Check valve. Do I need one?
- Thread starter ray99
- Start date
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Anyone please?
Cold comes from the mains and hot from the tank. Tap is listed as single lever monobloc basin mixer. Item can be seen here:
http://www.bathroomcity.co.uk/wishlist.asp?action=add&cid=4538
Cold comes from the mains and hot from the tank. Tap is listed as single lever monobloc basin mixer. Item can be seen here:
http://www.bathroomcity.co.uk/wishlist.asp?action=add&cid=4538
C
cumbriahandyman
No.
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Your link does not give much of any detail on the tap unit that is to be fitted.
IF the tap is of the type that allows the water to mix within the body of the tap, and most usually are, then check valves will be required on both the hot and cold where the supplies are of un-equal pressure.
ultimately you should refer to the manufacturers details to check the type.
IF the tap is of the type that allows the water to mix within the body of the tap, and most usually are, then check valves will be required on both the hot and cold where the supplies are of un-equal pressure.
ultimately you should refer to the manufacturers details to check the type.
Can't find any info on the tap which appears to be unbranded. Unmarked box with no details inside. Have taken the end off the tap and it looks like the water mixes in the body. Have connected the pipes to the tap and I can blow and suck through both easily so no valves fitted internally.
You certainly don't need a check valve on the dhw. The air gap in the dhw header gives more than adequate protection to the cold main for this. additionally the flow rate at the tap will be signinficantly reduced by the resistance of the check valve.
Your hot water represents a fluid category two risk, which means that strictly speaking the cold main should be protected by a suitable fitting which a single check valve represents.
In practice I know of very very few plumbers/housebuilders etc who ever fit them.
Your choice really.
Your hot water represents a fluid category two risk, which means that strictly speaking the cold main should be protected by a suitable fitting which a single check valve represents.
In practice I know of very very few plumbers/housebuilders etc who ever fit them.
Your choice really.
The air gap is irrelevant when the hot and cold main supply is mixed within the body of tap!
Agreed ref the reduced flow hence suggestion re routing supply to provide balanced flows thereby eliminating need for check valves.
A check valve on the hot wouldn't be for backflow prevention, it's to stop mains pressure water going through the tap and up the hot supply into storage cistern causing overflow to run.
A flap type nrv will give hardly any restriction to flow.
A flap type nrv will give hardly any restriction to flow.
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