Patent ID: 7770509
Filing Date: 2010-08-10
Classification: F04B,Y10T

Abstract:
1. A valve cap for sealing an aperture in a pump, the cap comprising: a valve plug for locating against a wall of the aperture, the plug including a first engaging means; a compression unit fastened to said pump, the compression unit including a plurality of springs to apply a compressive load upon the plug and second engaging means; a docking unit for landing on the compression unit, the docking unit including one or more pistons to apply a compressive load upon said springs and third engaging means; wherein said third engaging means interlocks by rotation with respect to said second engaging means to lock said docking unit to said compression unit; and wherein said first engaging means sequentially interlocks by rotation with respect to said second engaging means to selectively lock said plug to said compression unit and seal said plug against said aperture.