Boiler feed water pump outlet double check valve with self-starting function
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As the title suggests, what are the benefits of having dual check valves at the outlet of the boiler feed water pump?
In the standby state of a centrifugal pump with self-starting capability, its outlet valve is open, and of course the inlet valve is also not closed. In such a condition, any leakage from the check valve will inevitably cause the pump to rotate in reverse, and the hazards associated with this are well known. Adding double check valves might be intended to prevent such issues. Speaking of check valves, are there any particularly reliable types? Especially at larger diameters, the internal shafts and bushings of common swing check valves suffer significant wear, which often leads to problems.
Your analysis is correct; given the operating conditions and importance of this pump, a dual check valve was installed