Abstract: A gate valve actuator that utilizes a mounting ring interposed between the valve bonnet and actuator housing to allow the mounting of different sizes and types of gate valve actuators onto a given gate valve and providing rotation with respect thereto is disclosed. A split retainer ring allows the coupling between the actuator and valve bonnet to avoid the use of bolts subject to corrosion and failure. A first embodiment uses a pneumatically operated diaphragm to provide a force for opening the valve. Other embodiments use pneumatically and hydraulically powered pistons. Another embodiment shows the use of multiple springs to augment the closing force.

Abstract: A safety connection for connecting a plug into a tubular member, the tubular member having an internal sealing surface, an internal recess positioned outward from said internal sealing surface, said recess ending in inwardly extending lip with a plurality of slots therethrough and external threads; a plug having a body with a plurality of radially extending pins positioned to pass through said slots in said lip, a radially extending flange and a pin extending radially outward from the plug at a position immediately axially inward of said flange and being out of axial alignment with said pins and sized to fit within one of said slots to position said plurality of pins out of alignments with said slots; and a securing ring having an inwardly extend flange for surrounding the exterior of said plug on the exterior side of said plug flange and internal threads for engaging the external threads on said tubular member to secure said plug in said tubular.

Abstract: A safety connection for connecting a plug into a tubular member such as in a passage of a choke or valve body, the tubular member having a threaded port extending into the interior of the passage, a plug body positioned within said passage and having an external groove being aligned with the opening of the port into the interior of the passage, a threaded plug positioned within said port, and having an inner end engaging within the external groove in the plug body, sealing means between said plug body and the interior of said passage, means for sealing between the interior of said threaded plug and the threaded port, a vent opening extending through said threaded port and being sealed by the seating of said threaded plug in said threaded port, the partial unthreading of said threaded plug outwardly in said threaded port opening the vent opening for venting pressure from within the tubular member while maintaining the inner end of the threaded plug in engagement with the groove in the plug body to retain it in

Abstract: A valve having a body with a valve chamber therein, an inlet into the valve chamber, an outlet from the valve chamber and an opening to the valve chamber aligned with the outlet, a bonnet secured to the body covering the opening, and having a tubular projection, a valve seat insert having a valve seat positioned in said outlet, a valve member, means for moving the valve member toward and away from the valve seat to control flow from the valve, means for releasably securing the valve seat insert to the bonnet tubular projection.