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check valve
A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, and inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.
An important concept in check valves is the cracking pressure which is the minimum differential upstream pressure between inlet and outlet at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
Water Heater Screaming Sound on Cold Water Line Spring Check Valve
Have this water heater for around 1 year, and it started doing this some time ago.
Any suggestions on how to fix this?
I just had installed a Navien NPE-2 with built in recirculator pump. I have a dedicated return line. The check valve for the recirc is built into the unit; a spring check valve was placed on the cold line (per the manual) after which there is an expansion tank (on the cold line) in a T junction...
Rogelio
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Does anyone know where I can get a DCV with an isolator that is WRAS approved?
I need one for an outside tap and have limited space so I could do with a combined item
thank you :)
I’ve noticed on my old Bosch boiler the DCV on the filling loop is fitted to the boiler side of the water supply.
And there is no isolator valve fitted. The only thing stopping it from leaking is the DCV?
IS this ok?
Hi.. Flat upstairs had a leak over Christmas - They were on holiday and some damage was caused to my flat. The tenants above explained that the leak came from the valve below the main water supply handle, and that a plumber came only a month beforehand to fix this part, that then leaked again...
Please see the RED marked area; The Hot water service (HWS) rretun line having a Check valve what is the purpose of this valve here? also i can see a TEE in the HWS forward and Return line, it's the only thing will be available in the HWS F&R joint?
What i have understood is the HWS F&R...
Can anyone tell me what the nut is for on the side of the double check valve in the pipe leading to my outside tap? The valve is jammed closed and I wondered if it is possible to free it?
Am going to install a check valve in mains supply, as using a ball valve and not a stopcock. Will be 22mm brass as long as WRAS approved is that all I should be looking for? Do any have bigger internal bores than others or are they all around 15mm internal? Oh and also single or double.
Hi everyone, I am looking for advice as under my kitchen sink their are two pipes, the cold water feed and hot water feed, the hot water feed has a check valve/NRV fitted on the copper pipe (I am not sure which kind of valve it is but it has an arrow on it) but the cold water feed pipe doesn't...
Hi,
in what circumstances, would you say, it is ok to install a boiler without a filling loop and/or check valve?
We had a new boiler installed without a filling loop and/or check valve. I had conflicting advice on the subject: some say it is illegal not to have a check valve (risk of water...
Hi all,
I have two questions that I'm looking for advice on please?
1. I've been asked to fit a double check valve on a new incoming main. I only did my water regs last year and this wasn't stipulated in the reg's? Has this now changed or did miss something? The property in Cheshire. The main's...
Hi guys
Should the check valve be after pressure reducing valve and before expansion vessel
Picture shows existing pipework with check valve before pressure reducing
Hi
I'm buying a new kitchen mixer tap, and I've found two with the exact same specs, brand and price, other than one having a 'ceramic cartridge' and the other having a 'check valve'.
What's the difference between the two, and which would be preferable?
Thanks for any replies
Can this double check valve be attached to a plastic water pipe, or can it only be attached to a copper water pipe? Thanks.
http://www.pegleryorkshire.co.uk/EN/Brands/Kuterlite/Valves/reordered_ChromePlateValves/product/K4424CP_Double_check_valve
I have a drinking water fountain to fit, Is a double check valve needed on the supply? Also are they usually piped up in the small bore plastic I have seen them fit with before presuming this comes with it?
hi all, i have recently had a new combi boiler fitted and since then i am plagued with water hammer. i have researched this and some fitters are saying it could possibly be caused by the stop cocks i fitted to isolate various parts of the house and extension. i have read that fitting check...
Hi All
What are the two screws marked HP and LP on both sides of the rough valve and also whats the significance of the HP and LP. Are they "check valves" if so what is their function?
The problem I am having is water hammer when the thermostatic shower comes on. Any ideas ?
Thanks in advance...
The outside tap at the back of the house has stopped working. Only a trickle of water emerges.
However I can force water back from the tap to the kitchen at the front of the house (and where the water main arrives).
I understand that this should not be possible because there should be a double...
rpettipher
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If fitting and outside tape with an internal double check valve, as water regs states. Do you then just fit a normal outside tap or still one with a built in double check?
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