... for all the water supply systems which need water pressure boosting and a constant flow.FEATURES OF PRODUCT1. Have no ... soft starting, overload, short-circuit, over-pressure, under-pressure, lack of phase, overheat and speed loss protections, signal warning, self-detecting ... supply : 380v(+5%,-10%), 460v(+5%,-10%), TWG series intelligent tpye non-negative pressure stable flow water supply equipment