Poppet-type solenoid valve

摘要

A poppet valve body for opening and closing a supply valve seat and a discharge valve seat by operation of a movable core is provided in a valve chamber having the supply valve seat and the discharge valve seat. The supply valve seat is formed at a valve seat body movable in such directions as to approach and move away from the discharge valve seat. The valve seat body is formed with first and second pressure receiving faces which have different pressure receiving areas and on which fluid pressure from an input port acts in opposite directions and a third pressure receiving face on which fluid pressure in the valve chamber acts. The valve seat body, the poppet valve body, and the movable core move forward in such a direction as to approach the discharge valve seat due to a fluid pressure operating force based on an area difference between the first and second pressure receiving faces when the supply valve seat is closed with the poppet valve body. The valve seat body moves rearward in such a direction as to move away from the poppet valve body due to a fluid pressure operating force based on an area difference between the respective pressure receiving faces when the poppet valve body opens the supply valve seat.