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
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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
In large-scale water infrastructure projects, selecting the right isolation valve is a critical engineering decision. Whether the project involves municipal water transmission pipelines, pumping stations, irrigation networks, or water treatment facilities, EPC contractors must balance hydraulic performance, reliability, lifecycle cost, and maintenance requirements.
Among the available valve types, double eccentric butterfly valves have become one of the most widely specified solutions for medium and large-diameter water pipelines due to their compact structure, reduced operating torque, and long service life.
This article explains how EPC engineers evaluate and specify double eccentric butterfly valves during project design and procurement.
Water infrastructure systems often require valves in sizes ranging from DN200 to DN1800. In these applications, traditional gate valves can become heavy, expensive, and difficult to operate.
Double eccentric butterfly valves offer several engineering advantages:
For these reasons, double eccentric butterfly valves are frequently specified for transmission mains, distribution networks, and pumping facilities.
1. Valve Size Selection
The valve diameter is normally selected according to pipeline size.
For municipal and industrial water projects, common specifications include:
| Pipeline Size | Typical Valve Size |
| DN200–DN400 | Distribution Pipelines |
| DN500–DN1000 | Pump Stations & Transmission Lines |
| DN1200–DN1800 | Major Water Conveyance Projects |
ATHENA double eccentric butterfly valves are available from DN200 to DN1800, covering most large-diameter water transmission applications.
2. Pressure Rating Requirements
Pressure class selection depends on:
For most municipal water projects, PN10 and PN16 are commonly specified.
ATHENA valves are available in PN10 and PN16 configurations for water infrastructure systems.
Project specifications often require compliance with recognized international standards to simplify installation and replacement.
One commonly requested standard is:
EN558 Series 14
This standard helps ensure compatibility with existing pipeline layouts and replacement projects.
ATHENA valves are manufactured with face-to-face dimensions according to EN558 Series 14.
Selecting the proper actuator is just as important as selecting the valve itself.
EPC engineers generally evaluate:
Suitable for:
Suitable for:
Suitable for:
ATHENA valves are designed with ISO 5211 mounting interfaces to accommodate gearbox and actuator configurations.
Experienced EPC engineers do not evaluate valves solely on purchase price.
They also consider:
Lower operating torque can reduce actuator size and energy consumption.
The double eccentric design minimizes friction between the disc and seat during operation, helping extend sealing performance.
Large-diameter valves should allow efficient inspection and maintenance during shutdown periods.
Availability of replacement components and technical support is often included in supplier evaluation.
Double eccentric butterfly valves are commonly specified for:
Large-diameter transmission mains connecting reservoirs and distribution systems.
Isolation and flow control applications at pump suction and discharge locations.
Process isolation within filtration, treatment, and distribution systems.
Flow isolation and distribution control in agricultural water systems.
When evaluating butterfly valve suppliers, EPC contractors typically review:
A supplier that can provide complete technical documentation, actuator sizing support, and project-specific configurations is generally preferred during project procurement.
Specifying a double eccentric butterfly valve is not simply a matter of choosing a valve size. EPC engineers must evaluate pressure ratings, pipeline conditions, actuator requirements, lifecycle cost, and compliance with project standards.
For water infrastructure projects requiring reliable isolation of medium and large-diameter pipelines, double eccentric butterfly valves continue to be one of the most widely accepted engineering solutions.
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