| 摘要 |
There is disclosed a valve cap for sealing an aperture in a pump; a plugging assembly for use in a valve cap to provide a seal at an aperture in a pump; a docking unit for use with a plugging assembly for sealing an aperture in a pump; and a method of sealing an aperture in a pump. In an embodiment of the invention, a valve cap ( 10 ) for sealing an aperture ( 12 ) in a pump is disclosed which comprises a valve plug ( 16 ) for locating against a wall ( 18 ) of the aperture, the plug including, a first engaging means ( 40 ); a compression unit ( 20 ) fastened to the pump, the compression unit including a plurality of springs ( 56 ) to apply a compressive load upon the plug and second engaging means ( 62, 64 ); a docking unit ( 24 ) for landing on the compression unit, the docking unit including one or more pistons ( 92 ) to apply a compressive load upon said springs and third engaging means ( 74, 76, 78 ); wherein said first and third engaging means sequentially interlock with said second engaging means to lock said plug to said compression unit and seal said plug against said aperture.
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