After nearly 30 years of introduction and innovation, Axial control valve technology has made great progress, but there is still a big gap compared with the international level. Mainly in the high temperature, high pressure, large diameter field, China's valves generally have problems such as stuck, vibration, high noise, excessive driving torque, low reliability, short life, and leaking seal packing. At the same time, theoretical research and structural innovation can not keep up with the needs of modern industrial development.
The Axial control valve is a new structural valve that is different from the Cv3000 series of regulating valves. It abandons the restraint of the ball valve body structure and the "S" type flow passage. The advantage of the sleeve regulating valve is absorbed, so that the sleeve and the valve core are placed in the flow passage of the valve body cavity, and the flow direction of the fluid does not change substantially during the passage of the regulating valve, and flows axially in the direction of the pipe. This can reduce the flow resistance of the flow path and increase the flow capacity of the valve.
Axial control valve overall structure introduction:
Unlike the traditional regulating valve circulation method, the Axial control valve changes the overall circulation structure of the conventional regulating valve, so that the medium flows axially along the annular flow path in the valve. The flow direction of the fluid in the valve body is small and the energy loss is small. The overall casting drum structure is more suitable for the stress requirements of the pressure vessel, and the pressure bearing performance is good.
The flow capacity of the traditional regulating valve cannot be further increased according to the constraint of the "S"-shaped flow passage structure of the spherical valve body structure. The reason is that the medium changes direction in the flow passage many times, and the medium easily forms a vortex in the flow passage and collides with each other. , Consume energy. Moreover, when the diameter of the Cv3000 series regulating valve is larger than DN400, the stroke of the valve is too long, the sensitivity is lowered, the overall structure is heavy, and the driving force is too large.
The Axial control valve avoids the above disadvantages, allowing the valve body flow passage to flow axially to the axial design, and a streamline conical shroud is provided in the valve body cavity. The flow velocity and the flow of the fluid are diverted to make the fluid distribution of the pipeline uniform, the pressure is balanced, and the flow of the medium in the control process of the valve does not substantially change.
The throttle component refers to the structure of the sleeve valve, the difference is that the axial flow valve installs the sleeve toward the pipeline, and the spool is axially moved in the sleeve, and the spool can be designed as a pressure balanced structure. The imbalance force caused by the pressure difference before and after the throttle is offset, thereby improving the constraint that the conventional valve diameter cannot be made large and the pressure difference is not large.
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