfly Valves Are Widely Used in Water Pipeline Systems
In modern water infrastructure projects, engineers often prioritize:
Double eccentric butterfly valves are widely selected because they can balance sealing performance and operational efficiency in large diameter pipelines.
Typical applications include:
For buried or flood-prone installations, ATHENA valves are available with optional IP68 gearbox configurations for submerged service conditions.
ATHENA double eccentric butterfly valves are engineered for municipal water transmission systems, pump stations and large diameter pipelines requiring reliable long-term shut-off performance.
3. Typical Engineering Challenges in Large Diameter Pipeline Projects
As pipeline diameter increases, valve operating conditions become more demanding.
Common engineering challenges include:
Selecting the correct valve type is therefore not only a product decision, but also a long-term operational reliability decision.
4. Understanding Operating Torque and Actuator Selection
Operating torque is one of the most important factors in butterfly valve selection.
Torque requirements are affected by:
Incorrect actuator sizing may result in:
For large diameter systems, engineers typically evaluate:
For detailed engineering considerations related to valve torque and actuator sizing, refer to the article below: "How to Calculate Butterfly Valve Torque for Actuator Selection in Large Diameter Pipelines"
5. Common Leakage Problems in Butterfly Valves
Leakage problems in pipeline systems are often not caused by manufacturing defects alone.
In many projects, leakage is related to:
Improper installation
Debris inside pipelines
Seat damage during commissioning
Excessive operating torque
Flange misalignment
Long-term seat wear
Understanding the root cause of leakage is essential for long-term pipeline reliability.
6. Installation Quality Directly Affects Valve Performance
Even high-quality butterfly valves can fail prematurely if installation procedures are incorrect.
Common installation mistakes include:
For DN500+ pipeline systems, installation quality can significantly affect:
To reduce installation-related failures in large diameter pipeline systems, see the following engineering article: "Common Butterfly Valve Installation Mistakes in Large Diameter Pipelines (and How to Avoid Them)"
7. Why Double Eccentric Butterfly Valves Are Better for Large Diameter Pipelines
Compared with gate valves or concentric butterfly valves, double eccentric designs offer several advantages in large diameter water systems.
Lower Operating Torque
Reduced friction helps simplify gearbox and actuator sizing.
Compact Installation Space
Butterfly valves typically require less installation space than gate valves.
Reduced Seat Wear
The offset design minimizes friction during operation.
Faster Opening and Closing
Suitable for pump station and isolation applications.
Lower Lifecycle Cost
Reduced maintenance and easier operation can lower long-term operational cost.
These factors make double eccentric butterfly valves one of the most widely used valve types in modern water infrastructure projects.
8. Maintenance Recommendations for Long-Term Reliability
To improve service life and reduce operational risks:
Conduct periodic operational testing
Preventive maintenance is significantly more cost-effective than emergency repairs in large pipeline systems.
9. Need Support for Valve Selection or Project Specifications?
If you are working on:
Municipal water transmission systems
Pump station projects
Water treatment facilities
Large diameter pipeline systems
Our engineering team can provide:
Valve selection recommendations
Torque and actuator guidance
Technical datasheets
Quotation support
Project-specific configuration recommendations
Send us your project requirements including:
Valve size (DN)
Pressure rating
Installation condition
Medium type
Automation requirements
*Our engineers will respond within 24 hours with project-specific support.
+86 138 8989 6699 
