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What Is API 609 Butterfly Valve?

An API 609 butterfly valve is a type of quarter-turn valve designed to regulate or isolate fluid flow.

The API 609 standard covers butterfly valves that can be used in various pressure classes and sizes, making them suitable for a wide range of applications, including those in the petroleum, natural gas, and related processing industries.

The API 609 standard, set forth by the American Petroleum Institute (API), specifies the design, materials, testing, and dimensions for butterfly valves that are used in flanged, lug-type, and wafer-type configurations.

In this guide, TIANYU VALVE, a professional API 609 butterfly valve manufacturer & factory in China, will take you through the design, materials, testing, and dimensions for API 609 butterfly valves.

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Overview of API 609 Standard Content

API 609 Butterfly Valves Design

The API 609 standard encompasses the design and fabrication of butterfly valves, detailing aspects such as types of connections to pipelines, valve structural designs, and the dimensions between face-to-face (FTF) of valves.

It specifies various forms of connections including wafer, flanged, lug, grooved, and welded butterfly valves.

In terms of structural design, the standard differentiates between centerline butterfly valves and eccentric butterfly valves, which include double and triple eccentric models.

For face-to-face dimensions (FTF), the standard is categorized into Series A and Series B; Series A applies to clamp and lug types, while Series B extends to clamp lug and flanged types, with the latter further classified into long and short structures.

API 609 Category A Butterfly Valves (Lug and Wafer type) Face-to-face Dimensions

API 609 Category A Butterfly Valves (Lug and Wafer type) Face-to-face Dimensions
Source: ZFA Valve

API 609 Category B Butterfly Valves Face-to-face Dimensions

API 609 Category B Butterfly Valves Face-to-face Dimensions
Source: ZFA Valve

API 609 Butterfly Valves Materials

  • WCB (Weldable Cast B-grade Carbon) complies with ASME B16.34
  • Cast iron/ductile iron per ASME B16.41
  • Bronze and other materials comply with ASME B16.24

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API 609 Butterfly Valve Inspection & Testing

At TIANYU VALVE, every API 609 Butterfly Valve undergoes the strictest testing to meet the standard. We assess various aspects of the valves, including dimensional data, materials, pressure testing, leak prevention, and more. And we can provide the testing report for our clients.

Benefits From Your Trusted API 609 Butterfly Valve Manufacturer & Factory – TIANYU VALVE

Price Advantage

We have our own industrial butterfly valve manufacturing factory, hence can lower expenses from the outset and across different stages of production so that we can provide our customers with competitive prices.

Short Lead Time

With over 14 years of experience in the industry, we excel at streamlining operations, enhancing workflow efficiency, minimizing bottlenecks, and managing resources and inventory effectively. This expertise ensures a swift turnaround from the moment your order is placed or a request is made to the delivery of the final product or completion of the service.

R & D capabilities

TIANYU VALVE R&D team works hard to understand what customers and the market need. We focus on every part of butterfly valves to make sure our products meet market and customer expectations and fit industrial applications.

Contact TIANYU VALVE to get your competitive edges now!

The Main Applications Of API 609 Butterfly Valve

Chemical Processing: They control the flow of various chemicals, including corrosive and hazardous substances, ensuring safety and precision in chemical plants.

Oil and Gas: Used extensively in pipelines, refineries, and processing plants for regulating the flow of oil, gas, and other petrochemicals.

Water and Wastewater Management: Essential for controlling water flow in treatment plants, distribution systems, and wastewater management facilities.

Power Generation: In power plants, they manage the flow of steam, water, and other fluids essential for cooling, processing, and operational efficiency.

HVAC Systems: Butterfly valves help in controlling air flow within heating, ventilation, and air conditioning systems, ensuring optimal environmental conditions.

Food and Beverage Production: Utilized in the processing of food and beverages to control the flow of liquids and maintain hygienic conditions.

Pulp and Paper Manufacturing: They regulate the flow of liquids and slurries in the production process, contributing to efficient operations.

Marine Applications: Employed in ships and offshore platforms for managing ballast water, cooling systems, and fuel handling.

No matter what purpose you purchase API 609 butterfly valves for, we can provide you with the most suitable butterfly valve products. If you have other customization needs for your butterfly valves, our more than 14 years of custom production experience can also meet your requirements.

People Also Ask Categories of API 609 Butterfly Valves

API 609 categorizes butterfly valves into Category A and B. Category A valves, typically concentric with a concentric disc and seat configuration, are designed for lower pressures and temperatures and are common in applications like water supply and HVAC systems. Category B valves, which may feature either eccentric or concentric disc configurations, are suited for higher pressures and temperatures, as seen in more demanding industrial processes.

Each type and design of API 609 butterfly valve serves specific operational needs, ensuring there’s a solution for nearly any fluid control or isolation application within the industrial sector.

For detailed specifications and selection guidance, consult TIANYU VALVE – your trusted API 609 Butterfly Valves manufacturer & factory who can provide insights based on specific operational parameters.

Differences Between Categories A and B

Category A Butterfly Valves: These are typically concentric, with the disc and seat aligned centrally. They’re best suited for lower pressure and temperature applications, making them a common choice for water and HVAC systems where operational demands are not as high. The focus here is on affordability and efficiency in less aggressive environments​.

Category B Butterfly Valves: Designed to handle higher differential pressures, these valves feature either an offset seat with an eccentric or concentric disc. The offset design minimizes seat wear, extending the valve’s lifecycle, which is crucial for applications with higher pressure and temperature demands, such as in the oil, gas, and chemical processing industries.

For more questions about API 609 Butterfly Valves, feel free to contact TIANYU VALVE!


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