초록 ▼

A valve which includes a stem having a slit at an end thereof. The valve stem is located in a valve body and is deformable. When a tip of an instrument is engaged with a slit in the stem, the stem shifts in the valve body, top portion folds inward, the slit seals against the instrument and allows li

A valve which includes a stem having a slit at an end thereof. The valve stem is located in a valve body and is deformable. When a tip of an instrument is engaged with a slit in the stem, the stem shifts in the valve body, top portion folds inward, the slit seals against the instrument and allows liquid to flow through the stem, to or from the instrument. All components have circular cross sectional geometry.

대표청구항 ▼

A valve which includes a stem having a slit at an end thereof. The valve stem is located in a valve body and is deformable. When a tip of an instrument is engaged with a slit in the stem, the stem shifts in the valve body, top portion folds inward, the slit seals against the instrument and allows li

A valve which includes a stem having a slit at an end thereof. The valve stem is located in a valve body and is deformable. When a tip of an instrument is engaged with a slit in the stem, the stem shifts in the valve body, top portion folds inward, the slit seals against the instrument and allows liquid to flow through the stem, to or from the instrument. All components have circular cross sectional geometry. e surfaces, a plurality of internal flow passages that terminate in the hot face, at least one stress-relief slit in the hot face, positioned between adjacent internal flow passages, and at least one stress-relief slit in each side surface, wherein the stress-relief slit in each side surface is positioned, relative to the hot face, approximately 30% to 50% of a length of the burner nozzle. 10. The burner nozzle according to claim 9, wherein said stress-relief slits in the hot face has a depth that ranges from about 25% to 75% of a depth of the hot face. 11. The burner nozzle according to claim 9, wherein the burner further comprises an internal plenum fluidly connected to the internal flow passages. 12. The burner nozzle according to claim 9, wherein said stress-relief slit in the hot face is positioned midway between adjacent internal flow passages. 13. The burner nozzle according to claim 9, wherein the internal flow passages each have a longitudinal axis, and at least a portion of the axes of two adjacent internal flow passages form an angle relative to each other. 14. The burner nozzle according to claim 9, wherein said stress-relief slit in the hot face substantially bisects said angle. 15. The burner nozzle according to claim 9, wherein said stress-relief slits terminate in a generally cylindrical portion. 16. The burner nozzle according to claim 9, wherein said stress-relief slits are oriented in different directions. 17. A method for reducing thermally generated stresses in a refractory burner nozzle, the method comprising: providing a burner nozzle having a hot face, side surfaces, and a plurality of internal flow passages; forming a number of stress-relieving mechanisms in said hot face, wherein when the internal flow passages each have a longitudinal axis, and at least part of the axes of two adjacent internal flow passages form an angle relative to each other, said stress-relieving mechanisms in the hot face have depth of about 10% to 75% of a length of a radius bisecting said angle. 18. The method according to claim 17, wherein said stress-relieving mechanism in the hot face is positioned between adjacent internal flow passages that terminate in the hot face. 19. The method according to claim 17, wherein said stress-relieving mechanism in the hot face is positioned midway between said adjacent internal flow passages. 20. The method according to claim 17, wherein said burner nozzle further includes an internal plenum fluidly connected to said internal flow passages. 21. The method according to claim 17, wherein the stress-relieving mechanisms in the hot face have a depth of about 50% to 75% of a perpendicular distance from said hot face to a leading edge of said plenum. 22. The method according to claim 17, further comprising forming a number of stress-relieving mechanisms in said side surfaces. 23. The method according to claim 17, wherein said stress-relieving mechanisms in the side surfaces are positioned, relative to the hot face, at about 30% to 50% of a length of said burner nozzle. 24. The method according to claim 17, wherein said side surfaces have a predetermined thickness, and said stress-relieving mechanisms in the side surfaces have a depth of about 20% to 50% of the thickness. 25. The method according to claim 17, wherein said stress-relieving mechanisms in the hot face are a number of slits. 26. The method according to claim 17, wherein said stress-relieving mechanisms terminate in a generally cylindrical portion. 27. A method for extending the useful life of a refractory burner nozzle, the method comprising: providing a burner nozzle having a hot face, a first and second side surfaces, and a plurality of internal flow passages; forming a number of stress-relieving mechanisms in said hot face, wherein said stress-mechanisms in the hot face has a depth that ranges from about 25% to 75% of a depth of the hot face. 28. The method according to claim 27, wherein said stress-relieving mechanism in the hot