Simplex Pump
 

 
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The Simplex, or Single-Cylinder Double Acting, Pump was invented in 1840 by Henry R. Worthington. A Simplex Pump is a reciprocating pump. This pump has a single liquid cylinder which forces liquid out through the top outlet on both the in and the out stroke (here up and down.)

This basic type of pump might be used for Air Pumps, Feed Pumps for the furnace, Fire, Bilge, and Fuel Oil Service. All might rely on this fundamental pump.

The DUPLEX PUMP is similar to the Simplex pump, having two pistons instead of one, providing smoother operation. From the outside a simplex pump can take many forms but the basic concept follows this illustration.

 
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