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Coaxial valve structure

Aug 06,2024

As a highly efficient, compact, and multifunctional valve structure, coaxial valves play a significant role in industrial production, mechanical control, and chemical processing. This article will provide a detailed analysis of coaxial valves from aspects including their structural characteristics, working principle, application fields, and advantages.

Structural Characteristics of Coaxial Valves:

The core feature of a coaxial valve lies in its unique structural design, integrating the valve body and actuator, with the actuator's axis coinciding with that of the fluid pipeline. This design not only significantly saves installation space but also minimizes the impact of fluid pressure difference on the valve's opening force. Specifically, coaxial valves adopt a balanced structure design, with the valve seat, control tube, and valve drive located on the same base axis. This compact layout allows the valve to maintain stable performance even under high pressure, high flow rate, and complex operating conditions.

The internal structure of a coaxial valve typically includes the valve body, valve seat, valve ball, valve stem, and actuator. The valve ball is connected to the valve stem via a threaded connection. When the actuator (such as a handle or electromechanical device) drives the valve stem to move up and down, the valve ball moves accordingly, controlling the sealing and opening state between the valve seat and the valve ball. In addition, the coaxial valve adopts a straight-through flow path design. The valve has no throttling element internally, and the inner wall of the flow path is smooth, further reducing flow resistance and improving fluid transmission efficiency.

Working Principle of Coaxial Valves:

The working principle of a coaxial valve is relatively simple and intuitive. When the valve needs to be opened, the actuator pulls the valve stem upward, causing the valve ball to move away from the valve seat, forming a flow passage, allowing fluid to flow from the inlet to the outlet side through the valve body. Conversely, when the valve needs to be closed, the actuator pushes the valve stem downward, and the valve ball tightly contacts the valve seat, forming a seal and preventing fluid passage. This method of controlling fluid flow by the relative movement between the valve ball and the valve seat features simple structure, convenient operation, and good sealing performance.

Application Fields of Coaxial Valves:

The wide application of coaxial valves benefits from their excellent performance and diverse adaptability. They can be used to control various media, including gaseous, liquid, gel-like, particulate, high-pollution, and corrosive substances. They are widely used in numerous fields, including machine tool cooling and lubrication, petroleum extraction and processing, gas production equipment, powder metallurgy, high-pressure cleaning machines, pressure grouting, blow molding machines, sewage treatment equipment, foaming equipment, high-pressure testing equipment, laminar cooling, and vacuum equipment. Coaxial valves demonstrate unique advantages, especially in situations requiring high pressure, high flow rate, rapid response, and corrosion resistance.

Advantages of Coaxial Valves:
High Pressure Resistance: The balanced structural design of coaxial valves minimizes the impact of fluid pressure on the valve driving force. Switching only needs to overcome friction, allowing them to withstand higher fluid pressures.
Anti-Clogging: Its structure is particularly suitable for controlling particulate, viscous, and easily solidifying media, effectively preventing clogging.
Long Lifespan: In complex and harsh application environments, the service life of coaxial valves can reach more than 10 million times, far exceeding that of conventional valves.
Rapid Response: The pressure balance design minimizes the effect of the media pressure on the valve stem force. Coupled with the short valve stem stroke, this provides rapid and repeatable operation capability.
Maintenance-Free: Coaxial valves only have one moving part (the piston rod) and lack the packing seal components and additional drive actuators found in traditional valves, reducing maintenance costs and workload.

In summary, coaxial valves, with their unique structural design and excellent performance characteristics, play an important role in industrial production. With continuous technological advancements and the expansion of application fields, coaxial valves are sure to leverage their unique advantages in even more areas, bringing greater convenience and efficiency to industrial production.