HYDRAULIC CYLINDERS TERMS
F Filter (OIL) - A device which removes solids from a fluid.
Fitting - An adapter designed to connect different types of hose, tubing or pipe together. Fixed Displacement Pump - A pump in which the output per cycle cannot be varied.
Float - This valve connects the “A” and “B” work ports to the tank port in a detented fourth position. This allows oil to flow from both ends of a double-acting cylinder which, in turn, allows the rod to extend or retract depending on the force applied to the rod. For example, a bulldozer blade or a snowplow blade. Flow Control Valve - A valve which controls the rate of flow Flow Divider Valve - A valve which divides the flow from one source into two or more branches. (Includes “priority” and “proportional” types.) Flow Meter - A testing device which gauges either flow rate, total flow, or both. Flow Rate - The volume of fluid passing a point in a given time. Fluid Power - Energy transmitted and controlled through use of a pressurized fluid. Force - A push or pull acting upon a body. In a hydraulic cylinder, it is the product of the pressure on the fluid, multiplied by the effective area of the cylinder piston. It is measured in pounds or tons. Four-Way, Four Position - This valve is identical to four-way, three-position with the fourth position as “float” or “motor” position. Power up, gravity down. Four-Way, Three-Position - Controls double-acting cylinders. Four-way denotes the flow pattern: (1) inlet, (2) “A” work port, (3) “B” work port, and (4) outlet. Three-position denotes the handle position: (1) forward or up, (2) neutral or middle, and (3) back or down. Power up, gravity down. Friction - The resistance to fluid flow in a hydraulic system. (An energy loss in terms of power output.) Full-Flow Pressure - The pressure at which a valve is wide open and passes its full flow.
G
Gauge (Pressure) - A device for measuring the pressure of a gas or liquid. Gear Pump - Uses two gears. The “drive” gear is keyed to the shaft and meshes with the “driven” gear. The oil flows around the outside diameter of each gear as they revolve. A suction is formed on the inlet side by the oil being carried away in the cavities formed beneath the teeth of the gears. The oil is then transported around and discharged into the cavity of the outlet port. The meshing of the teeth in the middle seals the inlet from the outlet. These are fixed displacement pumps. The output flow can be varied by changing drive speed. Gerotor - This type of motor has two elements -- the inner being keyed to the shaft, which rotate and mesh together inside a housing. At top dead center the two elements come into full mesh. At bottom dead center, the two elements are completely out of mesh. The center element has one less tooth than the outer element, which causes cavities to form as each tooth of the inner element moves from one cavity to the next. Geroler - This type of hydraulic motor also has two elements. As the inner gear rotates, rollers which form the displacement chambers provide support by a rolling action which minimizes friction. As with the gerotor type motor, the inner gear has one less tooth than the outer element formed by the rollers. Gland - The end cap through which the rod extends from the cylinder tube. The gland has seals for the rod and for the tube of the cylinder as well. GPM - Gallons per minute - common flow rate term in hydraulics Heat Exchanger - A device which transfers heat through a conducting wall from one fluid to another. Horsepower - The work produced per unit of time. Hydraulics - The engineering science of liquid pressure and flow. Hydraulic Amplifier / Intensifier - A hydraulic intensifier is a hydraulic machine for transforming hydraulic power at low pressure into a reduced volume at higher pressure H
192
Prices subject to change. For the most accurate pricing, please refer to our website at Baileyhydraulics.com or call one of our Customer Experience Representatives at 1-800-800-1810.
Made with FlippingBook flipbook maker