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Title: Valve for fluids containing abrasive particles
Claims: I claim: 1. 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. 2. A cut-off valve as defined in claim 1 characterized in the provision of means interconnecting the opposite ends of said annular chamber supporting said sleeve valve with passage means effective to equalize the pressure acting on the opposite ends and along the portions of said sleeve valve disposed on the remote sides of said fluid seal means. 3. A cut-off valve as defined in claim 1 characterized in that said cutoff valve is so constructed that said sleeve valve is movable between the open and closed positions of said flow ports without making substantially any volumetric change in the interior of said cut-off valve between said inlet and outlet passage means. 4. A cut-off valve as defined in claim 1 characterized in that said outer tube is formed in two sections having means for separably securing the same together between the opposite ends thereof. 5. A cut-off valve as defined in claim 4 characterized in that one end of said inner tube is aligned with and includes seal means forming a fluid tight junction between said one end and said outlet passage means, and removable closure means for the end of said main body remote from said outlet passage means. 6. A cut-off valve as defined in claim 1 characterized in the provision of valve controlled means connected to the opposite ends of said annular chamber housing said sleeve valve for supplying pressurized purging fluid thereto to purge the opposite ends of said annular chamber of dust and foreign matter. 7. A cut-off valve as defined in claim 1 characterized in that said flow ports are inclined to the axis of said sleeve valve. 8. A cut-off valve as defined in claim 1 characterized in that said outer tube is formed in two halves joined by high strength coupling means positioned to one axial side of said aligned flow ports. 9. A cut-off valve as defined in claim 1 characterized in that the flow port in the midlength of said sleeve valve includes at least one rib extending axially transversely of said port with the inner surface thereof flush with the inner surface of said sleeve valve. 10. 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. 11. A cut-off valve as defined in claim 10 characterized in the provision of high temperature heat resistant liner means for said flow ports and the interior surfaces of said sleeve valve and of said inner tube exposed to contact with the fluid flow being controlled by said cut-off valve. 12. A cut-off valve as defined in claim 11 characterized in that said liner means includes ceramic material. 13. A cut-off valve as defined in claim 11 characterized in that said ceramic material is provided with a protective shroud of abrasion resistant high temperature metal. 14. A cut-off valve as defined in claim 13 characterized in that said shroud comprises a Stellite type alloy metal highly resistant to abrasion and corrosion. 15. A cut-off valve as defined in claim 13 characterized in that said liner means extends along at least the surface of said sleeve valve contactable by the fluid flow in the closed position thereof. 16. A cut-off valve as defined in claim 13 characterized in that said flow ports in the sidewalls of said tubes are inclined acutely to the axis of said tubes and toward said outlet passage means in one end of said cut-off valve. 17. A cut-off valve as defined in claim 10 characterized in that said sleeve valve and said inner and outer tubes comprise cast steel. 18. A cut-off valve as defined in claim 10 characterized in that said inner and outer tubes and said sleeve valve having means so constructed and arranged that said sleeve valve can be opened and closed substantially without change in the interior volume of said cut-off valve between inlet and outlet passage means. 19. A cut-off valve as defined in claim 10 characterized in the provision of means extending from one end of said sleeve valve through the adjacent end of said cutoff valve manipulatable to shift said sleeve valve between the open and closed positions thereof. Other info: Inventors: Van der Wal, Jurjen Application Number: 435688 Filing Date: 1974-01-23 Publication_date: 1976-02-10 Assignee: Primary Class(es): 137/375 251/282, 251/325 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Klinksik, Henry T. Assistant Examiner: Attorney: Sellers and Brace |
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