Intaeco flow regulating valves, that by manual adjustment can regulate the flow to any value between 2 and 12 litres per minute. Intaeco also have optional versions that can regulate 8 to 28 litres per minute.
The flow regulating valves have integral filling and flush ports with isolation valves. The top valve has a 'L' way action, which means whenthe port is opened, the the normal system flow through the valve is closed, allowing the lower flushing port to come into play.
Connections are 1" BSP female on the top, with direct connection to the solar pump in mind, however if the installer decides to locateelsewhere in the system, a 22mm x 1" male compression connector (available at all plumbers merchants trade counters) will convert back to copper. Like wise a SF20-0175R reducer (see list of fittings) will adapt the top connection to DN16 pipe. Lower connections are all direct to pipe, either 22mm copper or DN16 SS pipe.