Digital two, three, and four way solenoid control valves

  • US 5,640,987 A
  • Filed: 04/05/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 04/05/1994
  • Status: Expired due to Term
First Claim
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1. A control valve, comprising:

  • a housing with a first port and a second port, said housing further having a valve chamber;

    a spool that can move between a first position and a second position within said valve chamber, said spool preventing fluid communication between said first port and said second port when in said first position and allowing fluid communication between said first port and said second port when said spool is in said second position, said spool having a pair of tapered surfaces located at opposite ends of said spool; and

    ,solenoid means for moving said spool between said first and second positions, wherein a residual magnetism of said spool and said housing maintain the position of said spool.

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