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An electromagnetic valve includes: a housing, a ball valve, a ball guide to hold the ball valve, a shaft that displaces the ball valve; an electromagnetic solenoid part that drives the shaft; a seat component; and a seal member. The seat component has a cylindrical portion disposed inside of the hou

An electromagnetic valve includes: a housing, a ball valve, a ball guide to hold the ball valve, a shaft that displaces the ball valve; an electromagnetic solenoid part that drives the shaft; a seat component; and a seal member. The seat component has a cylindrical portion disposed inside of the housing, and has a predetermined depth in an axial direction. An inflow valve port passes through a first end of the cylindrical portion in the axial direction. The seal member is coupled with an outer circumference part of the housing at a position corresponding to the cylindrical portion.

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1. An electromagnetic valve comprising: a housing having an outflow valve port for oil corresponding to operation fluid, the outflow valve port opposing an inflow valve port in an axial direction,an outlet port defined on a lateral side of the housing, anda valve chamber located between the inflow v

1. An electromagnetic valve comprising: a housing having an outflow valve port for oil corresponding to operation fluid, the outflow valve port opposing an inflow valve port in an axial direction,an outlet port defined on a lateral side of the housing, anda valve chamber located between the inflow valve port and the outflow valve port, and communicated with the inflow valve port, the outflow valve port, and the outlet port;a ball valve disposed in the valve chamber to selectively open or close the inflow valve port or the outflow valve port;a ball guide disposed in the valve chamber to hold the ball valve coaxially with the inflow valve port and the outflow valve port, the ball guide having a communication port communicated with the inflow valve port and the outflow valve port;a shaft that displaces the ball valve;an electromagnetism solenoid part that drives the shaft;a seat component having a cylindrical portion disposed inside of the housing and having a predetermined depth in the axial direction, the inflow valve port located adjacent to a first axial end of the cylindrical portion, the inflow valve port is defined in a bottom of the seat component having a diameter less than an inner diameter of the cylindrical portion; anda seal member having an annular shape and coupled with an outer circumference part of the housing at a position corresponding to an outer side of the cylindrical portion of the seat component, whereinthe ball valve seats on the bottom of the seat component so as to close the inflow valve port,the cylindrical portion has a constant inner diameter between the first axial end adjacent to the inflow valve port and a second axial end adjacent to a flange part, andthe diameter of the inflow valve port is less than the constant inner diameter of the cylindrical portion. 2. The electromagnetic valve according to claim 1, wherein the seal member is fitted to the outer circumference part of the housing at the position corresponding to the outer side of the cylindrical portion where an outer diameter of the cylindrical portion is smaller than that of the flange part. 3. The electromagnetic valve according to claim 1, wherein the cylindrical portion of the seat component is fitted to the housing. 4. The electromagnetic valve according to claim 1, wherein the flange part of the seat component is fitted into the housing. 5. The electromagnetic valve according to claim 1, wherein the diameter of the inflow valve port is less than an inner diameter of a part of the cylindrical portion immediately adjacent to the first axial end. 6. The electromagnetic valve according to claim 1, wherein the inflow valve port is further defined by a penetration hole formed in a center portion of the bottom of the seat component. 7. The electromagnetic valve according to claim 6, wherein the flange part, the cylindrical portion and the penetration hole are formed coaxially with each other. 8. The electromagnetic valve according to claim 6, wherein the cylindrical portion, the penetration hole, the inflow valve port and the outflow valve port share an axis thereby allowing the electromagnetic valve to be properly centered. 9. The electromagnetic valve according to claim 1, wherein an outer diameter of the cylindrical portion is less than an outer diameter of the flange part. 10. The electromagnetic valve according to claim 1, wherein the seal member is disposed in a groove formed in the outer circumference part of the housing. 11. The electromagnetic valve according to claim 10, wherein the seal member further includes an O ring seated in the groove. 12. The electromagnetic valve according to claim 1, wherein a part of a protrusion part of the housing plastically deforms the flange part outward in a radial direction. 13. The electromagnetic valve according to claim 1, wherein the shaft is disposed downstream of the valve chamber; andthe ball valve seats selectively between the bottom of the seat component and a wall part of the housing around the outflow valve port. 14. The electromagnetic valve according to claim 1, wherein the seat component has a cup shape and the ball valve is housed in the valve chamber that is defined outside of the seat component. 15. The electromagnetic valve according to claim 14, wherein the cup shaped seat component includes the cylindrical portion and the bottom, and has a constant thickness therebetween.