Currently, there is no accepted guide rotary jet pump (except impeller) hydraulic design of the basic theory, this limits the jet grouting pump application, promotion.
At present, there is no recognized basic theory of hydraulic design of rotary pump (except impeller), which limits the application and popularization of rotary spray pump.
At present, there is no generally accepted basic theory of hydraulic design of pilot jet pump (except impeller), which limits the application and popularization of the pump.