| 摘要 |
<p>A valve (10) is disclosed comprising a valve housing (14) including a valve seat (12), a valve head (16) movably housed within the valve housing (14) for seating with the valve seat (12), and a lip seal (30) connected to either the valve head (16) or the valve seat (12). The lip seal (30) is configured to be hydraulically biased into contact with the valve seat (12) or the valve head (16) to maintain closure of the valve.</p> |
