The working performance of the check valve has a direct impact on the performance of the whole system. The Plastic Check Valve is affected by the transient change of the pressure field in the H76 check valve, calculate the corresponding performance curve and optimize the structure by reference. To reduce the energy loss of the medium passing through the valve, Optimize the structure of the current diversion structure; Analyze the factors affecting pressure drop, pulse and valve valve vibration during the passage of the medium, Get the best valve opening Angle; Select the torsion springs according to the boundary conditions and working conditions, Reduce the pressure drop and stop the pump water hammer; Analyze the influence of check valve diameter on water hammer, Select the check valve with the appropriate nominal diameter to reduce the damage to the pipe system; Check valve hydrostatic analysis check, Ensure the strength of the check valve statically; Dynamic characteristic mode analysis, Master the dynamic vibration characteristics of the Ball Check Valve, Find the weak link of the valve body vibration; Using buffer cylinder to reduce the check valve, Limit the pipe pressure increase to a safe range, Reduce the positive pressure water hammer, Limit the backflow flow and inversion speed, Reducing the water hammer plays an important role.
Working characteristics: The working characteristics of the check valve are large load change, small opening and closing frequency, a input closing or open state, the application cycle is very long, and does not require the movement of the moving parts. But once there is a "switch" requirement, it must be flexible, which is more demanding than the common mechanical movement.
Because the check valve in most practical use, qualitatively determined for rapid closure, and at the moment of the check valve is closed, the medium is the direction of the flow, with the closure of the valve disc, the medium from the maximum back flow speed quickly fell to zero, and the pressure rises rapidly, that is, the "water hammer" phenomenon may damage the pipe system.
For the high pressure pipe system of multiple pumps, the water hammer problem of the PVC Ball Check Valve is more prominent. Water hammer is a pressure wave in the transient flow in a pressure pipe. It is the phenomenon of the pressure jump or drop due to the change of the fluid flow velocity in the pressure pipe. The physical reason is the incompressibility, the inertia and the elasticity of the pipeline.
Use: The Wafer Check Valve is used in the pipeline system, its main function is to prevent the medium back flow, prevent the pump and its drive motor reversal, and the discharge of the medium in the vessel. The PVC Check Valve can also be used to supply lines in which the pressure may rise to the auxiliary system exceeding the pressure of the main system. Check valve according to the different material, can be applied to a variety of media pipeline. The PVC Swing Check Valve is installed on the pipe, which becomes one of the fluid components and the valve is affected by the transient flow state of the system; in turn, the closing characteristics of the valve valve act on the fluid flow state.