“Daily Share 4.20”: The function of the heat pump circuit

It is mainly to protect the pump body from damage caused by sudden increases or decreases in temperature.

1. Warm-up pump line – When transporting high-temperature oils with a temperature exceeding 200°C, and a spare pump is available, this pump is used for warming up the system； 2. Low-flow line – When the pump’s operating flow rate is 30% below its rated flow rate, a low-flow line should be provided to allow the pump to operate normally at that lower flow rate ； 3. Balance line – For liquids with a saturated vapor pressure at room temperature that is higher than atmospheric pressure, or liquids in the bubble point state, a balance line should be installed to prevent vapor from forming in the liquid entering the pump or bubbles from entering the pump and causing cavitation ； 4. Bypass line – used for the trial operation of the pump, or to keep the pump running when the main outlet valve is closed under abnormal operating conditions. Bypass valves equipped with flow-limiting orifices are generally installed in situations where the pressure difference before and after the valve is very high ； 5. Anti-freezing measures – When transporting liquids with a high pour point or high freezing point that solidify at normal temperatures, anti-freezing measures should be implemented in the standby pumps and pipelines to prevent them from getting clogged ； 6. Safety valve line – For positive displacement pumps such as electric reciprocating pumps, gear pumps, and screw pumps, a safety valve line is provided on the outlet side; when the outlet pressure exceeds a set value, the safety valve opens and the fluid returns to the pump’s inlet pipe. Common centralized piping found on ordinary pumps~~~

Prevent damage to the pump body caused by sudden spikes and drops in temperature

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To prevent the pump from being damaged by a sudden rise in temperature, high-temperature pumps mainly use warm-up wires