Pulsafeeder Pulsa GLM DM1-6 - Manual (Page 8)

4
2.5 Discharge Pressure Requirements
All PULSA GLM
®
metering pumps are designed for continuous service at the rated discharge pressure.
If the system suction pressure exceeds the discharge pressure (a condition sometimes described as
“pumping downhill”), flow will be generated in addition to that generated by the pump. This results in a
reduction in accuracy and loss of control over the metering process. To prevent this flow-through
condition, the discharge pressure must exceed the suction pressure by at least 0.35 BAR (5 PSI). This
can be achieved, where necessary, by the installation of a backpressure valve in the discharge line.
Conditions where the actual discharge pressure exceeds the pumps rating are to be avoided as they will
cause damage to the pump components.
Figure 4: PULSA GLM P&ID