Overview of Hard Seal Butterfly Valves:
A hard seal butterfly valve is designed with an eccentric metal sealing structure, where the sealing mechanism involves direct contact between two metal surfaces. This type of valve uses a metal sealing ring that can be replaced or upgraded, such as stainless steel plates combined with graphite composite materials for enhanced performance. The actuation methods available for hard seal butterfly valves include manual operation, worm gear drives, pneumatic actuators, and electric motors. These valves are typically installed horizontally in pipelines to ensure proper functionality and longevity.
The disc of a hard seal butterfly valve is positioned along the diameter of the pipe. As the valve operates, the disc rotates within the cylindrical passage of the valve body, moving around its axis by an angle ranging from 0° to 90°. When the disc reaches a 90° position, the valve is fully open, allowing maximum flow through the pipeline.
Key Features of Hard Seal Butterfly Valves:
Today, hard seal butterfly valves are widely used across various industries, including oil and gas, chemical processing, metallurgy, and hydropower. They serve as essential components for controlling on-off functions and regulating fluid flow in pipeline systems. In traditional butterfly valve designs, sealing is often achieved using rubber or PTFE (polytetrafluoroethylene) materials. However, these materials have limitations when it comes to high-temperature, high-pressure, or corrosive environments.
To address these challenges, advanced three-eccentric metal-sealed butterfly valves have been developed. In this design, the valve body and seat are connected as separate components, with the valve seat's sealing surface coated with heat-resistant and corrosion-resistant alloy materials. A multi-layer soft-seal ring is fixed onto the disc, improving sealing efficiency. Compared to conventional models, these valves offer better temperature resistance, smoother operation, and reduced friction during opening and closing. Additionally, the sealing performance is automatically enhanced as the torque increases during closure, leading to improved sealing and longer service life.
Yayi Valve Co., Ltd. specializes in manufacturing a wide range of butterfly valves, including hard seal, soft seal, high-temperature stainless steel, ventilation, wear-resistant dust, and insulated butterfly valves. If you're looking for reliable and high-performance solutions, feel free to contact us for more information!
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