- Often a cartridge type check valve is installed on the inlet line after the pump outlet to reduce the effect of pump pulsation on the subsequent oil line.
- Especially when the need for multiple pumps to achieve a large flow more cartridge type check valve to eliminate the mutual perturbation of the pumps.
- As the test bench conditions are usually intermittent is to follow the test project, in order to avoid frequent start and stop the motor and achieve the purpose of energy saving and part of the safety considerations, often set up electromagnetic loading and unloading function. Can be achieved through a separate electromagnetic relief valve or change in the proportional regulator.
- For testing proportional valves, especially servo valves, experts often recommend installing a high-pressure filter on the inlet line.
Then there’s a question to ponder.
You need to consider the arrangement of the pump, cartridge type check valve, solenoid unloading valve, and high-pressure filter in successive positions carefully. How should you arrange these components more reasonably? What are the advantages and disadvantages of each arrangement?
One of these cartridge type check valves, if not positioned properly, can cause the cartridge to break after unloading or emergency stops. This can result in serious contamination.
Test bench return cartridge type check valve
- For space arrangement and pump suction considerations, the test bench above 500l/min is basically designed as a high-mounted tank. In this way, when the test valve is removed, the test bench will appear in the oil sucking back oil phenomenon. If not properly managed and catch the long holiday is likely to leak the whole tank of oil such a serious accident. Therefore, at least one cartridge type check valve is needed from the test bench to the tank.
- We know like proportional valve rated flow test loop pressure difference is only 10bar, and know that the higher the pressure is relatively easy to control. In addition to providing directional control, the cartridge type check valve also functions as an optional throttling device. There is an idea to use the return check valve to slightly increase the return pressure. This approach aims to reduce the difficulties associated with differential pressure control.
- In summary, how much opening pressure is appropriate, please think?
Cartridge type check valve bridges
Bidirectional gear flowmeters for high pressure and high flow are now readily available from VSE. It is important to know that in earlier years, obtaining a bi-directional flowmeter with the right accuracy for high pressure and large flow ranges was not easy. At that time, only poor-quality unidirectional flowmeters were available, and people had to find ways to use them.
Thus, you can integrate four cartridge type check valves to create a liquid bridge. This setup allows you to test whether the oil flows from A to B or from B to A. It also ensures that the flow direction matches the requirements for the flowmeter.
safety first
There has been an incident where a pump station tested a machine. One day, the oil pipe at the pump outlet detached and flew out of the pump room, smashing through a wall large enough for a person to drill through. Fortunately, no one was present at the scene, so it did not cause a major incident. Upon investigation, it was found that the issue was caused by a tube-type check valve installed in reverse. The workers explained that they might have reinstalled the valve incorrectly after dismantling it. Alternatively, they suggested that there could have been an error with the valve’s arrow marking.
Valve dismantled and reinstalled the wrong valve or valve on the arrow marking error, time has passed a long time has been no way to prove. However, the warning remains significant. Revisiting the initial question, if the check valve and the loading valve between the pump can avoid machine accidents, the issue still persists. Although the loading pump may unload, the pressure in the valve chamber remains high after the check valve. Consequently, removing the test valve at this stage is not possible.
Therefore, you must repeatedly confirm the pump port directly connected to the cartridge type check valve. If necessary, you can also consider separately testing the check valve before use.
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