me123

Yes that's right just one shoe in the valve, so it needs a half turn. Therefore i don't see how the Danfoss is compatible unless the one I have is faulty..?

Can you explain what you mean by image implies 90 deg side to side? The spindle needs to turn 180 degrees (12 o clock to 6 o clock) to go from port A to port B - therefore turning the valve won't help as the actuator still won't rotate the spindle enough to move the valve between A and B. The Sunvic actuator had already been replaced in the past and an identical valve is still in the old box as only the actuator part was replaced so I am able to see inside the valve and it needs a 180 deg half turn to switch from port A to B. thanks

Hi Following a faulty actuator on a Sunvic 3 port value SDMV2304, I was advised that a compatible replacement actuator is the Danfoss HSA3 (also backed up by http://www.seered.co.uk/sunvic_low_res_catalogue.pdf). However the Danfoss only moves the spindle through 90 degrees (while to move the sunvic valve from HW to CH requires a 180 degrees turn) HW only - spindle moves to 9 o clock = Both A and B ports (so I get CH when not desired) HW & CH – spindle moves to 7.30 – still A and B ports (ok) CH only – spindle moves to 6 o clock – port A only (ok) So I am confused : a) Am I unlucky to have picked up a faulty HSA3 – should it move through 180 degrees? b) Do I need a different valve body that operates with 90 degrees turn ? Many thanks for any advice…