What aspects should be considered to analyze the reasons for unstable flow in a plunger pump?
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The outlet flow rate of the plunger pump that was newly installed in the workshop is unstable – what are the possible causes? Is it called three-stage when three plungers act simultaneously?
If the flow is unstable, check whether the check valve is damaged.
Thank you for your reply, but it’s not a problem with the check valve.
Unstable flow rate can be caused by the following issues: 1. Plunger seal leakage; 2. Improper sealing of the inlet and outlet valves; 3. Gas present inside the pump; 4. Insufficient number of reciprocations; 5. Inadequate opening degree or blockage of the inlet and outlet valves; 6. Clogged filter; 7. Insufficient liquid level
Reasons for unstable flow: 1. It is possible that one or several packing elements are damaged, resulting in high external leakage. 2. There are problems with the one-way valve components in each group, such as issues with the sealing surface of the valve core, spring jams, poor sealing when opening and closing, and the presence of foreign objects stuck inside. 3. There is an object in the inlet or air in the pipe, and the inlet filter is clogged. 4. There is a problem with the outlet check valve. Wait, the above possibilities still need to be determined based on the specific conditions at the site. I’m just mentioning this based on what we’ve encountered in the past; there might be other abnormal or special cases as well. Let’s take another look.
The analysis is as follows: 1. The medium is dirty, and particles blocking the check valve cause wear on the surface of the ceramic ball or the valve seat. 2. Air leakage at the sealing packing or the inlet pipeline. 3. Insufficient diaphragm fluid. The solution is: 1. Install a filter at the pump inlet. 2. Tighten the packing gland or inlet flange. 3. Add diaphragm fluid.
I agree with the reasons for unstable traffic mentioned by those above. What I want to say is that the structure and operating characteristics of piston pumps result in a flow rate that is \"pulsated\". So I’m not sure how severe the “unstable traffic” issue is that the original poster mentioned – whether it’s normal or abnormal.
Is it called three-stage when three plungers act simultaneously? Answer: I don’t think it should be called level three!