The plate heat exchanger is made up of many stamped corrugated thin plates at a certain interval, sealed by gaskets and laminated and compacted by a frame and a compression screw. The four corner holes of the plates and gaskets form fluid distribution pipes and collection pipes. It reasonably separates the hot and cold fluids and makes them flow in the flow channels on both sides of the plate for heat exchange. Plate heat exchangers generally do not need special operating precautions during normal use. As long as the provided medium and temperature do not exceed the design values at the time, they can generally be used all the time. But some working conditions need to be dismantled and washed regularly. During the use of such working conditions, relatively professional experience in the operation process of the plate heat exchanger is required. So what are the precautions before starting and stopping the plate heat exchanger?
(1) When the plate heat exchanger is turned on, the outlet valve must be opened first, and then the inlet valve must be opened slowly. The purpose is to empty the air inside and avoid transient over-pressure causing plate stress deformation.
(2) When the plate heat exchanger is shut down, the inlet valve must be closed first, and then the outlet valve must be closed.
(3) When the plate heat exchanger is started and stopped, the hot side must be closed (open the cold test valve when starting) to avoid the phenomenon of empty burning and loss of plates and rubber pads.