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Message: <blockquote data-quote="Kelsey" data-source="post: 2602187" data-attributes="member: 209055"><p>The trv is on the wrong end. Older types of trv had to be on the flow pipe to the rad, if they were on the return they would 'hammer' as they got to the point of shutting down because the water would be pushing on the valve [that's why it stops when you adjust it]. Modern trvs can be fitted on either end and are termed as reverse flow or two way. Your easiest solution is to replace the trv for a modern one.</p></blockquote><p></p>