Hi can someone clarify this?
I have recently started a new job as a Facilities Manager, and one of the plumbing contractors said that he noticed an issue while he was working on a cylinder in a flat “the expansion vessel is being fed by the cold-water pipework, which includes a non-return valve between it and the cylinder, and that the non-return valve between the expansion vessel and the cylinder will render the expansion vessel ineffective, as it obstructs the necessary flow for pressure regulation?” I have contacted...