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The inner wall of the stainless steel welding layer is inclined tapered, the outer wall of the multi-layer sealing ring is inclined cone, and the outer wall of the multi-layer sealing ring is consistent with the inner wall of the stainless steel welding layer. The upper shaft hole of the valve body is stepped inside, and is enlarged by the inward outward diameter. There is packing between the body of the stepped position and the stem, and a packing gland is arranged on the outer end of the upper axle hole.