Views: 90 Author: Site Editor Publish Time: 2022-10-18 Origin: Site
Check the pump for cavitation. Slowly reduce the pump speed to allow thick material to flow into the fluid chamber.
Verify that the vacuum required for the height of the fluid suction rise is not greater than the vapour pressure of the material to be pumped (cavitation).
Check that the ball check valve is not sticking. If the material to be pumped is not compatible with the pump elastomer, swelling may occur. Replace the ball check valve and seat with a suitable elastomer. Alternatively, as the check valve balls wear, they will become smaller and may become stuck in the seat. In this case, replace the ball and seat.
Check that the discharge isolation valve is closed.
Check that the electrical signal is not so slow that the individual physical strokes cannot be completed before the signal to change direction is given. The time required to complete a stroke is determined by a number of factors, including fluid viscosity and pressure in the pressure head. If the muffler is removed, the shaft is visible (not available on all models).
Ensure that the air supply pressure is high enough to meet the application head pressure requirements.
Check the pump for cavitation; reduce the pump speed to match the thickness of the material to be pumped.
Check that the ball check valve is not sticking. If the material to be pumped is not compatible with the pump elastomer, swelling may occur. Replace the ball check valve and O-ring with a suitable elastomer.
Check and ensure that all suction connections are airtight and that the clamping rings are properly tightened.
Check the pump for cavitation; reduce the pump speed to match the thickness of the material to be pumped.
Check that the ball check valve is not sticking. If the material to be pumped is not compatible with the pump elastomer, swelling may occur. Replace the ball check valve and O-ring with a suitable elastomer.
Check and ensure that all suction connections are gas-tight, especially the clamping ring around the air inlet.
Check that there is not too much moisture in the compressed air. Install a dryer or hot air generator to produce compressed air. Alternatively, in some applications, an agglomeration filter can be used to remove the moisture from the compressed air.
Air bubbles in the pump discharge port.
Check for a ruptured diaphragm.
Check the seal of the outer piston.
Check the sealing of the fasteners and the integrity of the O-rings and seals, especially at the intake manifold.
Ensure pipe connections are air tight.
Check that the diaphragm is not ruptured.
Check the sealing of the outer piston to the shaft.
Form the wrong discharge pressure head or suction lift height
The voltage is incorrect, the solenoid valve is faulty or becomes dirty.
The voltage is incorrect, the coil or wiring is bad.
Insufficient air supply, pollution, insufficient or improper lubrication and bonding of the valve
Spring breakage, mechanical bonding.
Wear of seals in the air valve.
Check if there is excess moisture in the compressed air line. As air is expelled from the exhaust port during pump operation, the water vapour trapped in the compressed air can freeze and block the air passages in the pump. If this happens, it may be necessary to install a coalescing filter, air dryer or a hot air generator for compressed air.