What is the working pressure, rated pressure, maximum allowable pressure of hydraulic pump

work pressure; Hydraulic pumps.

The outlet pressure at the time of actual operation is called the working pressure. It is the pressure established by the hydraulic pump to overcome the load resistance. The magnitude of the working pressure depends on the size of the external load and the pressure loss on the drain line, and is not related to the flow rate of the hydraulic pump.

Rated pressure: The maximum pressure that the hydraulic pump can work continuously under normal working conditions according to the test standard is called the rated pressure of the hydraulic pump. It reflects the capacity of the pump, the general nameplate.

The pressure on the calibration is the rated pressure.

Maximum allowable pressure: Under the condition of exceeding the rated pressure, the maximum pressure value that allows the hydraulic pump to run for a short time according to the test standard is called the maximum allowable pressure of the hydraulic pump. Above this pressure, the leakage of the pump can increase rapidly.

The connection between the three is as follows:

The working pressure of the hydraulic pump refers to the pressure of the hydraulic pump to output the oil when it is actually working, that is, the pressure established by the oil to overcome the resistance. The working pressure of the hydraulic pump is related to the external load, and if the external load increases, the working pressure of the hydraulic pump also increases. The maximum working pressure of the hydraulic pump refers to the increase of the working pressure of the hydraulic pump with the increase of external load, when the working pressure increases to the strength allowable value of the parts of the hydraulic pump itself and the maximum allowable leakage, the working pressure of the hydraulic pump will no longer increase, and the working pressure of the hydraulic pump is the highest working pressure.

The rated pressure of the hydraulic pump refers to the maximum working pressure that the hydraulic pump is allowed to reach during operation, that is, the pressure marked on the nameplate of the hydraulic pump or the product sample. Considering that the hydraulic pump should have a certain pressure reserve in the work, and have a certain service life and volumetric efficiency, usually its working pressure should be lower than the rated pressure. in the hydraulic system.

The working pressure of the fixed displacement pump is determined by the relief valve.

adjust and stabilize; The working pressure of the variable pump can be adjusted by means of a regulating device on the pump itself. It should be emphasized that the output pressure of the hydraulic pump is generally not the rated pressure, but the working pressure.

working pressure; The outlet pressure when the hydraulic pump is actually working is called the working pressure. It is the pressure established by the hydraulic pump to overcome the load resistance. The amount of working pressure depends on the size of the external load and the pressure loss on the drain line, and has nothing to do with the flow rate of the hydraulic pump.

Rated pressure. Under normal working conditions, the maximum pressure that can work continuously according to the test standard is called the rated pressure of the hydraulic pump. It reflects the pump's capacity and is generally rated on the nameplate.

maximum permissible pressure; Under the condition of exceeding the rated pressure, according to the test standard, the maximum pressure value that allows the hydraulic pump to run for a short time is called the maximum allowable pressure of the hydraulic pump, and beyond this pressure, the leakage of the pump will increase rapidly.

In fact, many people know this, but how much do they really know?

HydraulicsThe work pressure mainly depends on:Load

Generally speaking, the working pressure of the hydraulic system refers to the highest working pressure of the system, if the pressure is higher than the value of the equipment, the relief valve.

Work to relieve pressure. The actual working pressure of the hydraulic system is determined by the load, which refers to the hydraulic oil.

The actual pressure can generally be determined by a pressure gauge.

Direct reading. This pressure increases as the load increases.

It can be known by the balance of forces: cylinders.

The thrust of the cylinder = the load, the thrust of the cylinder = the working pressure of the hydraulic oil * the working cylinder area, that is, the working pressure = the load of the cylinder area. The choice of pressure depends on the size of the load and the type of equipment.

Hydraulic system structure

The hydraulic system consists of two parts: signal control and hydraulic power, and the signal control part is used to drive the control valve action in the hydraulic power part.

The hydraulic power part is represented in a circuit diagram to show the interrelationship between the different functional elements. The hydraulic source contains a hydraulic pump, an electric motor and hydraulic auxiliary components; The hydraulic control part contains various control valves for controlling the flow, pressure and direction of the working oil; The actuator contains a hydraulic cylinder or a hydraulic motor.

It can be selected according to the actual requirements.

When analyzing and designing real-world tasks, block diagrams are typically used to show the actual health status of the equipment. The hollow arrows represent the signal flow, while the solid arrows represent the energy flow.

Sequence of action in the basic hydraulic circuit – reversing and spring return of control elements (two-position four-way directional valves), extension and retraction of actuators (double-acting hydraulic cylinders) and opening and closing of relief valves. For actuators and control elements, the presentation is based on the corresponding loop diagram symbols, which also prepares the way for the introduction of loop diagram symbols.

When the working pressure of the hydraulic pump is greater than the rated pressure, it cannot be used, because this will lead to damage to the hydraulic pump and all hidden dangers. Here's why:

First of all, the rated pressure of the hydraulic pump refers to the maximum working pressure when designed, and the use of guessing the wheel beyond the rated pressure will make the internal components and sealing elements of the pump withstand overload work, which will lead to serious consequences such as mechanical damage, leakage and even **.

Secondly, the rated pressure of the hydraulic pump is obtained after strict calculation, test and detection, and the use of the rated pressure beyond the range will not only cause damage to the hydraulic pump itself, but also cause potential safety hazards to users and equipment.

Finally, for the hydraulic system, the working pressure should not exceed the rated pressure at the time of system design, otherwise it will adversely affect the system, including reducing work efficiency, accelerating system wear and tear, etc.

Therefore, in order to ensure the normal operation and safety of the hydraulic pump and hydraulic system, we must comply with the rated pressure of the hydraulic pump and do not use it beyond the rated pressure range.

The hydraulic pump is bright and simple.

It can be used when the working pressure is greater than the rated pressure, for example, the working pressure of the pump is 35, but the working time cannot exceed 5 minutes. Otherwise, it will have a great impact on the sealing of the pump itself and the life of the pump.

The pressure should not be too much, otherwise it will be unsafe.

When the hydraulic pump leaves the factory, the pump will do a pressure test, as long as it does not exceed 10% of the rated pressure of the pump, it should not be a big problem. Considering economic and technical issues, it is best not to exceed the rated pressure of the pump 2 3.

Common hydraulic pumps can be divided into variable pumps and quantitative pumps according to whether the flow rate is adjustable. The output flow can be adjusted according to the needs of the variable pump, and the flow can not be adjusted is called the fixed pump.

It is okay to use the hydraulic pump in excess of the rated pressure when the hydraulic pump is short, but it will cause irreversible slapping effects on the pump if it is used for too long a time, and the overpressure use of the pump will only cause a lot of pressure on the flow channel and rotor components, resulting in the deviation of the working condition point of the pump.

What is the relationship between "working pressure", "maximum pressure" and "rated pressure" of a hydraulic pump?

Hello dear. The relationship between "working pressure", "maximum pressure" and "rated pressure" of hydraulic pumps is as follows. The working pressure of the hydraulic pump refers to the fluid pressure output when the hydraulic pump is working normally.

Because the output pressure of the hydraulic pump is determined by the load, the working pressure will change with different working conditions; The maximum pressure of the hydraulic pump refers to the maximum pressure of the fluid that the hydraulic pump can output. Under the maximum pressure condition, the efficiency of the hydraulic pump will become low, the leakage will increase, and the high pressure will also have a great impact on the life of the sealing material. Therefore, the maximum pressure can be reached occasionally for a short period of time, but cannot be operated continuously at this pressure.

The rated pressure of the hydraulic pump refers to the maximum output pressure that the hydraulic pump can achieve under normal operation. In the design of the hydraulic system, from the efficiency, life and stability of the system, it is necessary to ensure that the system pressure will not exceed the rated pressure of the hydraulic pump by means of overflow, unloading, variable adjustment, etc. To sum up, it can be seen that the rated pressure is the working pressure.

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a. Working pressure: The output pressure of the hydraulic pump when it is actually working is called the working pressure. The working pressure depends on the size of the external load back to the hydraulic system and the pressure loss on the drain line, and has nothing to do with the flow rate of the hydraulic pump.

b. Rated pressure: the maximum pressure of continuous operation of the hydraulic pump under normal working conditions according to the test standard, usually, the working pressure shall not exceed the rated pressure. Generally, the pressure rating will be marked on the nameplate.

c. Maximum allowable pressure: under the condition of exceeding the rated pressure, the maximum pressure value allowed for the short operation of the hydraulic pump according to the test standards. Above this pressure, the leakage of the pump can increase rapidly.

The rated pressure must not exceed the maximum allowable pressure, once exceeded, the pump will leak.

Working pressure: The pressure of the system when working, which varies with the size of the load.

Maximum Pressure: The pressure that is allowed to exceed the rated pressure for a short time or instantaneous.

Pressure rating: The maximum pressure at which the pump is allowed to operate for a long period of time, usually the design pressure of the pump.

The maximum pressure is greater than the rated pressure.

The rated pressure is greater than or equal to the working pressure.

The pressure at the time of normal work is the pressure of work.

The rated pressure is the pressure that the pump itself is capable of achieving in continuous normal operation.

The maximum pressure is the maximum pressure that the pump can reach, and this pressure is the working capacity of the pump, but the pressure cannot work continuously, and it can be used occasionally.