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Double Offset Butterfly Valve

Double Offset Butterfly Valve Manufacturer

Our Double Offset Butterfly Valves are designed for high-pressure and high-temperature applications where standard concentric valves fail. The strategic displacement of the stem (the "double offset") allows the disc to lift off the seat immediately upon opening.

Technical Core: How the Double Offset Works

Offset Feature	Functional Benefit	Buyer Value
First Offset	Stem is behind the centerline of the sealing surface.	Allows for a continuous $360^\circ$ sealing ring.
Second Offset	Stem is eccentric to the vertical centerline of the pipe.	Disc "camming" action reduces seat contact to only the last few degrees of closure.
Result	Minimized Wear	Lower Total Cost of Ownership (TCO)

Critical Service Applications

Our high-performance valves are the standard for industries requiring zero-leakage and high cycle frequency:

Power Generation

Condenser cooling and steam extraction.

Chemical & Petrochemical

Handling of hydrocarbons, solvents, and corrosive gases.

District Energy

High-pressure hot water and steam distribution.

Oil & Gas

Refineries and midstream storage facilities.

Material Options for Double Offset Butterfly Valves

Component	Material Option	Key Advantage	Typical Application
Body	WCB Carbon Steel	High strength and cost-effective	Water treatment, HVAC, oil & gas
Body	CF8 / CF8M Stainless Steel	Excellent corrosion resistance	Chemical and marine systems
Body	Duplex Stainless Steel	High strength and chloride resistance	Offshore and desalination
Body	Hastelloy	Outstanding acid resistance	Chemical processing
Disc	Stainless Steel	Reliable wear and sealing performance	General industrial service
Disc	Duplex Stainless Steel	Enhanced durability in corrosive media	Offshore applications
Disc	Nickel Aluminum Bronze	Excellent seawater resistance	Marine industry
Stem	17-4 PH Stainless Steel	High strength and fatigue resistance	Automated valve systems
Stem	Monel K500	Superior corrosion resistance	Offshore and sour gas service
Seat	PTFE / RPTFE	Low torque and bubble-tight sealing	Chemical and low-temperature service
Seat	Metal Seat	High-temperature and wear resistance	Steam and power generation
Seal Ring	Stainless Steel + Graphite	Stable sealing under thermal cycling	High-temperature gas and steam

High Performance Pneumatic Butterfly Valve

Quality Assurance & Compliance

We provide full documentation and traceability required for industrial bidding and safety audits:

Design Standards: API 609 Category B, ASME B16.34

Testing Standards: 100% pressure tested to API 598 or EN 12266-1.

Fire Safety: Certified to API 607 / ISO 10497.

Low Emissions: Compliance with ISO 15848-1 for fugitive emission control (VOC reduction).

Material Traceability: MTRs (Material Test Reports) available for all pressure-retaining parts.

Our Certificate

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FAQ

Q: Can the Double Offset valve be used for throttling?

A: Yes. Unlike standard butterfly valves, the double offset design provides excellent control characteristics and can be used for both isolation and moderate throttling services.

Q: What is the typical life expectancy compared to a concentric valve?

A: In high-cycle applications, our double offset valves typically last 3 to 5 times longer due to the camming action that eliminates seat rubbing.

Q: Do you offer 3.1 Material Certificates?

A: Absolutely. We provide EN 10204 3.1 certificates with every shipment to verify chemical and mechanical properties for your QA department.

We're well-known as one of the leading double offset butterfly valve manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy bulk advanced double offset butterfly valve from our factory. If you have any enquiry about cooperation, please feel free to email us.

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