Diaphragm Pumps for Direct Drive (Engine or Motor)
Large Shaft-Driven Diaphragm Pumps
Larger shaft-driven diaphragm pumps that can be driven from engines or motors are very popular for high pressure tree spraying and lawn spraying (up to 725 PSI). Some models of these diaphragm pumps for direct drive can also provide higher flowrates up to 30, 40 or even 60 GPM. Models are available to run at 550 RPM with 6:1 Gear-Reduction Engines and other models include built-in gear reduction units in order to run with standard 3600 RPM engines. Pressure control units are also available for all models.
Yet another type of larger shaft-driven diaphragm pump is the Wanner Hydra-Cell Pump. These pumps will provide pressures to 1500 PSI or even 2500 PSI and flowrates to 36 GPM. They can also be manufactured with a variety of metals and elastomers for aggressive chemicals, acidic solutions, wettable powders, slurries, abrasives and hot liquids.
Small Motor Driven Diaphragm Pumps (12, 24 or 115 Volt)
These small diaphragm pumps usually have 3/8", 1/2" or 3/4" inlet and outlet ports and flowrates from 1 to 7 GPM. They typically develop pressures to 60 PSI and even 100 PSI in some cases. These small, motor-driven diaphragm pumps are made in two distinct styles. The first is the "Demand" Style which includes a built-in pressure switch to automatically stop and start the pump at specific pressure settings; this style is the most popular. The other one is the "By-Pass" Style where the pump continues to run regardless of pressure in the system but internally bypasses flow if the discharge valve is closed. However, if the discharge valve is closed for more than a minute or two, overheating of the liquid can occur and damage the pump internals.
Udor Pumps 
Remco Pumps 
Shurflo Pumps 
CDS John Blue Pumps 
Flojet Pumps 
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