The invention relates to a direct-acting type ratio overflow valve which comprises a ratio
electromagnet, a spring base, a spring, a valve core, a valve base, a valve body and an adjusting screw, wherein a push rod of the ratio
electromagnet is directly connected with the valve core or is connected with the valve core through a transition rod, the spring base is directly arranged on the end surface of the ratio
electromagnet, and the spring is arranged on the spring base and the valve core; and
spring force and
force output by the ratio electromagnet are acted on the valve core in a superposition manner, when the input is zero, the ratio overflow valve can have high opening pressure, the adjusting screw is adjusted to change the
spring force, a characteristic curve of the ratio overflow valve moves in an upper-down manner, and a dead zone of the ratio overflow valve can not be increased. According to the valve, the requirements that the direct-acting type ratio overflow valve has the high opening pressure when an input
signal is zero, and when the input
signal is increased, the opening pressure is increased in a ratio manner, and the dead zone is small can be met, and the cost is low.