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Coaxial valve structure

Oct 28,2024

A coaxial valve is a common type of valve, featuring a unique and powerful design with wide applications across various industries, including petroleum, chemical, food, pharmaceutical, and automotive. The structural characteristics and working principles of this valve determine its superiority in flow control and high-demand applications.

The basic structure of a coaxial valve consists of a valve body and an actuator, integrated into a single unit with the actuator's axis aligned with the fluid pipeline. This design not only maximizes space savings but also minimizes the influence of fluid pressure differential on valve opening pressure. The interior of the valve body incorporates a special coaxial structure, typically involving two spheres or similarly shaped components sealed along the same axis. This design enables the valve to simultaneously achieve high-pressure and high-flow control.

Coaxial valves are categorized into unidirectional and bidirectional structures. Unidirectional coaxial valves are suitable for single-direction flow, while bidirectional valves accommodate scenarios requiring dual-direction flow control. This flexibility allows coaxial valves to meet more diverse application needs.

In coaxial valves, the sphere and valve seat typically employ axial and projection sealing structures. The complementary shapes between the coaxial sphere surface and the valve seat surface achieve excellent sealing. When the valve is open, the pressure within the transmission pipe acts on the coaxial sphere, causing it to move along the valve seat, permitting fluid passage. Conversely, when the valve is closed, the pressure at the outlet connected to the pipe applies a reverse force to the coaxial sphere, pressing it firmly against the valve seat, thereby preventing fluid flow.

Another notable feature of coaxial valves is their maintenance-free operation. With only one moving part (piston rod) in the structure, eliminating the packing seal components between the valve stem and actuator found in traditional valves, as well as additional drive actuators, coaxial valves require no additional maintenance. This reduces operational costs and enhances valve reliability and lifespan.

Furthermore, coaxial valves feature a pressure-balanced design. The pressure of the medium to be controlled has minimal impact on switching behavior, maintaining consistent switching capacity to ensure safe switching. Coaxial valves maintain excellent performance under vacuum, low-pressure, and high-pressure conditions. This design also provides additional sealing pressure when the valve is closed, a so-called "16 bar back pressure on the seat," further enhancing sealing.

In summary, coaxial valves boast a unique and powerful structural design with advantages such as simplicity, reliability, and excellent sealing. Their wide range of applications and superior performance make them an ideal choice for flow control and demanding applications. With ongoing technological advancements and expanding application areas, coaxial valves will continue to leverage their unique advantages, providing strong support for the development of various industries.