Small solenoid valve

A small solenoid valve comprising:

• a valve casing provided inside with a first valve chamber and a second valve chamber;
• a stem which is coupled to a solenoid plunger of a solenoid, and is inserted into a shaft hole provided in said valve casing;
• a valve body attached to a distal end of said stem;
• a circular ring-shaped first valve seat which is provided inside said first valve chamber of said valve casing, and on which said valve body is seated;
• a circular ring-shaped second valve seat which is provided between said first valve chamber and said second valve chamber of said valve casing, and on which said valve body is seated;
• a seal ring made of a rubber-like elastic body located between said second valve chamber and said solenoid plunger, and externally fitted to said stem with an outer peripheral portion thereof made to contact with an inner surface of said shaft hole;
• a first port connected to communicate with said first valve chamber;
• a second port connected to communicate with an inner side of said first valve seat;
• and
• a third port connected to communicate with said second valve chamber, wherein
• at actuation of said solenoid, when said stem moves in an axial direction, said seal ring follows the movement by only elastic deformation without sliding, and when said valve body is seated on said first valve seat, said first valve chamber and said second valve chamber communicate with each other to disconnect said first port and said second port from each other and communicate said first port and said third port with each other, and when said valve body is seated on said second valve seat, said first port and said third port are disconnected from each other and said first port and said second port communicate with each other.