Poppet-type solenoid valve

摘要

A poppet valve body (30) for opening and closing a supply valve seat (15) and a discharge valve seat (16) by operation of a movable core (43) is provided in a valve chamber (11) having the supply valve seat and the discharge valve seat. The supply valve seat (15) is formed in a valve seat body (12) which is movable towards and away from the discharge valve seat (16). The valve seat body is formed with first (17) and second pressure (18) 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 (19) on which fluid pressure in the valve chamber acts. The valve seat body (12), the poppet valve body (30), and the movable core (43) move forwardly in a direction towards the discharge valve seat (16) under a fluid pressure operating force due to a difference in area between the first (17) and second pressure (18) receiving faces when the supply valve seat (15) is closed with the poppet valve body (30). The valve seat body (12) moves rearwardly in a direction away from the poppet valve body (30) under a fluid pressure operating force due to a difference in area between the respective pressure receiving faces when the poppet valve body (30) opens the supply valve seat (15).