I have two 2 port Danfoss HP2A motorised valves on my system and it seems as though I am replacing alternate actuators every year or so, is there an alternative actuator that that is more reliable and a direct replacement?
Danfoss HPA2
- Thread starter Farcetboy
- Start date
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Unfortunately for Danfoss, the trade prefer using the Honeywell units.
They feature a plastic or rubber ball which is motored away on a pivot arm from the brass valve seating, and returns by spring. By using a ball, it is very difficult to get stuck with detritus. A further feature to promote longevity in the Honeywell design is that the ball itself is free to rotate, in principle allowing wear to be apportioned across the entire circumference.
Some other makes use machined brass inserts which are rather intolerent to flakes of rust and other solids in the water seizing up the action.
If you are changing any quality make of valve every two years it suggests your system has a lot of cack in solution........ not good
.
They feature a plastic or rubber ball which is motored away on a pivot arm from the brass valve seating, and returns by spring. By using a ball, it is very difficult to get stuck with detritus. A further feature to promote longevity in the Honeywell design is that the ball itself is free to rotate, in principle allowing wear to be apportioned across the entire circumference.
Some other makes use machined brass inserts which are rather intolerent to flakes of rust and other solids in the water seizing up the action.
If you are changing any quality make of valve every two years it suggests your system has a lot of cack in solution........ not good
.Hi simon
Thanks for a quick reply, I didn't word my question very well it is the actuator that I'm replacing
Thanks for a quick reply, I didn't word my question very well it is the actuator that I'm replacing
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Oh the Danfoss valve. Usually the mirco switch fails and it can fail on even when the valve is shut. Letting the boiler and pump run untill its boils. Happened on my own system, different valve fitted now.
Did you fit a complete new valve or just a different actuator?
I changed the valve completely but as ChrisR says Sunvic do one but can't remember which.
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