A Double-Disc Solution

Reciprocating positive displacement pump from Penn Valley Pump fits multiple wastewater applications
A Double-Disc Solution
Preston Campbell, middle, vice president of sales for Penn Valley Pump Co., and Steve Truitt, right, the company’s Midwest regional sales manager, discuss the operating principle behind the Double Disc Pump with an attendee at the 2015 Water & Wastewater Equipment, Treatment & Transport (WWETT) Show. The pump combines the mechanism of a positive displacement pump with the principle of induced flow.

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Sometimes simpler is better. That’s the main idea behind the Double Disc Pump, presented by Penn Valley Pump Co. at the 2015 Water & Wastewater Equipment, Treatment & Transport (WWETT) Show.

“It’s really a simple product designed to provide long operation time between rebuilds,” says Preston Campbell, vice president of sales. “It requires little maintenance because there are few moving parts and wear parts. It accomplishes more with less.”

The pump combines the mechanism of a positive displacement pump with the principle of induced flow. Its discs perform the duties of both diaphragm and valve, providing a double-acting, non-clogging pump action. The arrangement of connecting rods and camshaft creates a reciprocating action of the discs, forming a large cavity that is filled and exhausted in a continuous flow. 

The discs have large seating areas that provide for low internal velocities, extending wear life. It doesn’t rely on close tolerances within the pump chamber to generate flow, and therefore friction is eliminated. It can run dry indefinitely without damage, and the short stroke allows the pump to incorporate a nonleak sealing trunnion that requires no maintenance, seal water, packing or lubrication. The pump is self-priming and can pass up to 2-inch solids and line-size semisolids. The large-diameter discs are designed to handle large solids, flushable wipes and plastics.

“This is definitely a product geared toward wastewater with a heavier solids content,” says Campbell. “With only five wetted parts, any maintenance needed can be performed quickly to get it right back in service.”

Various versions of the pump are available, in flow rates from 2 to 1,400 gpm. Municipal applications include thickened biosolids, scum transfer, primary or digested sludge, press feed, lime slurry or truck loading. Industrial applications include the pumping of waste oil sludge, food processing waste, clay and coal slurries, and drilling mud.

“Our main target for this pump is municipal wastewater treatment plants, but there are many other applications that require efficient wastewater transfer where it fits,” says Campbell. “It’s not going to replace a vacuum pump on a truck, but there are ways of making it portable to the point where it could be used to replace a diaphragm pump or in a mobile dewatering application. We’re getting a lot of inquiries down that road from the mining industry.”

The 2015 show was Penn Valley’s first as an exhibitor, and Campbell sees an opportunity to grow his company’s reputation across the several wastewater industry sectors represented at the show.

“Being our first time here, this is as much a learning experience for us as a chance for the attendees to learn about what we offer,” says Campbell. “It gives us a chance to talk with people and see what they’re looking for, and what their process is. Then it’s determining where our products fit. So far we’ve talked to many who could use what we have.” 

215/343-8750; www.pennvalleypump.com.   


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