| 摘要 |
Ball valve for fluids, with sealing seatings comprising rings, disposed between the spherical surface of the valve and the interior of the valve body, composed of rings formed of superimposed layers of plates of pure graphite alternating with plates of stainless steel sheet, the whole being contained in a casing of metal sheet covering the outer sides of the seating, except that in contact with the spherical sealing surface.</SDO AB>
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