the hydraulic control taboo

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Hydraulic drive system, usually using two hydraulic control:

(1) Do not ignore the pressure value itself is the size of the control system, the

general public using the relief valve, relief valvestainless steel hydraulic hose fittings

Adjust the pressure must be greater than the sum of the maximum working pressure and

pressure loss. Make the loop pressure is lower than the system

The maximum pressure, you can use the pressure relief valve.

(2) When the pressure reaches a certain value, do not ignore that other parts of the

control such as when the primary circuit pressurestainless hydraulic fittingsnpt fittings

Reaches the pre-adjustment value, you can use the unloading valve or sequential

valve to open and close the secondary circuit.

3. System for unloading

Dosing pumps, hydraulic system, when the non-work cycle or in the hydraulic system

accumulator accumulator fills the oilnpt fittings

Hydraulic pump unloading. Otherwise, not only caused the loss of the success rate,

and high-pressure oil to flow into the fuel tank through the relief valve will lead

to

Heat the oil, causing a series of adverse consequences. Not only that, a long period

of full load, but also accelerate the wear of the hydraulic pump

And reduce its life.

Usually unloading method:

(1) stop the operation of the hydraulic pump in addition to a small number of the

work is generally not used such a method of unloading, it is best

When unloading, the hydraulic pump is still in running condition.

(2) unloading valve such unloading, such as no special requirements to the remote

relief valve unloading more

Appropriate, because the addition of a small control valve, rather t han add to the

other major control components.

(3) median unloading (ie M-type spool) valve such unloading method is very simple,

no additional other hydraulic

Is suitable for small flow hydraulic system.

Taboo: accumulator hydraulic system can not be used.

4. Branch pipe of the power allocation problem

Different actuator with a hydraulic power source and transmission of two or more

systems, such as hydraulic cylinders of the same diameter, but suffered

Load are not equal, then the speed of each hydraulic cylinder is not the same, its

value determines the ratio between the load. In this case,

Throttle Speed ​​device, usually placed in the pipe branch system and the hydraulic

pump pressure is greater than the maximum pressure in each branch to ensure that

Power distribution within a certain range.

Can also use other methods of power distribution system of piping branch. For

example, sometimes the actuator movement to keep raising

Synchronization (with equal speed, or to maintain a certain speed ratio relations

campaign), then will be asked to take the appropriate measures.