Sequence for opening (closing) valves when starting (shutting down) a plate heat exchanger
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1. When starting up a plate heat exchanger, first open the outlet valve, then open the inlet valve for the low-temperature medium, and finally open the inlet valve for the high-temperature medium. 2. When shutting down a plate heat exchanger, first close the inlet valve for the high-temperature medium, then close the inlet valve for the low-temperature medium, and finally close the outlet valve.
Regardless of the order, it is important to control the degree of valve closure while driving; too high a flow rate may cause the plates to be damaged, so the valve should be opened slowly