Method for greasing the mated threads of a threaded connector and related device

摘要

A method for greasing the mated threads of a valve stem and a stem nut of a motor-operated valve without the need to actuate the valve and without the need for an internal grease path within the stem nut includes pressurizing one end of the thread interface defined by the mating threads with pressurized grease. A device for carrying out the method may include a thread lubricator that has a bore that receives the free end of the valve stem and an adapter nut that attaches the thread lubricator to the valve housing. Pressurized grease flows into the thread lubricator and to the one end of the tread interface.

主权项

1. A method for greasing the mated threads of a threaded valve stem and a threaded stem nut threaded on the valve stem, the mated threads defining a thread interface between the mated threads of the valve stem and the stem nut extending along the valve stem between a first end and a second end of the thread interface, the method comprising the steps of:
enclosing one end of the thread interface with a pressure vessel, the pressure vessel defining an interior volume in fluid communication with the thread interface; flowing pressurized grease into the interior volume of the pressure vessel and thereby pressurizing the one end of the thread interface with pressurized grease, wherein the pressurized grease in the pressure vessel comes into fluid communication with the thread interface and flows into the one end of the thread interface between the mated threads and towards the other end of the thread interface.