| 摘要 |
An electromagnetic valve (10) comprising a housing (12) having a fluid containing region (14) and first and second ports (18, 20) in communication with the region (14), an electromagnet (130) carri ed by the housing (12) located external to the fluid containing region (14), of the housing (12), and a barrier in the form of a thin diaphragm (160) of fluid impermeable material which hermetically isolates the electromagnet (130) from the fluid containin g region (14). An armature (200) is movably posi- tioned in the region (14) and has a pole portion (204) located for magnetic attraction by the electromagnet (130) and has a plung- er portion (202) provided with a valve formation (250) for opening and closi ng one of the ports (18, 20) to place both ports (18, 20) in fluid communication through the fluid containing region (14) of the housing (12) in one control state of the valve (10) and to block fluid communication between the ports (18, 20) in another control state of the valve (10). The armature (200) is moved from a rest position through a forward stroke when attracted by the electromagnet (130) to change the control state of the valve (10), and the armature (200) is moved by a biasing spring (244) in an opposi te direction through a return stroke back to a rest po- sition.
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