Check valves should be sized accordingly and the valve provider must provide data on the selected size so that the valve size details can be found when the valve is fully open at a given flow rate.
Diaphragm check valve
Diaphragm-type check valve is practical for easy to breed water strike on the pipeline, the barrier can well eliminate the water strike that occurs when the medium countercurrent is bred, it is usually used on the low-pressure normal temperature pipeline, especially practical for the water pipe, the same as the usual medium temperature between -12- 120℃, the pressure <1. 6MPa, but the diaphragm check valve can achieve a larger diameter, the maximum DN can reach more than 2000mm;
Spherical check valve
The spherical check valve is suitable for medium and low pressure pipeline and can be made into large diameter; The shell material of the spherical check valve can be made of stainless steel, and the hollow sphere of the seal can be wrapped in polytetrafluoroethylene engineering plastic, so that it can also be applied in the pipeline of the same usually corrupting medium, and the temperature is between -101 and 150 ° C, and its nominal pressure is less than 4. 0MPa, the nominal channel range between 200-1200;
In addition, when selecting a check valve for non-compressible fluids, the first step is to evaluate the necessary closing rate, and the second step is to select a check valve example that is roughly satisfied with the necessary closing rate. The check valve selection for compressible fluids can be based on the same principles as the check valve for non-compressible fluids. If the range of media activity is large, the check valve for compressible fluids can be used as a decelerating device. If the media flow is quickly stopped and started in succession, such as the outlet of the compressor, the lift and drop check valve is used.
Check valves should be sized accordingly, and the valve provider must provide data on the selected size so that the size of the valve when it is fully opened at a given flow rate can be found.
