Check valve for piping systems, its main role is to prevent media backflow, to prevent the pump and its drive motor reversal, as well as the container media release. Check valves can also be used on lines where the pressure may rise to a level above the pressure of the main system auxiliary system. Check valve according to the different materials, can be applied to a variety of media on the pipeline. Check valve installed in the pipeline, that is, become the fluid components of the complete pipeline, its valve opening and closing process will be affected by the transient state of the system in which it is affected; in turn, the valve closing characteristics and Occurrence of fluid flow on the state of action. Check valve is characterized by large load changes, opening and closing frequency is small, put into a closed or open state, the application cycle is very long, and does not require movement of moving parts. But once the "switch" requirement, you must be flexible, this requirement is more demanding than the more mechanical movement. As the check valve in most practical use, qualitatively determined for quick closure, and in the moment the check valve is closed, the medium is the direction of flow, with the valve flap closed, the medium quickly fell from the maximum velocity of back to zero , While the pressure is rapidly increased, that is, there may be a damaging effect on the piping system "water hammer" phenomenon. For multiple high-pressure pipeline parallel pump system, check valve water hammer problem is more prominent. Water hammer is a kind of pressure wave in the transient flow in the pressure pipeline, which is the hydraulic impact phenomenon that the pressure rises or falls due to the change of the fluid velocity in the pressure pipeline. The physical reason for its production is the result of the incompressibility of the fluid, the inertial of the fluid and the elasticity of the pipeline. In order to prevent water hammer hidden in the pipeline, over the years, people in the design of the check valve, using a number of new structures, new materials, to ensure the applicable performance of the check valve at the same time, the impact of water hammer to a minimum Has made encouraging progress.
DB Dustin Injection Moulding Machine
DB dustin injection moulding machine
DB dustin injection moulding machine
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