Abstract: A pump for sampling fluids from a pipe line has a very high volumetric efficiency. The pump has a plunger that substantially completely displaces the volume of the cavity within which it works. To prevent flow of the fluid from the pipe line to the sampling container when the pipe line pressure is higher than the sampling container, a floating plunger liner has a passage open to the pipe line pressure. The pipe line pressure will force the liner against the outlet valve if the pipe line pressure is higher than the collecting vessel pressure. When the plunger evacuates the cavity the pressure in the cavity will be greater than the pipe line pressure and the outlet pressure and will force the plunger liner downward to open the outlet valve to permit flow of the fluid from the cavity through the outlet to the collecting vessel. If the pressure is lower in the cavity than either the pipe line or the collecting vessel, there will be no flow from the collecting vessel but only flow from the pipe line.

Abstract: Hydraulic fluid is replenished in a pulsator chamber of a fluid driven pulsator pump by having the power plunger in an upstanding bore with spaced seals. The power plunger is withdrawn upon each stroke vertically upward. As it is withdrawn past seals, any gas within the pulsator chamber may be purged or bled into an annular space and there out into a reservoir and scrubbing chamber. Additional hydraulic fluid will flow into the pulsator chamber. Upon the down stroke of the plunger an exact amount of volume will be displaced within the pulsator chamber. Adjustment of the product pumped on each stroke is by sacrificing a measured amount of the pulsator liquid into a sacrifice chamber. The amount of liquid which flows into the sacrifice chamber upon each down stroke and out of the chamber on each upstroke is adjusted by adjusting the movement of a floating piston by a micrometer rod.

Abstract: A gas sampling pump utilizes a body with a cylindrical bore and a cylindrical plunger. A disc valve at the bottom has about the same diameter as the bore, and therefore, when it is seated upon "O" ring which forms a valve seat at the inlet of the bore and when the plunger is seated against the disc, the bore is substantially filled with the plunger and disc valve. The outlet valve is an annular valve. The outlet is connected to a sampling flask. Therefore, if the plunger is reciprocated, that from the top position, there will be a certain volume within the pump which is completely displaced at the bottom of the plunger stroke resulting in an extremely high volumetric efficiency. A balance ring biases the outlet valve to prohibit a free flow of gas when the sampling flask has less pressure than the gas inlet pressure.

Abstract: A large diameter ball is placed within the sample cavity of a liquified petroleum gas sample vessel or cell. After the sample has been taken, the entire cell may be shaken to cause the ball to break up stratification, and to mix the sample. When a vessel or cell is emptied, a ball fits within hemispherical cavities between a piston and an end. The large diameters of the ball and cavities result in shoulders or ledges, which are less than half the diameter of the ball, so that they do not prohibit the movement of the piston because the ball will be forced into the cavities regardless of the orientation of the cell.