| 摘要 |
A fluid control device includes a reciprocating valve comprising a ferromagnetic armature capable of receiving an axis of magnetic polarity corresponding to its axis of reciprocation, the axis generally also corresponding to the longitudinal center of a chamber within said housing, said chamber having a greater radius than the radius of the valve which moves within the chamber. The valve also exhibits a flow-responsive rear radial end face located within a region of communication between said inlet and outlet passages. The valve further has a front end face capable of closing the fluid outlet passage of the device. Further provided is a bias and calibration means located in the housing and disposed co-linearly and distal-proximately to the valve, near the rear radial end face thereof, opposite to the flow-responsive rear radial end of the valve. The bias and calibration means possesses an axis of magnetic polarity substantially co-linear with the magnetic axis of the valve wherein the magnetic properties or polarities of the valve and of the bias means are in the nature of an attractive mode there between. The flow control device also includes a means for changing the axial distal-proximate position of the bias means relative to the valve to thereby calibrate the degree of attraction between the bias means and the valve and, also, to define the geometry of that part of the region of inlet-outlet communication that passes between the flow-responsive rear radial end face of the valve and the bias means.
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