Reasons why the screw pump does not deliver flow
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As the title suggests, 1. The inlet filter was not clogged after being removed, but the filter screen was damaged. 2. The inlet pressure of the pump is 2 kilograms (normal), while the outlet pressure is 4.2 kilograms; it should be 8 kilograms under normal conditions. 3. Is it a problem with the pump’s relief valve? What other reasons could cause the screw pump not to deliver fluid? Please help analyze what might be the cause. Thank you.
The main reason why the screw pump fails to deliver fluid is the presence of particulate impurities in the material being transported; these impurities increase the gap between the screw of the pump and its casing, resulting in a decrease in outlet pressure and reduced flow rate. The main reason is that the imported filter screen was damaged, allowing impurities to enter the pump.
Check that the safety valve at the pump outlet is malfunctioning, causing the material to circulate between the inlet and outlet.
Check the system back pressure; theoretically, the outlet pressure of a screw pump should not be affected by flow rate.
Generally, screw pumps have an outlet return line and connection lines between the inlet and outlet – could there be a problem with them?
This screw pump is used for transporting fuel oil; is the outlet pressure related to the viscosity of the fuel oil? The line from the outlet back to the inlet has been confirmed to be closed.
Without changing the original process (ignoring process-related factors), 1. The pressure gauge is inaccurate； 2. Screw wear, excessive clearance ； 3. Leakage rate of the reflux valve ； I think what was said on the first floor is correct. It’s just my personal opinion; I’m not sure if it’s correct
Is the connection between the inlet and outlet causing internal leakage? Is the back route open? Is the traffic data accurate?
The most likely issue is with the relief valve; if it’s worn out, it should be a gradual problem rather than one where pressure doesn’t increase suddenly.
1. The motor wires are connected in reverse, resulting in incorrect direction of rotation and no production； 2. Screw wear and excessive clearance: During maintenance, components such as the screws are cleaned, which causes changes in their clearance ； 3. Pump body safety valve failure: The spring fails, causing it to activate at a pressure lower than the normal level (4.2 kilograms) ； 4. Changes in medium-related properties?
This post was last edited by yhsm2009 on 2010-3-12 02:38. 2# sonid: Do you think it’s due to a large gap in the screw? Is the wear caused by particles accumulating in that gap?