| 摘要 |
<p>An apparatus is provided which prevents the removal of a companion fitting when the valve is open. Thus, for example there is disclosed a load line apparatus comprising a housing, a valve, a cam lever, or more likely a pair of cam levers, and a locking devic e. The housing has an interior bore, the interior bore defining a flow-through passage. The val ve has a surface shaped to close the flow-through passage when the valve is closed. The cam lever is pivotally attached to the housing, and the locking device is movable by the cam lever. The cam lever is operable between a locked position and an unlocked position. In the locked position, the locking device forms a stop to prevent the valve being opened. In the unlock ed position, the locking device is retracted from the locked position. The cam lever is operable from the unlocked position into the locked position only when the valve is closed. Th e load line apparatus disclosed prevents the valve from being opened unless the cam leve r is the unlocked position. The load line valve may also prevent a pipe fitting from being uncoupled with a coupling end of the pipe when the valve is opened.</p> |
