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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 – Wafer Butterfly Valve - Aluminum Alloy

Made from aluminum alloy, featuring Hard Back Ring (with a shock-absorbing) structure, which significantly improves durability and service life. Its excellent corrosion resistance and light-weight design reduce stress on the pipeline and enhance work efficiency.

4 or more Guide Holes are provided for easy and accurate installation.
(The ALDC12 + shock-absorbing seat (Water Type) model was officially recognized as a Korea Excellent Procurement Product (2022).)

Option 1.: Oil-Free & Oil Removal: For DI water / UPW
(cleanroom processed)

Option 2.: NBR Seat: For 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 Certification of Excellent product Certification of Green

Features and benefits

1. Body: 4 or more flange bolt Guide Holes provide accurate centering and simplify installation.

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: Disc made from Investment casting for a smooth surface that prevents seat damage. The hemispherical sealing edge minimizes torque and ensures a tight seal.

4. One-Piece Stem: Deformation-resistant design offering excellent sealing reliability.

5. Bushings & O-Rings: Equipped with O-rings, bushings, and V-packings to prevent shaft leakage and provide secondary sealing between the body and seat.

Characteristics of ALDC12 Aluminum Alloy

Excellent Corrosion Resistance
Forms a dense and stable oxide film that effectively protects against corrosion.

Light-weight
Approximately 70% lighter than steel or copper, reducing pipeline stress and improving work efficiency.

High Strength
With a tensile strength of 220–240 MPa, it offers excellent strength-to-weight ratio, making it suitable for automotive, railway, and aerospace structural applications.

Eco-Friendly Material and Process
Does not emit harmful substances during chemical reactions. The die-casting process minimizes the release of pollutants such as formaldehyde during production.

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
Size	2 " ~ 12"
Flange Connection	ASME 150
Flange Connection	PN 10
Temperature Range	EPDM (-20℃~120℃ )
Temperature Range	NBR (-10℃~80℃ )

Material Option

Material Option
Body	Aluminum Alloy
DISC	A351-CF8 / CF8M / CF3M
DISC	Monel, Duplex
Stem	SS420, SS431
Stem	SS316 / SS630
Seat	EPDM
Seat	NBR

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Catalog

IMO

Instruction Manual

Certification

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