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Valve, especially for fluid handling bodies with microflowchannels

  • US 5,593,130 A
  • Filed: 03/06/1996
  • Issued: 01/14/1997
  • Est. Priority Date: 09/06/1993
  • Status: Expired due to Term
First Claim
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1. A valve comprising a valve body with two fluid flow channels separated by a land portion which forms a valve seat having a sealing surface for co-operation with a flexible membrane mounted over a duct which opens in front of the valve seat and is arranged for fluid pressure actuation of the membrane between a closed position, where the membrane sealingly contacts the valve seat, and an open position where there is a flow channel communicating space between the valve seat and the membrane, wherein said sealing surface of the valve seat comprises(i) a primary sealing surface located nearest and facing the membrane, and(ii) a secondary sealing surface provided on each fluid channel side of the valve seat, so that when the valve is closing, the membrane successively seals against the primary sealing surface and the secondary sealing surfaces, and, inversely, when the valve is opening, the membrane is successively separated from the secondary sealing surfaces and the primary sealing surface.

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