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A solenoid valve (10) has a valve housing (11); one end portion of the valve housing (11) is provided with a flow passage portion (16) having ports and a valve element housing hole to store a poppet valve (41), and the other end portion of the valve housing (11) is opened. Parts, such as a fixed iro

A solenoid valve (10) has a valve housing (11); one end portion of the valve housing (11) is provided with a flow passage portion (16) having ports and a valve element housing hole to store a poppet valve (41), and the other end portion of the valve housing (11) is opened. Parts, such as a fixed iron core (50) having a supporting leg (52) and a driving leg (51), and a movable iron core (60) which drives the poppet valve (41) is inserted from an opening end (17) on the other end portion of the valve housing (11). All parts to be inserted into the valve housing (11) are inserted from one direction.

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1. A solenoid valve comprising: a valve housing in which a poppet valve is assembled, the valve housing having two end portions, one end portion of the valve housing being provided with a flow passage portion having ports, and other end portion of the valve housing being provided with an opening, th

1. A solenoid valve comprising: a valve housing in which a poppet valve is assembled, the valve housing having two end portions, one end portion of the valve housing being provided with a flow passage portion having ports, and other end portion of the valve housing being provided with an opening, the poppet valve being operated between a closed position in which the poppet valve abuts on a valve seat to block communication among ports, and an open position in which the poppet valve separates from the valve seat to enable communication among the ports;a flow passage block which is attached to the flow passage portion so as to partition a valve element housing hole;a bobbin which is provided with a coil and a fixed iron core;a movable iron core which is disposed between the fixed iron core and the flow passage block so as to drive the poppet valve; anda flat spring having a spring force which urges the movable iron core in a direction separating from the fixed iron core,wherein the flow passage block has a bottom surface which abuts on the valve housing, andthe flat spring has a bottom surface which abuts on an upper surface of the flow passage block; and an upper surface which abuts on a bottom surface of the bobbin. 2. The solenoid valve according to claim 1, wherein the valve housing has a first port and a second port; the flow passage portion is provided with a first valve seat having a first communication hole through which the first port and the second port communicate with each other;the valve housing further has a third port; the flow passage block is provided with a second valve seat having a second communication hole through which the third port and the second port communicate with each other; andthe poppet valve abuts on the first valve seat to block communication between the first and second ports while the poppet valve separates from the second valve seat to allow the second and third ports to communicate with each other when the coil is de-energized; and the poppet valve abuts on the second valve seat to block communication between the second port and the third port while the poppet valve separates from the first valve seat to allow the first and second ports to communicate with each other when the coil is energized. 3. The solenoid valve according to claim 1, wherein the bobbin has a fixed flange which is fitted into an inner surface of the valve housing and; a fitting projection which is provided on an end surface of the fixed flange, anda bottom surface of the fitting projection of the bobbin abuts on the flat spring. 4. The solenoid valve according to claim 1, wherein the bobbin has a cylindrical main body through which the fixed iron core is disposed, and an abutting flange is provided on one end of the cylindrical main body so that the abutting flange abuts on an inner surface of the fixed iron core. 5. The solenoid valve according to claim 4, further comprising: a first sealing member which seals a gap between the flow passage block and the valve housing; anda second sealing member which seals a gap between a fixed flange of the bobbin and the valve housing. 6. The solenoid valve according to claim 5, wherein the fixed iron core has a driving leg and a supporting leg;the supporting leg is provided with: a sealing flange on a leading end portion of the supporting leg, and an abutting protrusion on the leading end portion of the supporting leg, closer to the tip of the supporting leg than the sealing flange;the abutting protrusion is surrounded by a sealing surface of the sealing flange;a third sealing member is provided on the sealing surface of the sealing flange;the driving leg is surrounded by a sealing surface of a yoke portion; anda fourth sealing member is provided on the sealing surface of the yoke portion. 7. A method of producing a solenoid valve comprised of a valve housing in which a poppet valve is assembled, the valve housing having two end portions, one end portion of the valve housing being provided with a flow passage portion having ports, and other end portion of the valve housing being provided with an opening, the poppet valve being operated between a closed position in which the poppet valve abuts on a valve seat to block communication among ports, and an open position in which the poppet valve separates from the valve seat to enable communication among the ports; a flow passage block which is attached to the flow passage portion so as to partition a valve element housing hole; a bobbin which is provided with a coil and a fixed iron core; a movable iron core which is disposed between the fixed iron core and the flow passage block so as to drive the poppet valve; and a flat spring having a spring force which urges the movable iron core in a direction separating from the fixed iron core, wherein the flow passage block has a bottom surface which abuts on the valve housing, and the flat spring has: a bottom surface which abuts on an upper surface of the flow passage block; and an upper surface which abuts on a bottom surface of the bobbin, wherein: the method comprises the steps of:installing the poppet valve, the flow passage block, the flat spring, the movable iron core, and the bobbin in the valve housing via the opening of the valve housing; andinjecting a liquid-state resin into the valve housing so that the movable iron core and the bobbin are fixed to the valve housing by the resin. 8. The method according to claim 7, wherein the installing step comprises: attaching the poppet valve to the flow passage block, and installing the flow passage block together with the poppet valve in the valve housing via the opening of the valve housing; andattaching the movable iron core and the flat spring to the bobbin, and installing the bobbin together with the movable iron core and the flat spring in the valve housing via the opening of the valve housing.