The item may be missing the original packaging or protective wrapping, or may be in the original packaging but not sealed.

It is designed to protect the unvented cylinder by controlling the main supply pressure that goes to the tank and is not designed to regulate the pressure of the entire property. Unvented heating system has a caleffi pressure reducing valve, 3 bar with 6 bar safety release valve. Since there are three 22mm pipes to hook up and the 15mm outflow you would probably otherwise need a 'union' to be able to make the connection to the tundish. But thought best to change the whole thing, and now 6 months later dripping again, to my knowledge not been activated, so annoying faulty again after such short period?The charge in the expansion vessel should be the same as the incoming pressure that is set/ controlled by the pressure reducing valve.

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Caleffi is a decent make, I understand, but these fellows - well, the safety-release-valves - are prone to allowing a drip through after they've been activated. It has been reconfigured from the original in that the 15mm outflow pipe is an easier connection due to it now being a swivel connector. The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. This multibloc is comprised of a pressure reducing valve, a pressure relief valve, and an internal check valve.

They help us to identify popular products and understand your browsing habits so we can display relevant adverts to you. Specially shaped diaphragm to give accurate pressure regulation in response to changes in downstream pressure. Another possibility that I forgot to mention is that the expansion vessel could be undersized - if the EV cannot cope with the amount of hot water expansion in the system it will then have to go somewhere else (the PRV).