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Digital flow tester for internal leakage detection of hydraulic wrench components
source:Industry News release time:2021-11-04 Article author:Rosit Popular:Air band saw
Digital flow tester for internal leakage detection of hydraulic wrench components
Determination of the leakage of hydraulic pump 2A, 2B and lift valve 8
Place all control valves of the hydraulic system in the machine in the neutral position, and fully open the load valve of the tester; start the engine and run it at the rated speed; adjust the load valve of the tester to gradually increase the system pressure. When the system pressure is close to the system overflow pressure of 19.5MPa, the tester reads Q4=191L/min. The hydraulic pump leakage is △Q4=195-191=4L/min.
The leakage of the blade lift valve 8 can be obtained by subtracting the leakage of the hydraulic cylinder and the hydraulic pump from the total leakage of the blade lift circuit, that is, △Q5=24-1-4=19L/min.
It can be seen that the leakage of the blade lift valve 8 is relatively large, and the valve should be disassembled and inspected to eliminate the fault.
If the total leakage of the hydraulic pump △Q4 is large, and you want to know the leakage of each hydraulic pump, you can disconnect the oil circuit at the source of the hydraulic pump and connect it to the flow tester to measure the flow at its outlet. Thus, the leakage of each pump can be calculated.
Requirements
Using a digital hydraulic flow tester, the performance of the entire hydraulic system and its components can be checked. In order to accurately determine the fault location, the test can be carried out in sub-circuits and sections. In the sub-circuit test, especially the segment test, you must pay attention to whether the overflow valve has been connected to the test circuit. If the overflow valve is not connected to the test circuit, the test pressure must be controlled (by using a meter), and it must not exceed the safety pressure designed by the system, otherwise it may cause personal injury and equipment damage.
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