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DOES YOUR PROGRESSIVE CAVITY PUMP NOT START? These positive displacement screw pumps are great for moving thick paste-like fluids at an even speed and pressure but are often problematic with abrasive and aggressive waste-streams.To get more news about Screw pump rotor, you can visit official website. Whatever your application, if you have an issue with a faulty progressive cavity pump try this checklist for possible solutions. Here's our trouble-shooter for a variety of progressive cavity pump (screw-pump) issues: Check the power supply matches the pump motor voltage and amps. Check that the fuses haven’t blown. Has the pump been idle for some time? The rotor and stator may have ‘bonded’, if it doesn’t turn then check for dried debris and lubricate with an appropriate oil or glycerin. Has the cable or its connections been damaged? If so, have the damaged section replaced. Check that the motor windings haven’t burnt out. Have the pumped fluid’s properties changed? Tight tolerances on progressive cavity pumps mean that if the media’s viscosity or temperature do not match the pump’s specification it can lead to thermal expansion. This could burn the rotor and stator where they rub or even jam it, stopping all movement and putting strain on the motor. Examine the rotor to make sure it's not blocked or jammed. If it is, then withdraw it from the pump, clean down and if there is no damage evident, reassemble. Try reducing the pump’s rotation speed before switching it on, also check the delta start settings if it is an older 3-phase motor, or invertor settings on a newer 3-phase. Generally, the larger the motor, the longer the time delay between start up and full power is needed. If the pump starts okay on a low speed, wait until it has discharged steadily for a time before increasing speed step-by-step to normal operation. IS THE PUMP GIVING TOO LITTLE OUTPUT? Check the feed intake is supplied and that the pump’s inlet is fully submerged. Stop the pump and isolate the power while you check for blockages at either end. Check the motor is rotating in the correct direction. If not, the wiring needs correcting before it is started up again. Has performance reduced over time? Check the wear parts and replace them if worn out. Progressive cavity pumps rely on tight tolerances and abrasive slurries can soon wear down the stator walling and rotor edges. Examine the discharge pipework and replace it if leaking or cracked. Another reason why the pump may be giving too little output is if the final discharge head is too high; where this is the case, you may need to use a larger pump or an alternative type. Check that the rotation speed is correct. Reduced speed for the same power draw could indicate something jamming inside the pump, or the fluid’s viscosity is too high for the pump configuration.
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