To carry out high pressure control by a small valve which is fast in responsibility.
It becomes possible to carry out high pressure control by s small proportional solenoid 10 as force of the proportional solenoid 10 results in being amplified as a plunger 5 is pressurized to the left and a poppet 7 is pressurized on a sheet surface 6a through a spring 8 when it is made S1>S2 by applying primary side pressure from a hydraulic pressure source 2 to a pressure surface (area S1) of the poppet 7 and a pressure surface 5a (area S2) of the plunger 5 through an introduction passage 1e. When S2 is made 1/2 of S1, control pressure becomes twice, and when its is made 3/4, the control pressure becomes four times, and when the proportional solenoid 10 becomes small, responsibility also becomes fast, and a control valve can be also supplied at low cost.
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