BUTTERFLY VALVES
BUTTERFLY VALVES
Butterfly Valves
Full range of Butterfly Valves to API 609
- Size range ½” to 48”
- Concentric / Double Offset / Triple Offset
- Up to ANSI Class 600, PN10 to PN40
- Carbon Steel, Low Temp Carbon Steel, and Stainless Steel
- Other material grades including Alloy and Duplex Steels upon request
- Additional Testing RT, MT, DP, PMI Ect and Special Metallurgy available
- Firesafe certification to API 607 / ISO 10497 / BS 6755 Pt. 2
| Materials: | Cast Iron, Ductile Iron, WCB, LCB, LCC, CF8M, CF3M | ||||
| Design: | API 609 Face to Face: API609, BS EN 558, DIN3202, ISO 5752 Firesafe Certified to API607/EN ISO 10497 SIL 3 Rated – for functional safety Directive 94/9/EC for Explosive atmospheres (ATEX) Pressure equipment directive 97/23/EC (PED) |
||||
| Testing: | API 598 / EN 12266-I | ||||
| Design Options: | Wafer Pattern, Lugged & Tapped, Double Flanged | ||||
| Seat Materials: | Phenolic-backed Rubber – NBR, EPDM, Viton, Neoprene, Hypalon, Silicon, PTFE | ||||
High Performance Butterfly Valves by John Clark Valves
Butterfly valves play a vital role in fluid control systems, offering an economical and efficient way to regulate flow across different industries. Designed with a simple quarter-turn mechanism, these valves make it easy to open, close, or adjust the flow in pipelines. At the core of the design is a rotating disc that controls fluid movement within the valve body. Known for their durability and precision, high-performance butterfly valves are widely used in industries where reliability is essential. John Clark Valves provides a range of butterfly valves made from materials such as ductile iron with EPDM seats, ensuring suitability for applications in water treatment, food production, and chemical processing.
Our butterfly valves are available in wafer, lugged, and flange-mounted configurations, allowing flexibility for different system setups. They can be operated manually with a lever, through a gearbox, or with electric actuation, making them adaptable to various industrial needs. The design also ensures easy installation and maintenance, reducing downtime while extending the valve’s service life. Compared to other valve types, such as ball valves, butterfly valves offer a cost-effective alternative without compromising on efficiency or performance.
One of the biggest advantages of butterfly valves is their ability to provide secure sealing and accurate flow control. Whether fully open or partially closed, they regulate pressure and fluid movement effectively. The seat and disc are designed to handle different pressure ratings, ensuring reliable performance in various conditions. For potable water applications, WRAS-approved butterfly valves are available, meeting strict industry regulations. Their lightweight, compact build makes them easy to install and handle across different pipeline sizes.
John Clark Valves offers a comprehensive selection of butterfly valves to meet a wide range of industrial requirements. From standard wafer-type valves to tapped and lugged designs, each product is built for specific operational demands. Whether used for regulation or isolation, our butterfly valves enhance system efficiency with their robust construction and high-quality materials. Designed for longevity and dependable performance, they provide a cost-effective solution for industries requiring durable flow control equipment.
Frequently Asked Questions:
Butterfly valves are more affordable, lighter, and take up less space than ball valves, making them ideal for large pipelines and applications that require quick quarter-turn operation.
These valves are commonly found in food and beverage processing, water treatment, chemical plants, and HVAC systems due to their efficiency and adaptability.
They regulate flow by rotating a disc within the valve body. When fully open, they allow maximum fluid movement; when partially closed, they restrict flow; and when shut, they completely isolate the pipeline.
Butterfly valves come in wafer, lugged, and flange-mounted designs, using materials such as ductile iron, EPDM, and stainless steel to accommodate different pressures and applications.
Yes, high-performance models are built to withstand elevated pressure levels with reinforced seats and strong sealing mechanisms, making them suitable for demanding industrial settings.
The pressure rating of a butterfly valve indicates the maximum pressure it can safely handle in operation. This varies based on the valve’s design, materials, and intended use. For example, high-performance butterfly valves are typically rated for higher pressures and more demanding conditions, while standard models are suited for lower-pressure applications like water treatment and HVAC systems.
API 609 is the industry standard that defines the design, testing, and performance requirements for butterfly valves used in industrial applications. Valves that meet API 609 standards are built to ensure reliable sealing, proper flow control, and durability under various pressure and temperature conditions. Choosing a butterfly valve compliant with API 609 ensures it is manufactured to a recognised quality benchmark.
Butterfly valves operate with a quarter-turn rotation, meaning the disc moves 90 degrees from fully open to fully closed. When supplied in a fully open position, the valve allows unrestricted flow. Partial rotation reduces flow, while a full 90-degree turn closes the pipeline completely. This simple mechanism makes butterfly valves efficient and easy to operate, whether manually controlled or equipped with an actuator.