Patent ID: 8074959

Claim:
A load line apparatus comprising: a housing having an interior bore, the interior bore defining a flow-through passage; a valve having a valve stem and a surface shaped to close the flow-through passage when the valve is closed; a pair of cam levers pivotally attached to the housing on opposed sides of the housing; and a locking device movable by rotation of at least one cam lever of the cam levers, the locking device comprising an extendable plunger that moves linearly in response to rotation of the at least one cam lever; the at least one cam lever being operable between a locked position in which the locking device forms a stop to prevent the valve being opened by rotation of the at least one cam lever causing the extendable plunger to move linearly and engage the valve stem, and an unlocked position in which the locking device is retracted from the locked position and from the valve stem, the cam lever being operable from the unlocked position into the locked position only when the valve is closed.