Offset Butterfly Valves: Zero, Double, Triple Compared | BVC

Understanding Offset Butterfly Valves: Zero, Double, and Triple Comparisons

What Are the Key Differences Among Zero, Double, and Triple Offset Butterfly Valves?

Choosing the correct valve is crucial for effective operation in any system that controls liquid flow. You might be asking yourself how butterfly valves function and what sets them apart. Each offset butterfly valve has its unique functionalities and advantages. Explore our insights to determine which butterfly valve will best assist you!

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Triple Offset Butterfly Valves

Triple offset butterfly valves (TOV) feature three distinct offsets, enabling a conical shape between the disc and seat. Primarily utilized in applications requiring a tight shut-off, high temperatures, or robust sealing surfaces that ensure zero leakage (soft seat) or rated leakage (metal seat), these valves excel in challenging environments.

They offer low maintenance and prolonged valve life as there are no clogging issues due to cavities between sealing components; the disc only contacts the seat in the final one-degree movement. Ideal for high-temperature gases and oils exceeding 150 PSI, TOVs are also inherently fire-safe and meet API-607 standards.

Double Offset Butterfly Valves

Known as high-performance butterfly valves, double offset butterfly valves possess two offsets from the center, creating a cam-like action during operation. These valves find application in numerous sectors, including:

• Oil and gas
• Pulp and paper
• Power generation
• HVAC
• Chemical processing
• Shipbuilding
• Water/wastewater treatment

They are rated for higher pressure than zero offset valves (ANSI Rated) and feature adjustable stem packing, reducing emissions and leakage.

Zero Offset Butterfly Valves

Zero offset butterfly valves are designed for liquid and gas applications operating up to 400°F and 250 PSI. Both the stem and disc are centered in the valve seat, which in turn is centralized in the valve body. These valves can manage a range of materials, including chemicals and food products, while keeping the media away from the body due to the seat covering it.

When selecting a valve for your operation, reaching out to experts can be invaluable. Our specialists at Butterfly Valves and Controls are ready to help you identify the valve that best meets your requirements.

Double Offset vs Triple Offset Butterfly Valves

In recent years, eccentric butterfly valves have made significant inroads, standing against traditional industrial valves like globe and ball valves for critical applications. Though many understand the basic concept of butterfly valves, confusion often arises regarding the distinctions between double and triple offset valves and their proper applications.

Comparing Double and Triple Offset Butterfly Valves

Interested in learning more about the 2-Offset Butterfly Valve? Get in touch for an expert consultation!

Working Mechanisms of the Valves

Both valve types employ a similar operating principle, but with distinct movements. The double offset butterfly valve utilizes line pressure to create a bubble-tight seal, while the triple offset valve operates more like a globe valve, utilizing a cone mechanism for sealing.

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