Lets go back again and see if we can figure this out.......
Quote:
Originally Posted by 907dave
I have a hard time following this.......without volume there cannot be any pressure, pressure is basically a measurement of restriction (to the flow/ volume).
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With that garden hose blocked off there is pressure in it, but only because there is a pump trying to push volume behind it. The greater the restriction to the flow, or the larger the volume trying to overcome that same restriction.......the higher the pressure.
Quote:
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The purpose of a hydraulic pump is to supply a flow of fluid to a hydraulic system. The pump does not create system pressure, since pressure can be created only by a resistance to the flow. As the pump provides flow, it transmits a force to the fluid. As the fluid flow encounters resistance, this force is changed into a pressure. Resistance to flow is the result of a restriction or obstruction in the path of the flow. This restriction is normally the work accomplished by the hydraulic system, but can also be restrictions of lines, fittings, and valves within the system. Thus, the pressure is controlled by the load imposed on the system or the action of a pressure-regulating device
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Taken from
Chapter 4 Pumps
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