Patents Assigned to Holthuis B.V
  • Sludge pump valve
    Patent number: 5193577
    Abstract: A sludge pump valve for use in pumping systems which pump aggressive, abrasive, and corrosive liquids containing granular material, pumped over long distances and at high pressures, employs a pair of elastic sealing elements provided, respectively, with spherically configured convex and concave surfaces that mate along a spherical contact surface during valve closing to effect leak-free seal of the valve, the arrangement being such that valve is made more maintainence free and has a longer service life.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: March 16, 1993
    Assignee: Holthuis B.V
    Inventor: Cornelis J. de Koning