Butterfly valves play a critical role in controlling flow across pipelines in nearly every industrial sector—from water treatment to petrochemicals. But not all butterfly valves are built the same. In fact, choosing the right type can mean the difference between smooth operation and costly system failure.
As a leading industrial valve manufacturer with decades of engineering expertise, Tiangong Valve is here to break down the three most important butterfly valve types you need to know: concentric, double offset, and triple offset butterfly valves.
In this guide, we’ll walk you through the structure, function, advantages, and best-use scenarios of each type—making valve selection simple, even if you’re just getting started.
What Are the Main Butterfly Valve Types?
Butterfly valves regulate flow using a rotating disc. Depending on how that disc is positioned relative to the stem and body, we classify them into three main types:
- Concentric butterfly valve (zero offset)
- Double eccentric butterfly valve (double offset)
- Triple eccentric butterfly valve (triple offset)
Each design suits specific pressure, temperature, and sealing requirements. Let’s explore them one by one.
Concentric Butterfly Valve: Simple, Reliable Flow Control
A concentric butterfly valve, or zero offset design, features a disc and stem positioned at the center of the valve body. Because everything lines up on the same axis, the disc stays in contact with the seat during the entire open-close cycle. This setup is common in general-purpose flow control.
Key Features:
- Soft-seated (typically rubber or PTFE)
- Suitable for low-pressure and temperature systems (typically up to 200 PSI and 400°F)
- Common in water supply, food processing, HVAC, and general service
Benefits:
- Cost-effective for clean and non-aggressive media
- Easy to operate and maintain
- Excellent shut-off in non-critical systems
Limitations:
- Not ideal for high-pressure or high-temperature applications
- Constant disc-seat contact causes wear over time
At Tiangong Valve, our concentric butterfly valves are built to international standards (API, DIN, JIS) and available in a wide range of elastomer seat materials for flexible usage across industries.
Double Eccentric Butterfly Valve: High Performance With Lower Torque
The double eccentric butterfly valve, or high-performance butterfly valve, improves upon the concentric design by offsetting the stem in two ways:
- Behind the center of the disc
- Off the centerline of the valve body
This configuration allows the disc to disengage from the seat early during opening, reducing wear and operational torque.
Key Features:
- Metal or PTFE seating
- Available in pressure ratings up to ANSI Class 600
- Compatible with corrosive and higher-temperature applications
Benefits:
- Longer seat life due to reduced friction
- Efficient flow control with lower torque requirements
- Ideal for moderate-pressure systems like HVAC, pulp & paper, and chemical processing
Limitations:
- Sealing relies on compression and contact, which can be sensitive to alignment
- Not suitable for extreme high-pressure shutoff where metal-to-metal sealing is required
Tiangong Valve manufactures double eccentric butterfly valves using high-grade WCB, SS316, and duplex stainless steel bodies. All valves are tested to meet stringent sealing and torque specifications.
Triple Eccentric Butterfly Valve: Zero Leakage in Demanding Systems
A triple eccentric butterfly valve goes one step further. Alongside the two axis offsets, the third offset lies in the geometry of the sealing surface—changing it from a circle to a conical ellipse. This design ensures a torsion-based, friction-free seal.
Key Features:
- Metal-to-metal sealing
- Zero friction during opening and closing
- Ideal for high-temperature (steam, gas) and high-pressure applications
Benefits:
- Zero leakage capability even in extreme environments
- Suitable for throttling and critical isolation in oil & gas, power, and refinery sectors
- Lower torque enables easier automation
Limitations:
- Higher cost due to complex design and tighter tolerances
- Overengineering for low-pressure or non-critical systems
Tiangong Valve’s triple eccentric butterfly valves are API 609 certified and engineered for harsh environments where reliability and zero leakage matter most. We also provide customized designs based on your exact operating conditions.
Choosing the Right Butterfly Valve for Your System
Not sure which type is right for your application? Here’s a quick comparison:
| Feature | Concentric | Double Eccentric | Triple Eccentric |
| Seat Type | Soft (PTFE, rubber) | Soft or metal | Metal-to-metal |
| Pressure | Low | Medium to high | High |
| Temp Range | Up to 400°F | Up to 600°F | > 600°F |
| Leakage | Minimal | Low | Zero |
| Friction | High | Moderate | None |
| Cost | Low | Medium | Higher |
Still unsure? Contact our engineers at Tiangong Valve for expert consultation based on your fluid, pressure, temperature, and installation needs.
Common Butterfly Valve Applications
- Concentric valves: potable water, air systems, low-pressure HVAC
- Double eccentric valves: chemical pipelines, cooling systems, sewage treatment
- Triple eccentric valves: steam lines, offshore platforms, refinery shutoff systems
Why Choose Tiangong Valve?
As a trusted butterfly valve manufacturer with over 40 years of experience, Tiangong Valve combines technical expertise, certified production, and global supply capabilities. Our valves are:
- API609, ISO9001, CE certified
- Available in sizes up to DN2400
- Manufactured with >13 quality checkpoints for near-zero defect rates
- Backed by full documentation and OEM services
From stainless steel to exotic alloys, soft seals to zero-leakage metal seats, we build valves that perform under pressure—literally.
Frequently Asked Questions (FAQ)
What is a butterfly valve used for?
A butterfly valve regulates flow in pipelines using a rotating disc. It’s widely used for shut-off and control in industrial systems.
What is the difference between concentric and eccentric butterfly valves?
Concentric valves have aligned centers; eccentric valves offset the shaft and disc to reduce friction and improve sealing.
Why use a triple offset butterfly valve?
Triple offset butterfly valves ensure zero leakage in high-pressure, high-temperature systems, making them ideal for critical isolation.
Conclusion: Upgrade With Confidence
Understanding the differences between butterfly valve types—concentric, double eccentric, and triple eccentric—empowers engineers and buyers to make informed decisions that impact system safety, longevity, and cost-efficiency.
At Tiangong Valve, we specialize in crafting high-performance butterfly valves for the most demanding industrial applications. Our valves are trusted by EPC contractors, OEMs, and distributors across five continents.
Explore our full butterfly valve range for your project today.
