Valve for fluids containing abrasive particles
OwnerJurjen Van der Walinventor
Life of this patent
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Abstract
A high pressure, high temperature, seatless cut-off valve particularly suitable for use with solid materials. The construction employs a sleeve valve reciprocable past aligned ports between concentric tubular housing members under conditions wherein the pressure conditions acting on the valve are fully neutralized at all times. Pressure neutralizing is achieved by passageway means interconnecting chambers embracing the end portions of the sleeve valve and encircling the valve in the area of its flow port and between sets of sealing rings to either axial side of this port. All surfaces contacted by the flowing fluid are preferably lined with protective laminate such as thick ceramic having a protective skin of tough abrasion resistant alloy.
Claims19
A seatless cut-off valve for controlling flow of fluent material at temperatures of the order of 1,000.degree.F to 17,000.degree.F. and pressures of the order of 1,000 psi, said cut-off valve having a main body formed by long inner and outer concentric tubes forming an annular chamber therebetween movably housing an open-ended sleeve valve, said sleeve valve having a flow port through its sidewall, said sleeve valve and flow port being movable into and out of registry with aligned flow ports in said first and second tubes, inlet passage means in communication with said aligned flow ports and outlet passage means opening into one end of said inner tube, closure means for said inner tube on the end thereof remote from said outlet passage means, closure means for the opposite ends of said annular chamber between said inner and outer tubes, means connected to said sleeve valve for shifting said sleeve valve between the open and closed positions of said flow ports, fluid seal means to either axial side of said flow ports and between said sleeve valve and the juxtaposed surfaces of said inner and outer tubes which seal means are so positioned and arranged as never to move in contact with a surface of said cut-off valve which is ever in the path of fluent material flowing between said inlet and outlet passage means.
A pressure-balanced seatless cut-off valve comprising a main body having inner and outer concentric tubes, closure means crosswise of one set of adjacent ends of said tubes and crosswise of said inner tube in an area remote from said one set of ends, outlet passage means from the other end of said inner tube and including means closing the adjacent end of said annular chamber, a sleeve valve open at both ends movably supported in said annular chamber, the midlength portions of said tubes and of said sleeve valve having flow ports which are in or out of alignment depending on the adjusted position of said sleeve valve in said annular chamber, said main body having inlet passage means opposite the flow ports in said inner and outer tubes, fluid seal means permanently disposed to either axial side of said flow ports providing fluid seals between the juxtaposed surfaces of said sleeve valve and said inner and outer tubes, fluid passage means interconnecting the opposite ends of said annular chamber and cooperating with said fluid seals to neutralize the pressure differential between the opposite ends of said annular chamber and along the interior and exterior surfaces of said sleeve valve.
Dependencies are inferred from the claim text.