Before a hydraulic vane pump can do its job, it needs to be primed. That means getting rid of trapped air and filling the pump with hydraulic oil. If you’re a hydraulic system manufacturer, this article will help you understand how to prime the pump correctly.
Why Doesn’t Priming Always Go Smoothly？
Prior to proceeding directly to the steps, pay attention to a few conditions that will complicate priming. Oil condition, suction leak, installation orientation, or even loading conditions. Any one of these can affect the process or not allow air to flush out properly. Knowing this upfront helps you troubleshoot faster if priming doesn’t go as planned.
How to Prime a Hydraulic Vane Pump: Step by Step
When we “prime” a hydraulic vane pump, it is more than just being filled with oil. The process actually consists of two operations: venting and filling. Both are necessary—leaving either one out can lead to cavitation, unstable flow, or reduced pump reliability.
How to Fill a Hydraulic Vane Pump with Oil？
Step 1: Check for Seals
Prior to oil filling, check that the hydraulic vane pump cartridge kits and whole system components are in place. Secure all joints and connections to ensure no leakage hazard.
Step 2: Add Hydraulic Oil
Top up the reservoir to the recommended level by the manufacturer with the required hydraulic oil. Provide adequate cleanliness and quantity to prevent cavitation or destruction during your application of the pump.
How to Vent Air From a Hydraulic Vane Pump?
Step 1: Vent the Bleed Valve or Air Release Valve
At the hydraulic system’s top, loosen the screw of the bleed valve or air release valve to vent the trapped air through the vent. Observe the oil flow until the oil flows smoothly without bubbles, indicating that the air has been largely evacuated.
Step 2: Run the Pump at Low Speed
Turn on the pump and let it run for a few seconds to initiate fluid circulation and expel air from the system. Ensure your system is not under load at this stage; the goal is simply to allow the system to slowly circulate and purge air.
Step 3: Repeat the Process
If you still observe bubbles in the hydraulic fluid, repeat the process of refilling the fluid and air bleeding until the system is free from air.
Step 4: Check Oil Flow and Pressure Stability
You have to observe the flow and pressure of the hydraulic system to see that the oil flows freely without bubbles and the pressure is stable.
Step 5: Turn off the Bleed Valve or Air Release Valve
After the system startup is finished, secure the bleed valve or air release valve connection and gradually return the pump to its regular operating load and speed.
Precautions for Priming Hydraulic Vane Pumps
When starting a hydraulic vane pump, certain details directly impact efficiency and service life, requiring special attention.
Refer to the instruction manual
Priming procedures may vary for different hydraulic vane pump models. For that reason, you are obliged to closely read the manufacturer’s manual prior to priming your pump and strictly follow the instructions while operating your hydraulic pump.
Preheat the Oil
If oil temperature falls short of what is appropriate, hydraulic oil viscosity increases, flow resistance is higher, and startup hydraulic pump motor load is heavier—perhaps hindering the pump from starting. Thus, if the ambient temperature falls to around 5–10°C, you should preheat the oil before starting the system.
Utilize Filter Elements of the Suggested Precision
The stator, rotor, and vanes in hydraulic vane pumps have extremely tight clearances. Impurities that enter the pump chamber cause wear and leakage, which results in reduced performance. To prevent this, you should use hydraulic filter with accuracy as suggested by the manufacturer in your system to ensure oil cleanliness in accordance with specifications.
Extended Downtime Demands Re-Priming
Because of your prolonged downtime for machinery, hydraulic fluid may have moved back into some of the lines and admitted air into the system. Failure to re-prime will definitely generate pump vibration and noise at startup. Furthermore, low fluid levels can cause dry friction between metal components within the pump and result in reduced performance and potential leakage.
Check the state of the hydraulic fluid on a regular basis
The fluid properties of the oil—temperature, viscosity, and cleanliness—can all impact the startup performance of your hydraulic vane pump. Therefore, before every startup, you must check the condition of the hydraulic oil to determine whether it flows smoothly.
FAQ
Is it typical for a hydraulic vane pump to be noisy on startup?
No, that’s not the norm. You ought to check for air trapped, insufficient hydraulic oil, or incorrect viscosity oil. If there is noise after ruling these out, please contact us at Target right away. As a professional manufacturer of genuine Chinese hydraulic vane pumps, we can provide support.
How long will it take to complete air venting for a hydraulic vane pump?
There is no universal time. De-airing is performed when you notice no more bubbles in the oil, free flow, and balanced pressure.
How often should I change the filter element?
This is largely a function of your operating conditions. Replacement is usually recommended every few hundred to one thousand hours. Always use filter elements of precision specified by the manufacturer to ensure uniform system performance.
What should I do if I had forgotten to prime the system when closing down for an extended period?
If you have primed the hydraulic pump and run it, close it off at once. Refill the hydraulic oil first, and bleed again in order to remove all the air. Grinding of metal or noise from loud vibration can be heard; inspect the pump for scratches or leaks on the inside. If necessary, contact a professional for repair.
Conclusion
Correct priming of a hydraulic vane pump is necessary to ensure smooth and efficient hydraulic system operation. Effective practice of the priming procedures prevents issues like air entrapment, dry friction, and noise, ensuring stable equipment performance in the long run.
If there is any question in actual operation, please do not hesitate to contact us at any time. With years of experience as one of the best oem original hydraulic vane pump factories, we fully understand how does a hydraulic vane pump work. We provide full technical support from installation to maintenance.
