An actuator assembly for a blowout preventer (BOP) includes a motor, a threaded shaft configured to couple to a ram of the BOP, and a gear system having multiple gear stages. The motor is mechanically engaged with a first gear stage of the plurality of gear stages, the threaded shaft is mechanically engaged with a s...

A bellows assembly is configured to mount between a movable valve structure and a stationary valve structure of a valve assembly. The bellows assembly comprises a bellows and a spacer. The bellows is configured to compress until a gap is closed relative to the spacer. The bellows assembly is configured to bear a loa...

A ball valve positioned between a first line and a second line includes a housing and a ball disposed a ball disposed within the housing. The ball includes a bore and is configured to rotate between an open position and a closed position. The ball valve also includes an annular seat disposed between the housing and ...

ples to the housing. A flapper couples to the shaft. The flapper rotates with the shaft between an open position and a closed position to control movement of a wireline tool through the bore. An actuation system couples to the shaft. The actuation system rotates the shaft. The actuation system includes a lever that ...

Citrate polyester additives for crude oils, mixtures of the citrate polyester additives and crude oils, and methods for producing or forming the mixtures are provided. The mixtures and methods comprise at least one citrate polyester additive introduce or applied to crude oil, wherein the at least one citrate polyest...

A system includes a processor and a memory, accessible by the processor, the memory storing instructions that, when executed by the processor, cause the processor to receive, from a density sensor with an integrated temperature probe, first data indicative of a density of an aqueous liquid flowing through a line, an...