Pulsafeeder Pulsa GLM DM7 User Manual download pdf (Page 8)

5.4 Discharge Pressure Requirements

All GLM

DM7 metering pumps are designed for continuous service at the rated

discharge pressure. If system suction pressure exceeds discharge pressure (a

condition sometimes described as “pumping downhill”), flow would be generated

(siphoning) in addition to that caused 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 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

pump’s rating are to be avoided as they will cause damage to the pump components.

Figure 3, sample system

configuration

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 32 33

No comments

Pulsafeeder Pulsa GLM DM7 User Manual Page 8