Poppet-type solenoid valve

A poppet-type solenoid valve comprising:

• a housing including an input port, an output port, and a discharge port;
• a valve chamber which is formed in said housing, with which said input port and said discharge port respectively communicate through a supply valve seat and a discharge valve seat facing each other, and with which said output port communicates in a position between both said valve seats;
• a poppet valve body disposed in said valve chamber to open and close said supply valve seat and said discharge valve seat;
• and a solenoid portion including a movable core for causing said poppet valve body to carry out opening and closing operations,
• wherein said supply valve seat is formed on a valve seat body which is disposed for moving forward and rearward in such directions as to approach and move away from said discharge valve seat and which defines said valve chamber,
• said valve seat body includes a supply flow path connecting said input port and said supply valve seat, first and second pressure receiving faces which have different pressure receiving areas and on which fluid pressure from said input port acts in opposite directions, and a third pressure receiving face on which fluid pressure in said valve chamber acts in the same direction as on said second pressure receiving face, said valve seat body moves forward in such a direction as to approach said discharge valve seat due to a fluid pressure operating force based on an area difference between said first and second pressure receiving faces when said supply valve seat is closed with said poppet valve body and moves rearward in such a direction as to move away from said discharge valve seat due to a fluid pressure operating force based on an area difference between said respective pressure receiving faces when said poppet valve body opens said supply valve seat.