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Tests of electrohydraulic switching valves with fluidic ball elements

  • US 4,919,497 A
  • Filed: 08/03/1988
  • Issued: 04/24/1990
  • Est. Priority Date: 08/04/1987
  • Status: Expired due to Fees
First Claim
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1. A magnetic valve with self regulation of a flow medium for use in anti-skid brake systems (ABS), having large flow cross section for normal braking and a reduced flow cross section in ABS operation, comprising a valve housing (10), a control coil (11) in said valve housing, a tubular armature (13) displaceably supported within said control coil, a valve body (17) in said housing, a stationary valve seat on said valve body (17), a sealing element holder (15) in said valve housing which is carried by said armature, a sealing element (16) on said sealing element holder which is moved by the armature relative to said stationary valve seat, a valve opening spring which applies a valve opening force on said sealing element holder to slowly enlarge an opening cap between said valve body (17) and the sealing element (16), said armature having a bottom portion (27) that communicates with an inflow region of said valve housing, said inflow region encompassing said sealing element (16) associated with said sealing element holder (15), the sealing element (16) and the stationary valve seat being formed and disposed such that within a predetermined stroke and flow ranges, an aspiration effect due to the flowing medium ensues due to fluid flow from an inlet in said valve body via said valve seat through said gap to an outlet (22), and a retaining means adapted to act upon the armature (13) counter to suction forces created by said aspiration effect, which after termination of an electrical excitation of said control coil of the magnetic valve, forces emanating from strong aspiration effects are overcome due to increasing flow rates and said retaining means is able to move said armature and said sealing element (16) a full stroke away from said stationary valve seat when strong aspiration effects disappear below a pre-set limit.

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