Solenoid valve

A solenoid valve comprising:

• a casing defining therein inlet and outlet passages and a valve seat, the valve seat establishing a fluid communication between the inlet and outlet passages when opened and blocking the fluid communication when closed;
• a diaphragm type valve member installed in the case, the valve member being movable between an open position wherein the valve member is separated from the valve seat thereby to open the same and a close position wherein the valve member is seated on the valve seat thereby to close same, the valve member having hereon a magnetic material;
• a biasing coil that biases the valve member in a direction to cause the valve member to assume the close position;
• and
• an electromagnetic actuator installed in the casing, the actuator comprising a core rod, an electromagnetic coil coaxially mounted on the core rod through a coil bobbin and a yoke member including two arm members by which the core rod is held,
• wherein the arm members have inwardly extending lower portions whose leading ends face each other with a given clearance left therebetween, and wherein the lower portions face an upper surface of the valve member thereby to serve as a work part of the electromagnetic actuator, the work part producing a magnetic force applied to the magnetic material of the valve member when the actuator is energized.

A solenoid valve comprising:

• a casing defining therein inlet and outlet passages and a valve seat, the valve seat establishing a fluid communication between the inlet and outlet passages when opened and blocking the fluid communication when closed;
• a diaphragm type valve member installed in the case, the valve member being movable between an open position wherein the valve member is separated from the valve seat thereby to open the same and a close position wherein the valve member is seated on the valve seat thereby to close same, the valve member having hereon a magnetic material;
• a biasing coil that biases the valve member in a direction to cause the valve member to assume the close position;
• and
• an electromagnetic actuator installed in the casing, the actuator comprising a core rod, an electromagnetic coil coaxially mounted on the core rod through a coil bobbin and a yoke member including two arm members by which the core rod is held,
• wherein the arm members have upper portions connected through a bridge member and inwardly extending lower portions whose leading ends face each other with a given clearance left therebetween, wherein the core rod has an upper end secured to the bridge member and a lower end positioned between the leading ends of the inwardly extending lower portions of the arm members with a given clearance left therebetween, and wherein the inwardly extending lower portions of the arm members and the lower end of the core rod face the upper surface of the valve member thereby to serve as a work part of the electromagnetic actuator, the work part producing a magnetic force applied to the magnetic material of the valve member when the actuator is energized.