Hydraulics Glossary: G

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A glossary of the key terms you may encounter when working with hydraulic systems. Introducing the letter 'G'…

GAS-LOADED ACCUMULATOR:
A hydraulic component used to store hydraulic fluid. The gas-loaded accumulator increases and relieves pressure through the use of an inflatable bag. Also called an air-operated accumulator.
GATE VALVE:
A two-way hydraulic valve that may be opened or closed to either allow or prohibit the flow of hydraulic fluid. The gate valve consists of a plate-like obstruction that is raised and lowered into place to control the flow of hydraulic fluid. Often designed so that when open, the opening of the passage is not restricted, but there will be some small pressure loss.
GAUGE:
An instrument or device for measuring, indicating, or comparing a physical characteristic, such as pressure or volume.
GUAGE PRESSURE:
A term used to state that any pressure stated is corrected for atmospheric pressure. Normally abbreviated “psig” – (pounds per square inch gauge).
GEAR:
A circular toothed component that engages, rotates, and transmits power to another circular toothed component when rotated.
A hydraulic pump that uses meshed gears that rotate and move liquid through a hydraulic system.
A hydraulic pump that creates pressure in a hydraulic system through the interaction of two toothed gears that are located adjacent to one another. One gear rotates and drives the other gear.
A hydraulic pump that creates pressure in a hydraulic system through the interaction of two toothed gears that are located one inside of the other. A gear with external teeth rotates and drives the internal gear.
A gear-within-gear pump that consists of an inner gear with one less tooth than the outer gear.
A mechanical device that is used to contain a seal, o-ring or gasket in a specified space to result in a leak-proof connection between two or more mechanical components.
A two-way valve that may be opened or closed to adjust the flow of hydraulic fluid, between and including, fully on and fully off. The globe valve consists of a circular plug and a tapered seat. Usually manually operated so that the flow of fluid must make a non-straight turn inside the valve body which results in a loss of pressure across the valve when open, which is bigger than the loss across a gate valve.
A reference point of zero in electrical circuits to which all circuit voltages are compared. Also, “grounding” a device means to make connections to an earth ground for safety purposes.

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