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Triple Offset Butterfly Valve | Structure, Advantages & Applications | PM-E

21/04/2026

What Is a Triple Offset Butterfly Valve? Structure, Advantages & Applications

What Is a Triple Offset Butterfly Valve?

A Triple Offset Butterfly Valve (TOV) is a high-performance butterfly valve specially designed for high temperature, high pressure, steam, oil & gas, chemical processing, and severe service applications.

Unlike concentric or double offset butterfly valves, the triple offset design uses three geometric offsets that eliminate seat friction during operation, extend service life, and provide bubble-tight shutoff performance.

It is an ideal replacement for gate valves and globe valves in many modern industrial systems.

Triple Offset Geometry

1st Offset

The valve stem is positioned behind the seat axis, allowing full sealing contact around the entire seat.

2nd Offset

The shaft centerline is offset from the centerline of the pipe and valve body, allowing interference-free opening and closing.

3rd Offset

The seat cone axis is offset from the shaft centerline, eliminating friction during operation and creating uniform compressive sealing around the full seat circumference.

Advantages of Triple Offset Design

✔ Friction-free opening and closing
✔ Long seat life
✔ Low operating torque
✔ Bubble-tight shutoff
✔ Suitable for high temperature service
✔ Suitable for high pressure service
✔ Fire-safe design available
✔ Excellent for frequent cycling
✔ Low maintenance cost

Working Principle

The valve operates by rotating the disc 90 degrees.

During opening, the disc moves away from the seat immediately, reducing wear.
During closing, torque forces the disc evenly against the seat.
Line pressure assists sealing performance.

Design Standards

Design

API 609 Category B
ASME B16.34

Face to Face

API 609 Category B
Wafer Type
Lugged Type
Double Flange Short / Long Pattern

Flange Standards

ASME B16.5 / B16.47
BS 4504
EN 1092-1
JIS B2220
Others on request

Pressure Ratings

Class 150
Class 300
Class 600
Class 900
Class 1500

Available Sizes

3” to 144”
DN80 to DN3600

End Connections

✔ Wafer Type
✔ Lugged Type
✔ Double Flanged Type

Optional Features

Anti-static Device
Cryogenic Design
Extended Stem
Gear Operator
Pneumatic Actuator
Electric Actuator
Special Design on Request

Testing Standards

API 598
ASME B16.104 / FCI 70-2
ISO 5208

Available Materials

Carbon Steel

A105
A216 WCB
WCC
WC6
WC9

Low Temperature Carbon Steel

A350 LF2
A352 LCB
LCC

Austenitic Stainless Steel

A182 F304
A182 F316
A351 CF8
CF8M
CF3
CF3M

Duplex / Super Duplex

A182 F51
F53
F55
A995 4A / 5A / 6A

Special Alloys

Inconel 625 (UNS N06625)
254SMO (UNS S31254)
Monel K400 / K500

Applications of Triple Offset Butterfly Valve

✔ Power Plants
✔ High Pressure Steam Lines
✔ Cement Plants
✔ Offshore & Onshore Oil & Gas
✔ Refineries
✔ Chemical Plants
✔ LNG / LPG Terminals
✔ Pulp & Paper Plants
✔ Large Industrial Water Systems

Comparison with Standard Butterfly Valve

Criteria	Standard Butterfly Valve	Triple Offset Butterfly Valve
Seat Type	Rubber / PTFE	Metal Seat
Temperature	Low to Medium	Very High
Pressure	Medium	Very High
Shutoff	Good	Bubble Tight
Service Life	Medium	Long
Severe Service	Limited	Excellent

Why Choose PM-E?

PM-E specializes in supplying high quality Triple Offset Butterfly Valves for industrial applications.

Our Commitments:

✔ Correct model selection
✔ Correct material supply
✔ Full CO/CQ documents
✔ Competitive pricing
✔ Fast delivery
✔ Technical support

Contact Us

PHUC MINH ENGINEERING CO., LTD
🌐 Website: kythuatphucminh.com
🌐 Website: pm-e.vn
📧 Email: info@pm-e.vn
📞 Hotline: +84 907 450 506
📞 Hotline: +84 902 720 814

Conclusion

A Triple Offset Butterfly Valve is the best solution for systems requiring tight shutoff, high temperature resistance, high pressure capability, and long service life. It is a preferred valve choice for modern industrial plants. Contact PM-E today for technical support and quotation.

Triple Offset Butterfly Valve

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