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
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.
Valves are the most common equipment in chemical companies. It seems easy to install valves, but if they are not implemented in accordance with the re...
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...
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 ...
Resilient-seated gate valve with bolted cover connection; made of ductile iron materials and with epoxy coating, designed as both clockwise and anti-c...
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
In water transmission and wastewater treatment projects, butterfly valves are widely used for flow isolation and regulation.
However, selecting the right valve design—especially between concentric and double eccentric butterfly valves—directly affects sealing performance, service life, and long-term maintenance cost.
Structural Difference: Why Eccentric Design Matters？
A concentric butterfly valve places the disc and shaft on the same centerline as the pipeline. While this design is simple, the disc remains in continuous contact with the seat during opening and closing, which leads to higher friction and faster seat wear.
In contrast, a double eccentric butterfly valve offsets both the shaft and the disc center. This configuration allows the disc to disengage from the seat immediately during opening, significantly reducing friction and minimizing wear on sealing components.
Performance Comparison in Water Applications
| Item | Concentric Butterfly Valve | Double Eccentric Butterfly Valve |
| Sealing wear | High | Low |
| Opening torque | Higher | Lower |
| Seat service life | Shorter | Longer |
| Suitability for large diameter | Limited | Excellent |
| Maintenance frequency | Higher | Lower |
For large-diameter pipelines and frequent operation conditions, double eccentric butterfly valves offer clear advantages in durability, reliability, and operating stability.
Why Double Eccentric Valves Are Preferred in Water & Wastewater Projects？
Municipal water transmission and wastewater treatment systems often operate under large pipe diameters, frequent opening and closing cycles, and strict leakage control requirements.
Double eccentric butterfly valves help reduce seat damage, maintain stable sealing performance over time, and lower overall maintenance costs. As a result, they are widely adopted by EPC contractors and system integrators for medium- and large-scale water infrastructure projects.
If you are evaluating butterfly valve options for water or wastewater systems, selecting the appropriate valve structure is critical to long-term system reliability.
Technical Support for RKSfluid Athena Double Eccentric Butterfly Valves
If you would like more information about Athena double eccentric butterfly valves, including specifications, engineering support, or project consultation, please feel free to contact our team.
You can reach our international sales department by phone at +86 (0)24 2318 0188-856, or +86 151 4027 2439, send an email to damon@rksfluid.com
, or leave us a message and our team will respond shortly.
+86 138 8989 6699 
