1. 
   Piston (or Ram) pump
   See pump v.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   Piston pump
   A piston pump is a type of positive displacement pump where the high-pressure seal reciprocates with the piston. Piston pumps can be used to move liquids or compress gases. ==Types== Note: the first piston pump (called siphon) was invented by Ctesibius ...
   Found op http://en.wikipedia.org/wiki/Piston_pump
   
   
3. 
   Piston pump
   A piston pump is a machine for delivering liquids or gases, whereby gases may also be compressed. In the first part of the cycle, the medium to be pumped is drawn up through an inlet valve by a piston moving inside a cylinder. This is then discharged through an outlet valve. This process is also ref...
   Found op http://www.adixen.co.uk//Applications_and_more/Glossary(1-64--3-20011).html
   
   
4. 
   piston pump
   (from the article `pump`) The plunger pump is the oldest type in common use. Piston and plunger pumps consist of a cylinder in which a piston or plunger moves back and forth. ...
   Found op http://www.britannica.com/eb/a-z/p/73
   
   
5. 
   Pistonless pump
   A Pistonless pump is a type of pump designed to move fluids without any moving parts other than three chamber valves. The pump contains a chamber which has a valved inlet from the fluid to be pumped, a valved outlet - both of these at the bottom of the pump, and a pressurant inlet at the top of the...
   Found op http://en.wikipedia.org/wiki/Pistonless_pump
   
   

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