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Positive-displacement pump with inlet float chamber

  • US 5,527,164 A
  • Filed: 12/23/1994
  • Issued: 06/18/1996
  • Est. Priority Date: 06/07/1990
  • Status: Expired due to Term
First Claim
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1. A positive-displacement pump comprisingmeans defining a pump chamber (20) of variable volume for receiving fluid being pumped,a pumping mechanism (18,19) including (i) a displacement member (18) which is movable through an ejection stroke to contract the pump chamber and a filling stroke to expand the pump chamber, and (ii) a driving device (19) for repetitively driving the displacement member through the ejection stroke,an inlet (12,14) opening into the pump chamber,an inlet valve (16A,17) which is disposed in the inlet and adapted to open and close to allow and prevent, respectively, fluid flow from the inlet into the pump chamber, andan outlet (15,17) communicating with the pump chamber, characterised in thatthe inlet valve (16A,17) includes a valve seat (17A) defining an inlet opening in the inlet (15,17), and a hollow valve member (16A,21) which defines a cavity and has a sealing portion (21A) engageable with the valve seat and which is displaceable towards and away from the valve seat (17A) between an open position with the sealing portion spaced from the valve seat and a closed position with the sealing portion in engagement with the valve seat,the cavity of the valve member (16A,21) forms part of the pump chamber (20) and communicates with the inlet opening through a valve member opening surrounded by the sealing portion (21A), anda valve member actuating means (A) is associated with the pump chamber (20) for translating the pressure of fluid received in the pump chamber from the inlet (12/14) into a force which is applied to the valve member (16A,21) to displace it relative to the valve seat (17A).

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