| 摘要 |
A jack assembly comprises a cylinder defining an interior, a piston having a piston head slideably engaged with the interior of the cylinder, an extension chamber defined between the piston head and the interior, and a pressure relief assembly integrated proximate the piston head and defining a relief passageway in selective fluid communication with the extension chamber. When a fluid pressure in the extension chamber exceeds a certain level, the pressure relief assembly allows fluid to flow through the relief passageway. In one form, the pressure relief assembly comprises a valve body, a relief passageway defined within the valve body, a valve seat formed along the relief passageway, a plug configured to selectively engage the valve seat, an adjustment member moveable along the relief passageway, and a biasing member captured between the plug and the adjustment member to urge the plug toward the valve seat.
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