Hydraulic Terms I, Hydraulic phrases I, Hydraulic glossary I

Hydraulic Terms I speak to hydraulic phrases C and hydraulic glossary C which are words and phrases in common use in the hydraulic industry.

Inertia Inertia is the reluctance of a body to change in its motion and is directly related to the quantity of matter in a body. The more mass or matter an object has the heavier it is and the harder ir is to move.

Intensifier An intensifier multiplies an existing hydraulic pressure by accepting hydraulic pressure at the large area piston and applying the resultant force to the small area piston. Pressure is then amplified.

Internal Gear Motor The internal gear motor consists of one external gear which meshes with the teeth on the inside circumference of a larger gear.

Invert Emulsion A common water oil emulsion of a modern hydraulic system is a creamy white liquid made up of 60% oil and 40% water. As compared to a previous emulsion 60% water and 40% oil, the ratio of this emulsion is inverted. Since oil is the dominant liquid and carrier of water droplets, invert emulsions have increased lubricating characteristics with a slight decrease in fire resistance.

Invert Emulsion Bacteria Formation Under the proper temperature conditions an invert emulsion can support the growth of bacteria. Bacteria in large quantities can plug pressure sensing orifices of pressure control valaves and pressure compensated flow controls. Bacteria can also plug filter elements. Many invert emulsions are equipped with a bacteria additive to avoid this situation.

Invert Emulsion Bacteria Test This is performed by sight and smell. If bacteria is present in an invert emulsion, inlet filters will appear to be coated by mucous or slime and the bacteria will emit an offensive odour. The oil will have to be changed.

Invert Emulsion Phase Separation These emulsions are not meant to be operated at low temperatures as ice slivers will form below 32 F. Repeated freezing and thawing of an invert emulsion could cause water and oil phases to separate to a large degree. In this condition it would be very difficult to get the two liquids back together again thus fire resistance would be a serious problem.

Invert Emulsion Phase Separation Test A check for phase separation is done by inspection. With the fluid in a reservoir mixed, It is difficult to determine whether oil and water phases have separated. Draining off a fluid sample into a jar and allowing the fluid to rest for a period of time, it is noted that any free water settles to the bottom of the jar.


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