Duplex Closed-Loop Water-Sealed Liquid Ring Priming Systems
Q-VAC’s duplex priming systems using closed-loop, water-sealed liquid ring vacuum pumps are a great choice for priming applications where the attributes of liquid ring technology are preferred, but a continuous supply of seal water is either not available or needs to be conserved. Instead of continuously supplying new seal water to the vacuum pump like a typical water sealed system, a small water reservoir and air-cooled heat exchanger are utilized in a closed loop arrangement. This design allows the vacuum pump to run continuously without overheating and without needing a large seal water tank to dissipate heat. If the seal water reservoir level drops too low due to evaporation, a level switch will activate an alarm circuit to protect the vacuum pump and notify the operators.
Since two vacuum pumps operate together during initial priming, smaller vacuum pumps can be selected without sacrificing performance. However, to maximize efficiency after the initial prime, only one vacuum pump runs during normal operation to restore system vacuum. Not only does this reduce power consumption and operating costs, it also reduces the runtime on each vacuum pump to extend maintenance intervals and maximize life. Finally, to ensure that neither vacuum pump becomes damaged due to non-use, the controls are designed to operate each vacuum pump in a lead-lag fashion and automatically alternate duty to balance the run hours.
Q-VAC’s of closed-loop water-sealed liquid ring vacuum pump priming systems are available in sizes from 1.5 HP and larger. PLC controls are standard to provide increased safety, enhanced features, and the most reliable operation.