Patent ID: 6273396
Filing Date: 2001-08-14
Classification: F16K

Abstract:
An electromagnetic valve for opening and closing a fluid communication path comprising:a valve body capable to open and close the fluid communication path;a first biasing member for biasing the valve body in a valve opening direction;a second biasing member for biasing the valve body in a valve closing direction, a biasing force of the first biasing member to the valve body being balanced with a biasing force of the second biasing member to the valve body in the absence of a force opposing said biasing forces so that the valve body may stay at a predetermined intermediate position to open the communication path; andan electromagnetic device having a fixed member for generating an electromagnetic attracting force when energized and a moving member movable according to the electromagnetic attracting force, the moving member being driven, when the fixed member is energized, so as to have the valve body move against the biasing force of the first biasing member during a first moving stroke extending from the predetermined position to a position where the valve body closes the fluid communication path so that an elastic energy may be stored in the first biasing member during the first moving stroke,wherein the valve body is moved back together with the moving member, when the fixed member is de-energized, by the first biasing member not only during the first moving stroke but also during a second moving stroke extending from the predetermined position to a position where the second biasing member stores an elastic energy practically responsive to the elastic energy stored in the first biasing member during the first moving stroke and, further,wherein there is enough space where the valve body and the moving member may move during the first and second moving stroke so as not to hit the fixed member.