Change the position of the pump preheating wire
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As shown in the figure, the preheating wire of the pump only crosses the one-way valve. In order to preheat the flow, the outlet valve must be slightly open. Over time, the small flow of the valve disc will cause the sealing to be washed away, resulting in the inability to effectively close during maintenance and internal leakage. The preheating wire is changed from crossing the pump outlet check valve to increasing the span of the outlet valve. In this way, the outlet valve does not need to be opened for preheating circulation, but the disadvantage is that the length of the preheating dead zone at the outlet valve is increased. The preheating wire on site only crosses the outlet check valve. I would like to ask everyone if this change can reduce the internal leakage of the valve. I have considered adding an outlet valve, but the investment is too high.
The heating pump line spans the one-way valve and the outlet valve.
The preheating flow is very small and has negligible impact on the valve. Profile
Yes, this way the backup pump outlet valve can achieve preheated circulation without overdoing it.
There is a lot of internal leakage in the pump outlet valve. I have consulted other masters and some said that long-term low flow flushing is the main cause of internal leakage in the valve.
It originally spans these two valves, not just the check valve.
I don’t know whether the distance between the outlet valve and the check valve is too long, and whether the preheating requirements are strict. If you do not consider these two items and just consider the damage of the fluid to the valve, it is okay. It is also recommended that this preheating valve should be a high-pressure valve with a higher pressure level, whose quality is better than valves with the same pressure level. But there is a problem that should be considered. Once the valve is broken, repair the pump. It is recommended to consider everything comprehensively.
Consider installing a restrictor orifice plate. Also, what is the medium?
Each of the six protection lines of the pump has its own purpose. The warm pump line, as the name suggests, is used to warm the pump, and the emphasis is on the standby pump. The high-temperature medium comes from the operating pump through the warm pump pipeline cut-off valve, and flows into the standby pump through the orifice plate restriction, so that the standby pump is in a hot standby state. Therefore, it is more reasonable to locate it at the smallest position after the exit. The picture below is more typical
All the pumps in the device are of plan one, and the medium is basically triphenyl.
We here only cross the one-way valve. We think that if we cross the outlet valve together, if there is a problem such as leakage in the pump line, it cannot be removed and cannot be repaired online.