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PRODUCTS / Eccentric Butterfly valves / Double Offset Butterfly valves

The Double Offset Butterfly Valve from Jeongdo Machinery—also known as a High-Performance Butterfly Valve—features a double-offset design, where the stem is offset from the disc center (1st offset) and the valve body centerline (2nd offset).
This structure enables reliable operation in high-temperature and high-pressure applications. Depending on fluid temperature, the valve is available with either RTFE seat or metal seat options. It is also manufactured in Wafer, Lugged, and Flanged types to suit various piping systems.

Eccentric - Double Offset – Wafer Type

Through Jeongdo Machinery's patented technology, the restoring force of the seat is enhanced, improving sealing performance in the reverse direction. An integral stopper is applied to prevent excessive disc movement, thereby minimizing seat damage and extending product lifespan.

RTFE seat stands for Reinforced PTFE, which is a composite material made of PTFE (Polytetrafluoroethylene) mixed with glass fiber and molybdenum.

The valve design complies with API 609 standards, ensuring reliable performance and international compatibility in high-performance butterfly valve applications.

4 or more Guide Holes ensure easy installation.

Operator: Gear, Gear (with Lock Device), Gear (with Limit Switch), Gear Box Chain, Pneumatic actuator, Electric actuator

Certification: ISO 9001 CE/PED API607 ISO 15848-1

Features and benefits

1. One-Piece Stem: Minimizes deformation under pressure, providing excellent sealing performance and structural stability.

2. Gland: Allows packing compression to be adjusted without removing the actuator, using hex nuts to enhance sealing performance.

3. Packing: Utilizes PTFE and graphite materials to effectively prevent shaft leakage.

4. Stem Bearings: Features SS316-backed, PTFE-lined bearings to reduce friction and provide secure stem support.

5. Seat: Compatible with PTFE or RTFE seats, offering excellent chemical resistance and sealing reliability.

6. Taper Pins: Securely fasten the disc to the stem using taper pins for enhanced mechanical integrity.

6. Integral Stopper: An integral stopper in the valve body prevents disc over-rotation, protecting the seat and stem from damage.

6. Stem Retainer: A snap-ring type retainer holds the disc in position on the stem, enabling smooth and stable rotation.

TECHNICAL SPECIFICATIONS

Design Standards

Design Standards
Valve Design	API 609 Category B
	ASME B16.34
	MSS-SP 68
Flange Drilling	ASME B16.5, ASME B16.47
Face to Face	API 609
Face to Face	ISO 5752

Specfication

Specfication
Body Type	Wafer / Lugged / Flanged
Size	1 1/4 " ~ 64"
Flange Connection	ASME 150 / 300
Flange Connection	PN 10/16/25/40
Temperature Range	RTFE (-29℃~200℃)
Temperature Range	Stainless Steel (-29℃~350℃)

Material Option

Material Option
Body	Ductile Iron
	A216-WCB
	A351-CF8 / CF8M / CF3M
DISC	A351-CF8 / CF8M
DISC	Monel, Duplex
Stem	SS420
Stem	SS630 (17-4PH)
Seat	RTFE
Seat	Stainless steel

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Catalog

IMO

Instruction Manual

Certification

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