Pulsafeeder Pulsa GLM DM1-6 User Manual download pdf (Page 8)

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

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Pulsafeeder Pulsa GLM DM1-6 User Manual Page 8