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Welded butterfly valve

Welded butterfly valves feature a precision J‑shaped elastomeric sealing ring and a three‑eccentric, multi‑layer metal hard‑seal design. They are widely used in industrial pipelines—such as those in the metallurgical, power, petrochemical, water supply and drainage, and municipal construction sectors—for media with temperatures up to 425°C, serving to regulate flow and shut off fluid.

Category:

Pipe fittings / Valves / Vessel-mounted accessories

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Product Description

Welded butterfly valves feature a precision J‑shaped elastic sealing ring and a three‑eccentric, multi‑layer metal hard‑seal design. They are widely used in industrial pipelines—such as those in metallurgy, power generation, petrochemicals, water supply and drainage, and municipal infrastructure—for applications involving media with temperatures up to 425°C, serving to regulate flow and shut off fluid. Welded butterfly valves are available in cast steel, stainless steel, and chromium‑molybdenum steel versions. With their three‑eccentric structure, both the valve seat and the disc sealing surfaces are crafted from materials of varying hardness and stainless steel, providing excellent corrosion resistance and long service life. These valves can achieve bidirectional sealing and comply with the national GB/T 13927‑92 standard for valve pressure testing.

Features
1. Designed and manufactured with a novel structural configuration featuring a centerline‑type disc plate welded to a short‑length steel plate, this valve boasts a compact footprint, light weight, easy installation, low flow resistance, and high flow capacity. It also mitigates the effects of thermal expansion at elevated temperatures and offers effortless operation.
2. It features no connecting rods, bolts, or other internal components, ensuring reliable operation and a long service life. It can be installed in multiple positions and is unaffected by the flow direction of the medium.

Purpose
This butterfly valve is a non‑sealing type, widely applicable to pipelines in industries such as building materials, metallurgy, mining, and power generation, where the medium temperature does not exceed 300°C and the nominal pressure is 1.0 MPa, for purposes of connection, opening/closing, or flow regulation.

Structural features
This butterfly valve is designed and manufactured with a novel structure that combines a mid‑line disc with a short‑length steel plate welded together. It features a compact design, light weight, easy installation, low flow resistance, and high flow capacity, while effectively mitigating the effects of thermal expansion at elevated temperatures. Operation is smooth and effortless. The valve body contains no linkages, bolts, or other internal components, ensuring reliable performance and an extended service life. It can be installed in multiple orientations and is unaffected by the direction of media flow.

Working principle
The welded butterfly valve mechanism allows the disc to rotate freely within a 90° range, enabling it to open, close, or regulate the flow of the medium.
Currently, fluoropolymer-lined butterfly valves and rubber-lined butterfly valves, as components used to achieve pipeline system on/off control and flow regulation, have found extremely widespread application in numerous fields, including petroleum, chemical engineering, metallurgy, and hydropower. In existing butterfly valve technologies, sealing is typically achieved through a sealed structure, with sealing materials such as rubber or polytetrafluoroethylene. However, due to inherent structural limitations, these designs are not well suited for applications requiring high‑temperature resistance, high pressure, corrosion resistance, or wear resistance. A relatively advanced type of butterfly valve is the triple‑eccentric metal hard‑seal butterfly valve, in which the valve body and seat are integrally formed, and the seat’s sealing surface is overlay‑welded with heat‑ and corrosion‑resistant alloy material. Multiple layers of soft laminated sealing rings are fixed to the valve disc. Compared with conventional butterfly valves, this design offers superior high‑temperature resistance, effortless operation, frictionless opening and closing, and—when closed—the ability to compensate for seal integrity as the actuator torque increases, thereby enhancing sealing performance and extending service life.