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Discharge pressure is the force of liquid exiting a pump, influenced by other aspects of the pump. Flow rate describes how much material can flow through the pump, while capacity measures how much liquid the pump can hold. Head pressure is determined by the force of the motor and the nozzle design. Discharge pressure is commonly described in terms of vertical feet.
Discharge pressure describes the pressure of a liquid as it exits a pump. Higher discharge pressures equal more force behind the release while lower pressure means less. The discharge pressure of a pump is influenced, but not determined, by other aspects of the pump. While this term is independent of other descriptions for a pump, the overall combination of flow rate, inlet pressure, and capacity will determine the total horsepower of the system.
The head pressure of a pump is actually the last step in the system. Most pumps start with suction or suction pressure. This describes how much liquid the pump can draw in at any given time. Since most pumps are designed for circumstances with a lot of material to move, this part of the system is often not a factor. The only common place where it becomes useful is when the pump needs to pull material against gravity or some other basic force.
The next major part of a pump system is the flow rate. This factor describes how much material can flow through the pump at any given time. The flow rate is directly influenced by how much material enters, suction, and how much material leaves, discharge. Flow rate can describe the amount of material that will move over longer periods, where other factors are usually more immediate.
Capacity is a measure of how much liquid the pump can hold at a time. In some pumps, this is simply the amount from the system inlet to the outlet. Other types of pumps essentially store material within the system to create additional pressure and improve discharge.
The final step in a pumped system is the relief pressure. This pressure is affected by the amount of material in the system; if the system is low on material, the pressure will likely be lower, but most of the value is independent. The head pressure of a pump is usually determined by two main factors: the force of the pump and the design of the nozzle. The force of the motor inside the pump determines the force: more powerful motors create higher pressures. The shape of the nozzle is the final factor; Narrow, narrow nozzles create more pressure than wide or open nozzles.
It is common to describe discharge pressure in terms of vertical feet. This means that if the pump were operating at optimum conditions, the output would be directed up a specified number of feet; the higher the discharge pressure, the higher the number. The also makes it easy to determine pressure at other angles; for example, it is increased by 50 percent when facing to the side and 100 percent when facing down.
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