The following diagrams have been developed to serve as a guideline for plumbing agricultural and turf sprayers. Similar manual valves may be substituted for electric valves. However, the sequence in which these valves occur should remain the same. Note that one of the most common causes of premature valve failure is improper installation.
Positive Displacement Pump
Piston, roller and diaphragm pumps are all types of positive displacement pumps. This means that pump output is proportional to speed and virtually independent of pressure. A key component in a positive displacement system is the pressure relief valve. Proper placement and sizing of the pressure relief valve is essential for safe and accurate operation of a positive displacement pump
Two-Way
Plumbing Diagram (Positive
Displacement)
Three-Way Plumbing Diagram (Positive
Displacement)
Non-Positive Displacement Pump
The centrifugal pump is the most common non-positive displacement pump. The output from this type of pump is influenced by pressure. This pump is ideal for delivering large volumes of liquid at low pressures. A key component of the centrifugal pump is the throttling valve. A manual throttling valve on the main output line is essential for the accurate operation of the centrifugal pump.
Two-Way Plumbing Diagram (Non-Positive
Displacement)