Plate heat exchanger

A plate heat exchanger comprising:

• first heat exchanger plates and second heat exchanger plates forming first plate interspaces configured to receive a first fluid and second plate interspaces configured to receive a second fluid,
• wherein the first heat exchanger plates and the second heat exchanger plates are vertically stacked onto one another in a vertical direction and extending in parallel with a horizontal extension plane,
• wherein each first and second exchanger plate comprises a porthole extending therethrough, such that a port hole channel is formed in the vertical direction through the first heat exchanger plates and the second heat exchanger plates via the portholes,
• wherein a first heat exchanger plate and a second heat exchanger plate are joined in a fluid thigh manner via a first joining area circumscribing the port hole channel at a first radial distance from a center of the port hole channel thereby forming a first peripheral plate portion of the first heat exchanger plate extending between the first joining area and the port hole channel, and a second peripheral plate portion of the second heat exchanger plate extending between the first joining area and the port hole channel, the first peripheral plate portion and the second peripheral plate portion circumscribing the port hole channel and at least partially extending at a distance from each other in the horizontal direction,
• wherein a first section of the first peripheral plate portion extends towards the second peripheral plate portion and/or wherein a first section of the second peripheral plate portion extends towards the first peripheral plate portion at a second radial distance from the center of the port hole channel thereby forming a restricted volume between the first peripheral plate portion and the second peripheral plate portion between the first radial distance and the second radial distance, the restricted volume being in fluid communication with the port hole channel.