Please Identify Ancient Motorised Valve

[plumbandplumber]

More heating problems. We have a very old vented, fully pumped ch system and Thorne Olympic boiler. The heating is coming on with the hot water and I suspect the motorised valve. I think it's from the same era as the boiler, and I can't see any markings on it to identify it. From the picture can anyone tell me what make/model it is and if they are still available?

Many thanks.

 

[ShaunCorbs]

No there not still available looks like an old servowarm or sunvic

 

[heliotrope]

You won't get this one anymore but easily replaced with
a honeywell two port valve.

 

[plumbandplumber]

Thanks for your replies. Will a Honeywell fit in the pipework without any alterations? Will it have the same number of wires and same wire colours?

 

[ShaunCorbs]

Probably not but it should with not much work eg a coupling and a short but of pipe

 

[Last Plumber]

It's a Satchwell.
I would replace it with a Honeywell
You'll probably need to change the nuts and olives.

 

[plumbandplumber]

Thanks for your replies.

Yes, Satchwell/Sunvic by the looks of it. However, it looks like it may be a motor on, motor off valve. Will the wiring be a straight swap to the Honeywell, or do I need to make changes.

 

[jtsplumbing]

call Honeywell Tec they will tell you what go's where

 

[Best]

It does have 'Satchwell' printed on it, which is probably a clue!
Bloody amazing for their long lifespan!
I use Myson motorised valves now because the Honeywells were not lasting

 

[plumbandplumber]

Looks like they're still available as old stock.

Sunvic SM4203 Actuator 5 Wire Valve Head 2 Port Mini Valve Replacement (A408) | eBay

 

[plumbandplumber]

Wondered if it might be worth replacing the head with the 5203 which seems to be a direct replacement. Or is the valve/main body part likely to be worn out too?

I can't see any screws to remove the cover from my valve.

Sunvic (Satchwell) SM5203 Actuator

 

[Sharp Point]

I wish present day mid position and zone valves , lasted this long

 

[Best]

Don't expect the modern Sunvic actuator to last long.
I would replace entire valve because of the wear that old valve will have.