We have a reciprocating pump that feeds off 2 gear pumps with highly viscous sealer. There is one line coming off of the main reciprocating pump, tees off at the front gear pump and goes another 20ft to the rear gear pump. The reciprocating pump works at the same frequency throughout the cycle of 30 seconds from start to finish. The problem is, the rear gear pump finishes its job 5 seconds earlier than the front gear pump. Looks like, as soon as the rear gear pump closes, all the flow is directed to the front gear pump which increases the internal pressure and causes the sealer to leak out of the shaft seals. We have had sealer leakage out of front gear pump since we installed it. We can't reduce the rate/pressure of the reciprocating pump as it would starve the system. If I put pressure regulators just before each gear pump, would that prevent pressure surge at the front pump after rear is done ahead of time? Or do I need to put flow control valves to limit amount of sealer going into both gear pumps? If I put flow control valves, and reciprocating sealer pump is working at the same rate, how do I protect the system from destroying itself? I can't put pressure release valve on a line full of sealer… How do you think this leakage can be prevented?
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