Valves in the oil and gas industry need to be highly resistant and efficient. This is to accommodate the movement of liquids in such challenging conditions. Among all the choices, butterfly valves remain the best choice. The streamlined design and minimal maintenance, along with the speed, make it easier for them to operate effectively in different environments.
This guide on butterfly valve oil and gas provides information to help engineers select appropriate valve designs.
What is a Butterfly Valve?
A butterfly valve is a type of valve that can shut off pipeline flow simply by turning the handle to the required valve position. They are characterized by the presence of a disk called ‘butterfly’, which is attached to a center rod.
The open position of the valve is where the disc is aligned to the flow path, creating less resistance to the flow. Turning off the handle of the valve or actuator causes the disc to block the flow. It is due to this simplicity that makes them easy to operate and use in diverse industries like oil and gas.
Key Components:
- Valve Body: This is the primary element where all the inner components are mounted and linked with the piping.
- Disc: It offers control over the flow of fluid through opening or closing operations.
- Seat: The seal should fit perfectly to prevent any leakage.
- Actuator: The actuator can be a manual, electric, or pneumatic method for achieving the above function, which regulates the disc’s position.
How are Butterfly Valves Used in Different Oil and Gas Services?
Crude Oil and Natural Gas Pipeline Valves
With crude pipelines, the valves have to deal with grit and higher flow rates. The triple offset valves are applied in isolation duties and on-off functions. They feature a torque-seated metal seal that is resistant to wear.
With natural gas pipelines, shut-off performance has to be tight in order to minimize leakages. High-performance butterfly valves for oil and gas applications offer fire-safe protection. They are common in metering stations and main line blocks.
Gas Processing and Refined Products
For gas units, high-temperature separations are utilized. Valves with metal seating allow for thermal cycling without compromising on seal efficiency. They have the ability to deliver moderate throttling.
For refined product lines, either gasoline or diesel is used as the medium. The media are clean but remain flammable. Highly efficient double-offset valves offer bubble-tight seals.
Offshore Platforms and Storage
The offshore environment is highly corrosive because of the salt spray. The wholesale oil and gas butterfly valves for the offshore environment use duplex stainless steel. It is employed in seawater and firewater circulation.
Meanwhile, the concentric resilient-seated valve is suitable for application in storage farms. It is used for high-diameter, low-pressure conveyance of utility fluids such as pure water.
| Application Scenario | Recommended Valve Type | Primary Function |
| Crude Oil Pipelines | Triple-Offset (Metal Seat) | Isolation / On-Off |
| Gas Processing Units | High-Performance (Offset) | Throttling / Isolation |
| Offshore Firewater | Concentric (Rubber Lined) | On-Off |
| Tank Storage Inlets | Concentric or Double-Offset | Isolation |
What are the Selection Criteria for Oil and Gas Service?
The selection criteria for oil and gas services require careful technical evaluation, as choosing the wrong valve can lead to leaks or mechanical failure.
Medium Type:
- Determine if the fluid is crude, gas, or refined. Sour gas containing H2S or CO2 requires NACE MR0175-compliant materials.
Temperature & Pressure:
- Check ASME B16.34 pressure rating. In case of high pressure lines, like Class 300 and above, always use a triple offset valve structure.
Standards & Certificates:
- Dimensions of valves must follow API 609. In the case of fire safety, API 607 certification is mandatory. ISO 15848-1 is used for fugitive emissions control to protect the environment.
Seat Material:
- Use soft seat material such as PTFE/NBR for low temperature and clean media service. Use metal seats for high-temperature or abrasive applications.
Valve Structure Selection:
- Concentric Valve Structure: Suitable for moderate to low-pressure utility service.
- Double Offset Valve Structure: Most suitable for high-performance chemical or hydrocarbon applications.
- Triple Offset Valve Structure: Used where zero leakage is needed in extreme conditions.
| Take note… The butterfly valve weighs less and is cheaper compared to the ball valve, and its lightweight nature minimizes the structural support needs of the pipes. Furthermore, it contains fewer moving components, making maintenance easier. Nonetheless, ball valves or gate valves are recommended for use in cases where the pressure is high and there is an extreme demand. The ball valve offers a full flow path during pigging, while gate valves are commonly used in high-pressure situations. |
A Checklist: How to Select an Oil and Gas Butterfly Valve?
- Confirm service conditions: Check pressure, temperature, and media chemistry (H2S content).
- Determine structure: Select concentric for utilities or triple-offset for high-pressure hydrocarbons.
- Choose seal type: Opt for metal-to-metal seals if fire safety or high heat is a factor.
- Verify standards and tests: Ensure compliance with API 609, API 607, and fugitive emission rules. Oil and gas butterfly valve manufacturers must also follow strict quality protocols, including material traceability and hydrostatic and pneumatic shell testing.
- Check access: Evaluate the installation location for maintenance and actuator clearance.
Case Study Happened in Real Life
Petrobras Refinery Slurry and Cooling Operations (Brazil)
At a major refinery operated by Petrobras, engineers faced rapid valve deterioration within abrasive slurry oil and cooling water systems. Research indicates that interruptions in refinery cooling water distribution can create serious financial losses and major operational safety risks for facilities.
Engineers discovered that standard concentric butterfly valves failed prematurely because abrasive materials damaged the soft elastomeric valve seating surfaces rapidly. To resolve these issues, Petrobras adopted Stellite-faced metal-seated butterfly valves using advanced double-eccentric and triple-offset valve configurations for durability.
The upgraded valves provided tighter sealing performance while resisting thermal stress, particle erosion, and demanding refinery operating conditions during continuous production. After implementation, the refinery significantly extended valve service life, increasing mean time between failures from months to multiple operational years.
Conclusion
Choosing the right butterfly valve heavily depends on service risk. The triple offset valve can be used for high-pressure gases and crude oil applications. Whereas the concentric valves are normally used in the case of low-pressure utility and water applications. Nonetheless, the butterfly valve oil and gas should conform to API 609/607 for pressure resistance and fire safety.
CTGV is one of China’s leading oil and gas butterfly valve factories, specializing in high-performance and triple-offset designs. Our modern manufacturing equipment includes CNC machining and automated quality tests. Having ISO 9001 and API certificates, CTGV can provide offshore and refinery projects anywhere globally with durable and leak-proof valves.
Contact our engineering team today for a technical quote on your next project.
