Concentric Butterfly Valve

LYV® Concentric Butterfly valve is manufactured to the highest standards, backed by our commitment to quality and excellence. We use advanced manufacturing processes and rigorous quality control to ensure each valve meets or exceeds industry benchmarks. Our valves are of exceptional quality, surpassing similar products in the industry in terms of durability, performance, and reliability.

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Product Introduction

LYV® is a professional concentric butterfly valves supplier in China. With 30 years of professional manufacturing experience, relying on advanced CNC processing and strict quality control, it ensures that the valves meet industry high standards in terms of durability, sealing reliability and delivery efficiency. Our butterfly valves are meticulously crafted and we adhere to strict production standards. Our sales team is committed to providing personalized services. We will customize concentric butterfly valve solutions to meet your specific requirements and expected applications.

This flanged end concentric butterfly valve adopts a classic centrally symmetrical structure. With the concentric design of the valve stem and the butterfly plate, it achieves rapid opening and closing as well as stable shut-off. The valve seat is made of high-performance elastic material, which forms a tight extrusion seal when the butterfly plate is closed, ensuring zero leakage performance under normal temperature and pressure conditions. The structure is simple and the flow resistance is extremely low, making it particularly suitable for water treatment, HVAC and general industrial pipeline systems.

Specifications

Size Range:

NPS 2”-48”; DN50-DN1200

Nominal Pressure:

150LB-600LB; PN6-PN64

Temperature Range:

-69℃~825℃（depends on design and material）

End Connections:

Flange; Butt-weld; Wafer; Lug-wafer

Body Materials:

ASTM A216 WCB/WCC; ASTM A352 LCB/LCC; ASTM A351 CF8/CF8M/CF3/CF3M; ASTM A890 4A/5A/6A;

Disc Materials:

ASTM A216 WCB/WCC; ASTM A352 LCB/LCC; ASTM A351 CF8/CF8M/CF3/CF3M; ASTM A890 4A/5A/6A;

Sealing Material:

VITON/NBR/EPDM

Seat Materials:

Integral; 304/316/STL overlayweld.

Stem Materials:

ASTM A182 F6A; ASTM A182 F304/F316/F304L/F316L; 17-4PH;

Design & Manufacture Standard:

API 609

Face-to-face Standard:

EN558-1

End Connection Standard:

ASME B16.4

Test & Inspection Standard:

API 598

Features

■ Compact Size and Lightweight

■ Easy Maintenance

■ Cost-Effective

■ Flexible Control

What is Concentric butterfly valve:

Butterfly valve is a type of quarter-turn valve that controls the flow of water by turning a lever or rotor on top of the valve. The most commonly used type is the concentric butterfly valve, also known as a zero-bias butterfly valve, where both the stem and the disc are located in the center of the valve body. It uses a rotating disk to control the flow of media, resulting in less resistance due to the thinness of the disc.

How does it work(sealing):

Concentric butterfly valve operates by adjusting the opening angle of the valve disk to control the flow of the medium. When the disk is parallel to the flow path, the medium can pass through unobstructed, and the valve is fully open. When the disk is perpendicular to the flow path, it completely blocks the flow, and the valve is fully closed. By rotating the valve stem, you can vary the disk's angle, thereby regulating the flow rate. In the closed position, the disk's edge presses tightly against the sealing ring on the valve body's inner wall. The elastic deflection of the sealing ring creates a seal, preventing leakage of the medium.

Why choose LYV®️ valves:

We produce flange type concentric butterfly valve for over 30 years. The workshop covers 13000 square meters and own more than 50 advanced CNC machines. Our engineers & production team will make sure your order delivers with high-quality and fastest time. We also care about valve shipping. The Concentric Butterfly Valve will wrap by bubble pouches or paper to ensure the paint will not be damaged. We also fixed valve by plywood stick after we put valve into the box. The plywood case will be painted with necessary marking to make sure the valve will not be damaged during shipping.

What's the difference between concentric vs eccentric butterfly valve:

Comparison Dimension	Concentric Butterfly Valve (Centerline Butterfly Valve)	Eccentric Butterfly Valve (Single/Double/Triple Eccentric)
Core Structure	The centers of the stem, disc, and valve body are aligned.	The center of the stem is offset from the center of the disc and/or the valve body.
Sealing Principle	Compression/Scraping Seal: Relies on the disc deforming the seat; constant friction during operation.	Off-Seat/No-Friction Seal: The disc quickly detaches from the seat when opening and compresses only when closing; minimal friction.
Wear & Service Life	Severe friction leads to faster wear and a shorter lifespan.	Significantly reduced friction results in less wear and a substantially longer lifespan.
Suitable Applications	Low pressure, ambient temperature, general sealing requirements (e.g., water treatment).	Broader range. Double Eccentric: Medium temperature & pressure. Triple Eccentric: High temperature, high pressure, critical sealing (e.g., key pipelines in oil & gas, chemical industries).
Sealing Materials	Primarily soft seals (rubber, PTFE), limited by temperature.	Wider selection. Double/Triple eccentric can use metal hard seals, resistant to high temperatures.
Operating Torque	Higher break-away torque; operation is relatively more demanding.	Lower operating torque; easier and lighter operation.