Principle and design methods of a new two-stage flow control valve were presented.Tank pressure was used to regulate the motion of the valve to open the valve and change the work status.The pressurization feeding system started and changed the mass flow rate of the oxide as the valve worked.The key parameters of the valve

including key part's outer diameter

the stiffness and initial compression of the spring

were analyzed.The tests show that the coefficients of local pressure loss of the valve were same at different working statuses.Experimental results for the feeding system using the valve were obtained.In the tests

the valve opened quickly and the feeding system changed the mass flow successfully.In the first stage

the mass flow rate of the hydrogen peroxide was 4.5kg/s.In the second stage

it was 2kg/s.It is proved that the design and test methods of the valve are feasible.