MATERIALS HANDLING Innovative Graco electric pump
provides risk-free operation Graco’s Husky™ 1050e electric double diaphragm pump offers dry running and stalling, as well as significant energy and cost savings over equivalent electric pumps and conventional air-operated diaphragm pumps.
Pump failures are a frustrating waste of time, energy and money. So it comes as no surprise to find that Graco, a world leader in fluid handling systems and components, has devoted considerable resources to attempt to eliminate them. In addition, Graco constantly seeks to improve the energy efficiency of pumps and create a quieter working environment for operators and nearby employees.
Does this seem like an impossible combination? Not with Graco’s new Husky™ 1050e electric double diaphragm pump, which has been designed to meet such a mix of demanding requirements.
“The Graco Husky 1050e is the only electric diaphragm pump on the market that will stall under pressure, to prevent pump failures from clogged lines or closed valves,” says Walter Leeten, Product Marketing Specialist Process at Graco. “Its energy efficient electric drive reduces energy consumption by up to five times compared to traditional air operated diaphragm pumps. In addition, the 1050e can be set to reduce pulsations, so you no longer need a pulsation dampener – which contributes to its low noise levels.”
The thinking behind developing an electric double diaphragm pump certainly makes sense. It will immediately remove the significant costs of purchasing, running and maintaining an air compressor. And of course you might need to run a pump in locations where no air is available – or will take a lot of time and logistics to get an air supply up and running. In these situations an electric pump is an excellent alternative.
How it works
The Husky 1050e is an electric operated 1” double diaphragm pump (EODD). It works like a conventional air-operated double diaphragm pump (AODD). However, don’t view the 1050e merely as an AODD connected to the nearest electricity supply instead of an air compressor. There’s some innovative stand-out technology inside.
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The 1050e consists of the same fluid parts as a conventional AODD. Where it differs is that it uses an air pressurized center. “Compare it to a bicycle wheel,” explains Leeten. “You need to load the pump with air to start it working, but after that you don’t need a constant supply of air to keep it running. In fact you only need 0.6 liters of air a day!”
When the pressure pushing on the outside of the diaphragm (fluid pressure) is equal to or greater than the center section (air) pressure, the pump will stall, removing the risk of pressure being built up. This avoids damaging the pump or the production line.
If then the air pressure in the center section increases so that it is greater than the fluid pressure, or the fluid pressure decreases so that it is less than the air pressure, the pump will start pumping again. The motor will keep running all the time.
Interesting advantages over AODDs One of the key advantages of the Husky 1050e is that it stalls under pressure. Historically, pneumatic diaphragm pumps stall under pressure, which makes them unique. Electric motors typically do not stall under pressure, but the 1050e does; the only electric diaphragm pump to do so. Stalling under pressure avoids the risk of damaging the pump or pipeline when it’s blocked or a valve is closed. It also negates the necessity for installing an extra pressure sensor.
The 1050e also comes into its own in applications that require low pulsation and a smooth flow. The patented air charged drive allows for the elimination or reduction of pulsation without expensive pulsation dampeners or surge tanks.
It also gives a good level of control – especially important for metering and batching. And there is no risk of contamination of products due to the absence of hydraulic backing.
Its seal-less diaphragm pump design eliminates leaking rotational seals and failures due to run-dry pump conditions. Other advantages include the lack of exhaust air, the ability to handle abrasives, and its quietness, making it ideal for applications in close proximity to people.
Significant cost savings Now let’s look at the bottom line: operating costs. It’s interesting to compare the 1050e EODD 1” with a conventional 1” AODD; both operating for 24 hours at a flow rate of 95 liters per minute and a fluid pressure of 3.5 bar.
The required air for the 1050e is a paltry 0.6 liters PER DAY. Compare this to the
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