| 摘要 |
<p>Title of the Invention : Ball Valve Assembly of the Invention : The invention relates to a ball valve assembly including a ball valve member made of a plastic resin material, preferably polyvinyl chloride, and movable mounted in a valve cavity formed in a valve body again made of a plastic resin material, preferably polyvinyl chloride. In the assembly, the valve body consists of two body elements coupled in a male-and-female connection with each other and rigidly and permanently united together thereat. Thus, the ball valve is confined in the valve cavity in an unseparable way, and yet kept nearly in a floating condition within the valve cavity by direct and resilient contact with a pair of seat rings made of an elastomer or elastic rubber. These seat rings are so shaped and arranged when seen in an axial section of the valve assembly that they represent four limited contacting areas with the ball valve exerting sealing and floating pressures against the ball valve directing all substantially towards the center of the latter.</p> |
