Abstract: Safety valves and control apparatus for generally inaccessible fluid storage facilities wherein a closure mechanism may be attached to an access conduit at an accessible control location and inserted with the conduit into a casing or outer conduit, which closure mechanism may be actuated by control mechanism from the accessible control location to open or close the access conduit or the annulus between the access conduit and the casing, as desired, to permit or interrupt fluid flow, respectively therein. In an underground storage reservoir with access facilities including an outer casing and an inner conduit, separate closure mechanisms may be attached to the inner conduit and inserted therewith along and within the casing to the reservoir, and may be actuated independently to open or close the annulus between the outer casing and inner conduit, and the inner conduit, to thereby control fluid flow in either or both, as desired.

Abstract: Safety valves and control apparatus for generally inaccessible fluid storage facilities wherein a closure mechanism may be attached to an access conduit at an accessible control location and inserted with the conduit into the storage facilities, which closure mechanism may be actuated by control mechanism from the accessible control location to open or close the access conduit at the remote storage facilities to permit or interrupt fluid flow, respectively. In an underground storage reservoir with access facilities including an outer casing and an inner conduit, separate closure mechanisms may be attached to the inner conduit and inserted therewith along and within the casing to the reservoir, and may be actuated independently to open or close the annulus between the outer casing and inner conduit, and the inner conduit, to thereby control fluid flow in either or both, as desired.

Abstract: A self-energizing, positive engagement safety mechanism for long stroke, well pumping units, whether powered mechanically or hydraulically, and which employ a lift belt and counterweight. Upon failure of the sucker rod, polish rod or lift belt, a latching mechanism is actuated to engage a rack on both sides of the counterweight thereby to arrest and lock the counterweight against free fall. Actuation of the latching means is controlled by sensing belt tension below the counterweight thereby to enhance the sensitivity and reliability of the safety mechanism.

Abstract: A yo-yo variety reciprocating drive for long stroke, well pumping units, which employ a flexible element as the operative link between the winding drum and the polish rod of the well pump. Reversal from an upstroke to a downstroke is cushioned by mechanism which provides a power source off dwell period of predetermined duration during the aforesaid stroke exchange and is adjustable to control the length of stroke of the pumping unit. A velocity control senses the velocity of the polish rod during such dwell period and re-energizes the power source when a predetermined velocity is achieved following reversal of direction.