Positive displacement rotary pumps are pumps that move fluid using the principles of rotation. The vacuum created by the rotation of the pump captures and draws in the liquid.
The low pulsation rate and gentle performance of this Roots-type positive displacement pump is achieved due to a combination of its two 90° helical twisted rotors, and a triangular shaped sealing line configuration, both at the point of suction and at the point of discharge.
Five years of Republicans' failed energy policies have resulted in Americans paying twice as much at the pump as they did in 2001, while big oil companies make triple the profits. Russ Carnahan
Even if gas prices fall, consumers will continue to be gouged at the pump the only thing that we can be sure rises faster that the price of gasoline is the skyrocketing profits of oil companies. Major R. Owens
With only 2 percent of the world's proven reserves of oil, we in the United States can pump until we are blue in the face and it will not change the fact that we need more diverse and more secure sources of energy. Zack Wamp
What the president announced yesterday, is that somehow magically, if we just continue to prime the pump of taxpayer dollars, we're going to see magically an economic recovery. Eric Cantor
A vacuum cleaner (also hoover in colloquial British English) is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors.
Energy companies, such as Chevron and Shell, and oil producing countries, such as Kuwait and Venezuela, pump crude oil from their vast land holdings and sell it on the world market. Gary Miller
There was a moth in there, and it still had its wings crumpled up, and it was just starting to pump its wings up. Life continues in lots of places, and life is a magical thing. Laurel Clark
For far too long, America has been without a comprehensive energy plan, and today consumers are paying the price - literally - at the pump and in their heating bills. Chris Chocola
