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A solenoid valve has a tapered valve seat disposed between a first flow passage and a second flow passage, a reduced diameter side of the valve seat that is connected with the first flow passage, and a valve body having a closing portion that reduces its diameter toward a tip facing the valve seat.

A solenoid valve has a tapered valve seat disposed between a first flow passage and a second flow passage, a reduced diameter side of the valve seat that is connected with the first flow passage, and a valve body having a closing portion that reduces its diameter toward a tip facing the valve seat. The first flow passage and the second flow passage are connected/disconnected by sliding the valve body for contacting/detaching the closing portion to the valve seat, and a groove is disposed on the closing portion facing the direction of a fluid flow.

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1. A solenoid valve comprises: a tapered valve seat disposed between a first flow passage and a second flow passage;a reduced diameter side of the valve seat that is directly open to the first flow passage;a valve body having a hemispheric closing portion that reduces its diameter toward a tip facin

1. A solenoid valve comprises: a tapered valve seat disposed between a first flow passage and a second flow passage;a reduced diameter side of the valve seat that is directly open to the first flow passage;a valve body having a hemispheric closing portion that reduces its diameter toward a tip facing the valve seat;a spring disposed between the tapered valve seat and the valve body, the spring urging the closing portion of the valve body in a direction away from the valve seat to open the solenoid valve to allow fluid flow from the first flow passage to the second flow passage, the solenoid valve moving the valve body against the valve seat when the solenoid valve is energized, the energizing of the solenoid overcoming the urging of the spring to close the solenoid valve; anda check valve separate from the valve body, the check valve allowing fluid flow from the second flow passage to the first flow passage and prohibiting fluid flow from the first flow passage to the second flow passage; whereinthe first flow passage and the second flow passage are connected and disconnected by sliding the valve body for contacting and separating the closing portion to the valve seat,a groove is formed in the hemispheric closing portion and is formed between the tip of the hemispheric closing portion facing the first flow passage and a contacting part where the closing portion contacts the valve seat when seated onto the valve seat;a direction of fluid flow is from the first flow passage to the second flow passage. 2. The solenoid valve according to claim 1, wherein, the groove is formed on the closing portion throughout a perimeter in a circumferential direction. 3. The solenoid valve according to claim 1, wherein, a plurality of grooves are formed on the closing portion. 4. The solenoid valve according to claim 1, wherein, the closing portion has the groove formed between a conical tip portion and a spherical rear end portion, anda geometric projection of a conical surface extended from the tip portion intersects a spherical surface of the rear end portion. 5. The solenoid valve according to claim 1, wherein the groove is open to the first flow passage when the hemispheric closing portion of the valve body contacts the valve seat. 6. The solenoid valve according to claim 5, wherein the groove defines a planar surface extending in a radial direction of the valve body and a cylindrical surface perpendicular to the planar surface. 7. The solenoid valve according to claim 1, wherein the groove defines a planar surface extending in a radial direction of the valve body and a cylindrical surface perpendicular to the planar surface. 8. The solenoid valve according to claim 1, wherein the check valve is disposed in the valve seat. 9. The solenoid valve according to claim 1, wherein, the groove defines a cylindrical surface extending in an axial direction of the valve body and a planar surface extending from the cylindrical surface of the groove to the hemispheric closing portion; andthe fluid flow from the first flow passage directly impacts the planar surface extending from the cylindrical surface of the groove to the hemispheric closing portion.