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Bypass valve saves installation and commissioning time
A new Flushing Bypass Valve from Marflow Hydronic Systems is designed to greatly simplify the design and installation of fan coil systems, offering significant benefits throughout the supply chain.
The new valve features 40mm centres, compared to the more traditional 80mm centres. This simple innovation, developed by Marflow, enables the valve to be incorporated inside a fan coil unit – so that it becomes part of the package supplied by the fan coil manufacturer. Not only does this reduce the onsite installation work, it also allows the increasingly used pressure independent two port control valves and actuators to be supplied with the fan coil unit in the same way as when four port control valves with actuators were the norm.
In contrast, with conventional arrangements the flushing bypass is installed separately, outside the fan coil casing, so that more onsite assembly is required and there are often grey areas of responsibility when things go wrong. Furthermore, this older arrangement is not the best option when using pressure independent two port control valves.
Explanatory notes
It is a requirement that fan coil pipework is cleaned by flushing before commissioning, a process that uses biocides and/or cleaning chemicals. These chemicals can damage the heat exchangers in the fan coil units so a bypass valve is used to divert the flushing solution around the fan coils.
The way that fan coils are manufactured means that, historically, use of 80mm-centre valves required the use of adapters so the assembly could not fit inside the fan coil.
Use of 40mm centres matches the pipe configuration in the fan coil, so that the bypass valve can be connected directly.