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PRODUCTS / Concentric Butterfly valves / Rubber Seated Butterfly valves

Jeongdo Machinery's Concentric Rubber Seated Butterfly Valves are available in Wafer, Lugged, Grooved, and Flanged types, depending on the connection method.
They are designed to suit a wide range of operating conditions and are applicable for various fluids such as water, ultrapure water, oil-free systems, seawater, and chemicals, as well as different pressure requirements.

Concentric - Rubber Seated – Lugged Butterfly Valve

This Concentric Rubber Seated Butterfly Valve is suitable for a wide range of industrial applications.
The body is tapped to allow Dead-End Service, making it versatile for various installation conditions.

Option 1.
NBR seat for use with light oil service
Operator
Lever, Gear, Gear (with Lock Device), Gear (with Limit Switch), Gear Box Chain, Pneumatic actuator, Electric actuator
Certification
ISO 9001 CE/PED

Features and benefits

1. Body
Thread bolt holes are machined to match flange standards, allowing secure tightening from both sides of the pipe.
This design ensures stable installation and makes maintenance easier.
2. Seat

Hard Back Ring structure minimizes seat deformation and enhances sealing performance.

A patented Shock-absorbing ring inside the Back Ring reduces friction during disc rotation, significantly improving sealing and durability. (Patent No. 10-1996560)

3. DISC
Manufactured by Investment casting for a smooth, uniform surface that prevents seat damage.
The hemispherical sealing edge minimizes torque and provides a tight, reliable seal.
4. One-Piece Stem
Rigid structure with minimal deformation under pressure; offers excellent sealing reliability.
5. Bushings & O-Rings
Equipped with O-rings, bushings, and V-packings to prevent shaft leakage.
This secondary sealing system ensures complete isolation between the body and seat.

Easy Maintenance
Allows valve replacement or inspection without full system shutdown, as pressure can be maintained on the opposite side even if one flange is removed.

Dead-End Service
Can be securely installed at the end of a pipeline without additional downstream support, making future line extensions and modifications easier.

Installation Flexibility
Easily integrates with flanged piping systems, and is compatible with various pressure classes and industrial environments, providing wide application versatility.

Reduced Leakage Risk
The precise bolting structure ensures accurate alignment between the valve and the pipeline, significantly reducing the risk of leakage at the connection point for stable system operation.

TECHNICAL SPECIFICATIONS

Design Standards
Design Standards
Valve Design API 609 Category A
ASME B16.34
MSS-SP 67
Flange Drilling ASME B16.5
Face to Face API 609, ISO 5752
Specfication
Specfication
Body Type Wafer / Lugged / Flanged
Size 1 1/4 " ~ 64"
Flange Connection ASME 150
PN 10/16
Temperature Range EPDM (-20℃~120℃ )
NBR (-10℃~80℃ )
Material Option
Material Option
Body Cast Iron / Ductile Iron
A216-WCB
A351-CF8 / CF8M / CF3M
DISC A351-CF8 / CF8M / CF3M
Monel, Duplex
Stem SS420, SS431
SS316 / SS630
Seat EPDM
NBR

DOWNLOAD

Catalog
IMO
Instruction Manual
Certification
You may also check out other models.

NOTICE

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