The disclosed technology includes pumps, pipes, valves, seals, and systems for pumping and controlling high temperature fluids, such as liquid tin, at temperatures of between 1000-3000 C. The systems and device may be partially or entirely constructed using brittle materials, such as ceramics, that are capable of withstanding extreme heat without significantly degrading, and may be secured using components made of refractory metals, such as tungsten. The systems and devices may utilize static and dynamic seals made from brittle materials, such as graphite, to enable the high temperature operation of such pumps, pipes, valves, and systems without leakage.

A valve for use in a fluid end. The valve has a solid body with a sealing surface. The valve may move into position where the valve contacts a valve seat. When in contact, the valve and valve seat prevent flow through the valve. The valve and valve seat each have hardened inserts in their respective strike faces. The insert in the valve is less hard than the insert in the valve seat. Both are typically made of a ceramic material, such as tungsten carbide.

A plug for retaining a filter screen in a fluid port of a servovalve, comprises an annular body, the annular body comprising: opposed first and second axial end surfaces, a radially inner surface extending between the first and second axial end surfaces, a radially outer surface extending between the first and second axial end surfaces and at least one recess formed in the radially inner surface for receiving a tool for removing the plug from the port. A tool for removing the plug comprises a pair of handles pivotally mounted to one another about a pivot, each handle having a plug gripping portion extending therefrom beyond the pivot, each plug gripping portion comprising an outwardly projecting tooth for engaging in the recess of the plug when the plug gripping portions are moved apart by operation of the handles.

A self-compensated sealed rotary cone valve core, comprising a valve sleeve, wherein an upper part of the valve sleeve is provided with an axial through hole; a lower chamber of the valve sleeve is provided with a conical surface coaxial with the axial through hole; an inlet cavity is formed in the cone platform; a through hole communicated with a water outlet in a side wall of the lower part of the valve sleeve is formed in a side wall of the inlet cavity; a screw rod part of the core shaft penetrating through the valve sleeve is sequentially sleeved by a limiting piece and a spring gasket and is locked by a screw nut to realize pre-tightening sealing and rotary positioning with the valve sleeve. The valve core is simple in structure and convenient to process and mount, self-sealing and wear self-compensation can be achieved.

A plug for retaining a filter screen in a fluid port of a servovalve, comprises an annular body, the annular body comprising: opposed first and second axial end surfaces, a radially inner surface extending between the first and second axial end surfaces, a radially outer surface extending between the first and second axial end surfaces and at least one recess formed in the radially inner surface for receiving a tool for removing the plug from the port. A tool for removing the plug comprises a pair of handles pivotally mounted to one another about a pivot, each handle having a plug gripping portion extending therefrom beyond the pivot, each plug gripping portion comprising an outwardly projecting tooth for engaging in the recess of the plug when the plug gripping portions are moved apart by operation of the handles.

A valve for a high temperature liquid, more in particular for liquid ZnMg, wherein the valve parts are made of ceramic material and graphite to be heat-resistant against the temperature of these liquid metals.

A self-compensated sealed rotary cone valve core, comprising a valve sleeve, wherein an upper part of the valve sleeve is provided with an axial through hole; a lower chamber of the valve sleeve is provided with a conical surface coaxial with the axial through hole; an inlet cavity is formed in the cone platform; a through hole communicated with a water outlet in a side wall of the lower part of the valve sleeve is formed in a side wall of the inlet cavity; a screw rod part of the core shaft penetrating through the valve sleeve is sequentially sleeved by a limiting piece and a spring gasket and is locked by a screw nut to realize pre-tightening sealing and rotary positioning with the valve sleeve. The valve core is simple in structure and convenient to process and mount, self-sealing and wear self-compensation can be achieved.

The disclosed technology includes pumps, pipes, valves, seals, and systems for pumping and controlling high temperature fluids, such as liquid tin, at temperatures of between 1000-3000 C. The systems and device may be partially or entirely constructed using brittle materials, such as ceramics, that are capable of withstanding extreme heat without significantly degrading, and may be secured using components made of refractory metals, such as tungsten. The systems and devices may utilize static and dynamic seals made from brittle materials, such as graphite, to enable the high temperature operation of such pumps, pipes, valves, and systems without leakage.

A valve for a high temperature liquid, more in particular for liquid ZnMg, wherein the valve parts are made of ceramic material and graphite to be heat-resistant against the temperature of these liquid metals.

A method of refurbishing a damaged valve is disclosed that generally includes receiving a valve housing having generally collinear inlet and outlet ports in the side walls thereof and an interior annular face about each of the inlet and outlet ports, the housing comprising a first metal with a yield strength and the side walls having a predetermined thickness, creating an annular groove about an interior annular face of the inlet port, creating an annular groove about an interior annular face of the outlet port, and placing a second metal within each of the annular grooves, the second metal having a yield strength, wherein the yield strength of the first metal is less than the yield strength of the second metal.