| 摘要 |
<p>The present invention relates to a connecting tube of a valve body through which fluids (chemicals, toxic gases, and liquids) flows. The connecting tube is sealed to prevent a sealing member attached to the connecting tube from being exposed to the fluid, thereby improving air tightness. According to an embodiment of the present invention, the valve connecting device having a double seal structure comprises: a valve body which has an inlet to pour in the fluid and an outlet to pour out the fluid; a ball valve wherein a through-hole is formed to connect the inlet with the outlet; a valve seat which supports the ball valve to be able to rotate; a stem which rotates the ball valve; an operation lever which rotates the stem in order to open and close the inlet and outlet; upper and lower packings which prevents the fluid from leaking through the valve seat or the fluid inside the valve body when opening and closing the ball valve; an airtight gasket, combined with a receiving groove formed on the outside surface of the upper and lower packings, which seals a gap between the upper and lower packings; a metal seal which comprises a first sealing unit formed on an edge of the mouth of the receiving groove of the upper and lower packings, and a second sealing unit formed on the valve body in order to reseal the gap between the valve body and the upper and lower packings adhering to the first sealing unit when fastening the upper and lower packings to the valve body in order to press the airtight gasket by the pressing guide.</p> |
