Abstract: Disclosed are methods and apparatuses for removing and/or installing valves located between two fixed pipe spool pieces. The valves can be located between first and second immovable pipe spool pieces having a fixed distance between the first and second immovable pipe spool pieces, and in the process of removal a gap is created between the first and second immovable pipe spool pieces. The immovable pipe spool pieces can have longitudinal axes which are parallel, and the gap created along a longitudinal line which is parallel to the two longitudinal axes of the pipe spool pieces. The longitudinal axes of the first and second pipe spool pieces can be coincident with each other.

Abstract: Disclosed are methods and apparatuses for removing and/or installing valves located between two fixed pipe spool pieces. The valves can be located between first and second immovable pipe spool pieces having a fixed distance between the first and second immovable pipe spool pieces, and in the process of removal a gap is created between the first and second immovable pipe spool pieces. The immovable pipe spool pieces can have longitudinal axes which are parallel, and the gap created along a longitudinal line which is parallel to the two longitudinal axes of the pipe spool pieces. The longitudinal axes of the first and second pipe spool pieces can be coincident with each other.

Abstract: A union assembly useful in a fluid flowstream includes a body portion, a pressure indicating device and a removable cover. The body portion includes a bore, an access opening and pressure indicating device cavity in fluid communication, and a first plurality of threads disposed around the access opening. The removable cover includes a passageway and a second plurality of threads disposed around the passageway. Engagement of the first and second pluralities of threads will secure the removable cover to the body portion for use of the union assembly without any additional mechanism connecting the removable cover with the body portion. When the union assembly is assembled, a cut-out portion on the removable cover is disposed at least partially around the pressure indicating device, whereby the pressure indicating device must be disengaged from the body portion before the removable cover may be disconnected.

Abstract: A valve includes a valve body having an upstream bore, a downstream bore, a fluid flow chamber and a valve seat useful for sealing the fluid flow chamber from the downstream bore. The valve also includes a valve stem, a bonnet connected to the valve body and adapted to receive the valve stem therethrough, and a plurality of sealing assemblies operably connected to the valve stem.