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zone valve

A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system.
In the interest of improving efficiency and occupant comfort, such systems are commonly divided up into multiple zones. For example, in a house, the main floor may be served by one heating zone while the upstairs bedrooms are served by another. In this way, the heat can be directed principally to the main floor during the day and principally to the bedrooms at night, allowing the unoccupied areas to cool down.
This zoning can be accomplished in one of two ways:

Multiple circulator pumps, or
A single circulator pump and zone valves.

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  1. H

    Will a electrically operated Solenoid do the job of a 2 port Zone Valve?

    I am in the process of connecting my hydronic heating system to my hot water service as a backup means of heating water for baths etc. I have a stainless steel plate heat exchanger installed inside the hot water cylinder which is connected to a pump to circulate water through it. The other...
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  2. J

    HW zone valve not closing after programmed time elapsed

    Hi, I'm looking for some advice regarding programming a time for hot water to come on and off. I set up my programmer for it to come on for 1 hour and it come on fine (zone valve opens bang on time). however, the zone valve does not close after time has elapsed. When I select hw off...
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  3. D

    2 port zone valve - 2 port motorised valve

    whats the differance, apart from price..?
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  4. E

    Does one plumb in a 2 port zone valve so that it can be removed easily in future?

    I've got a 2 port Sunvic 5203 5 wire zone valve with a very stiff spindle which has been installed 20+ years. I plan to drain the system down & cut it out and replace it with a Honeywell V4043H1056 zone valve. From reading the forum it seems that the Honeywell valve is the one to go for. What's...
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  5. B

    Spring return zone valve

    Can anyone help me and let me know why these valves need a permanent 230V supply? Many thanks
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  6. R

    Replacing Zone Valves

    Hi I am going to attempt to change the two leaking zone valves in my airing cupboard at the weekend. A couple of questions can I swap the existing Danfoss ones with Honeywell ones or are the valve bodys different? Is it pretty straightforward swapping them or a complete nightmare? Looks ok if I...
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  7. M

    Ideal C80FF / 95FF constantly on

    I have had a call from a customer telling me that their Ideal C80FF / 95FF boiler is constantly on heating. even though the dial on the boiler is on the off position!. Im going to look at it over the weekend and was wondering if anybody has come across this problem? Cheers
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  8. S

    Motorised valve

    every time i turn on just the hot water the radiators heat up as well someone said its the motorised valve is this true
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  9. Z

    2 Port Zone Valve question

    Hi all, I have been to look at a job today where a 2 port zone valve has packe up but it does work manually. Am i able to only to change just part of this zone vale without taking the body from the pipes? Also the main cable that comes from the valve is onlt about 20cm long and goes into a...
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  10. R

    Replacement synchron motor for Honeywell zone valve

    The motor on my Honeywell V4043 zone valve has stopped working so I need a replacement. Seems I can get a genuine Honeywell one for approx £25 or a pattern part off ebay for about £8. Has anyone here used a pattern replacement, and what is your opinion on how good they are? Money is tight at the...
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  11. E

    zone valve actuator motor

    anyone know of any instructions on how to change a motor? tried it a couple of times but failed. any suggestions would be appreciated!
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  12. S

    honeywell zone valves

    Hello I have checked for items on this forum for problems with honeywell valves but didnt find any that related to a problem I have. I am not a plumber I am a control systems qualified technician. The problem I have is both with honeywell whos support is very poor. In not returning phone calls...
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  13. J

    jambo

    just spent the last hour arguing with a developer about motorised valves at the moment he has a worcester 27cdi reg boiler tapped into a 90 ltr open vented cyl he reckons you cant have heating and hot water at the same time its either one or the other can some one clear this up so i can put him...
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  14. S

    Fitting 2 port Zone Valve

    Hi All I would like to put a 2-port zone valve on the upstairs branch of my heating system, controlled by a room stat in the bedroom. The reason for this is, the upstairs gets hotter a lot quicker than the down stairs, we’ve tried having the system balanced All rads have TRV’s except the...
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