SARHBased on the traditional sewage exhaust valve, a lower buffer mechanism is added at the bottom of the buffer type sewage compound inlet and exhaust valve, which is widely used for the inlet and exhaust of drainage pipeline. It is especially suitable for the conditions of large fluctuation of pipeline trend and frequent start-up and shutdown of the system, which are easy to produce cut-off closure and water column separation. The valve is used to remove a large amount of accumulated air in the pipeline, and at the same time, the micro air accumulated in the higher part of the pipeline is discharged into the atmosphere, so as to improve the use efficiency of the pipeline and water pump. When the pump is shut down, a large amount of air is inhaled to prevent the pipeline from vacuum damage. Sarh exhaust valve can maintain high exhaust speed, meanwhile, it has the function of waterproof hammer and preventing sewage from spraying out at the moment when the exhaust valve is closed. Considering the characteristics of the sewage, the floating ball directly acts on the light spherical piston structure through the top plug, so that the closing water level is lowered, and the impurities floating objects are far away from the sealing surface. A ball valve is set at the bottom of the valve body to wash the impurities in the valve body.

SARHSelection of exhaust valve diameter: when the flow rate of water in the pipeline is between 1.2 and 2.4m/s, the diameter of buffer type sewage composite inlet and exhaust valve can be selected according to the following table (or 1 / 8 of the pipe diameter according to experience). If specific exhaust parameter curve is required, please consult the technical center of our company.