What are the specific reasons why a plunger-type metering pump does not deliver any flow or delivers flow at a slow rate?
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What are the specific reasons why a plunger-type metering pump does not deliver any flow or delivers flow at a slow rate?
Mainly check whether there is wear on the plunger ring and whether problems with the inlet and outlet check valves are causing internal leakage
Based on the situation in our factory, we first check whether the inlet and outlet check valves have internal leakage. Look at the plunger again.
Reasons for no drainage at all: Check whether the suction pipeline is blocked or leaking, and whether the suction height is too high. Reasons for insufficient discharge volume: local blockage in the suction pipeline, debris stuck in the inlet and outlet check valves, worn valves with poor sealing; check whether the motor is functioning properly.
Reasons for no drainage at all: Check whether the suction pipeline is blocked or leaking, and whether the suction height is too high. Reasons for insufficient discharge volume: local blockage in the suction pipeline, debris stuck in the inlet and outlet check valves, worn valves with poor sealing; check whether the motor is functioning properly.
Plunger seal leakage； The valve surface of the intake or exhaust valve is damaged or contaminated by foreign debris, resulting in poor sealing of the valve surface ； There is gas inside the pump ； The number of back-and-forth cycles is insufficient ； Inhalation tube blocked ； The liquid level in the inhaler is too low ； The viscosity or specific gravity of the medium is too high.
Is there something stuck or corroded in the inlet and outlet check valves? Is the inlet filter clogged? Has the zero position of the stroke adjustment mechanism shifted, or was it not reset after maintenance?
It is also necessary to check thoroughly whether a control valve should be added. In addition to mechanical failures of the pump itself, factors such as whether the pipeline is blocked and the properties of the medium also need to be considered.