API 609 Category A Butterfly Valve

API 609 Category A Butterfly Valve is designed for reliable flow control and shut-off in low- to medium-pressure pipeline systems across industries such as oil & gas, petrochemical, water treatment, power generation, and general industrial services. Manufactured in strict accordance with API 609 standards, these valves provide dependable performance, cost efficiency, and ease of installation.

In all cases where the Official API Monogram is applied, it is used in conjunction with API Certificate Number 609-0341, confirming compliance with API requirements covering design, materials, manufacturing, and testing. Category A butterfly valves are defined as manufacturer-rated cold working pressure (CWP) valves, making them suitable for applications where pressure ratings are based on ambient temperature service conditions.

API 609 Category A butterfly valve typically features a concentric disc and seat configuration, also commonly known as rubber-lined butterfly valves. This concentric design ensures uniform sealing, simple construction, and reliable operation in ASME Class 125 and Class 150 pressure classes. The resilient rubber liner provides excellent sealing performance while also offering good resistance to abrasion, making these valves suitable for slurry, wastewater, and mildly abrasive media.

The standard covers valve sizes ranging from NPS 2 to NPS 48, allowing flexibility for a wide range of piping systems. These valves are commonly supplied with wafer, lug, or flanged end connections, enabling easy integration into existing pipeline layouts. Due to their simple design and resilient seat materials, Category A butterfly valves are especially popular in low-pressure systems where frequent cycling is not required, as they typically have a lower cycle life compared to high-performance butterfly valves.

As a leading API 609 Category A Butterfly Valve manufacturer in China, we deliver high-quality valves with strict quality control, reliable sealing performance, and competitive pricing. Our products are trusted worldwide for their efficiency, durability, and compliance with international standards, making them a preferred choice for cost-effective flow control solutions.