What is a non return isolation valve?

Combination non return Isolating valve prevents the backflow of water from a water heater to the mains line. This serves the dual purpose of protecting the mains supply from contamination, and the loss of water that has already been heated.

What size is a standard isolation valve?

15mm Isolation Valve thread size.

How does a non return isolating valve work?

Non-return valves work by allowing media to flow through them in only one direction. These valves have two openings in the body, one for media to enter and the other for media to leave. Non-return valves work automatically, which means that most are not controlled by a person or an external control.

What size thread is a 15mm isolation valve?

Washing machine isolation valve / tap with 15mm compression pipe connection on one end, 3/4 inch male BSP thread on the other (standard thread size for washing machine inlet hoses). Used to isolate the water supply to washing machines, dishwashers and American Style fridge freezers.

Where do you place a non-return valve?

Where in the drain to install a Non Return Valve?

• End of Pipe. If you have a drainage pipe leading to a pond, stream or river, you may want a non return valve to go over the top of the pipe.
• New chamber outside your property.

Do isolation valves reduce flow?

If you are looking to fit isolation valves to outlets (not central heating), then: 1. If the outlet is on a high pressure (1 bar or greater) pressure, then you can probably get away with a normal isolation valve. The exception is for a bath filler or high volume shower, where a full bore valve would not reduce flow.

What size is nut on 15mm compression fitting?

The nut on a 15mm compression fitting is 24mm across the flats. The nut on a 22mm compression fitting is 32mm across the flats.

What size thread is on a 15mm compression fitting?

The threads on compression fittings are usually 1/2″ BSP and 3/4″ BSP (for the 15mm and 22mm fittings).

Do I need a non-return valve?

Non-return valves are used in systems where it is desirable to make sure fluids flow mostly in one direction, but may not be critical, for example in pumped systems such as heating circuits.

Which way do I turn my isolation valve?

“To turn it off you’ll need a flat head screwdriver, the slot on the isolation valve should be following the pipe work, that’s when the water is on, if you give it a quarter of a turn in either direction the slot should be going across the pipe work, that’s how you know the isolation valve is in the off position.”

When to use a non return and isolating valve?

The non return and isolating valve (NRI) provides two functions; an isolating and non-return function. The valve provides a non-return function if the upstream pressure is greater than the supply pressure, and the isolating function is used when servicing the water heater.

Where to find a NEFA 15mm brass female non return isolation valve?

Find Nefa 15mm DR Brass Female Non Return Isolation Valve at Bunnings. Visit your local store for the widest range of products. Javascript is required for this page Products Back Tools Back

When to use the non return valve on a water heater?

The valve provides a non-return function if the upstream pressure is greater than the supply pressure, and the isolating function is used when servicing the water heater. We will gladly assist with returns and exchanges of this product in accordance with our returns and exchanges policy Shop wherever you are, whenever you want.

Is it easy to install an isolation valve?

Isolation valves are normally easy to fit as the majority of them are compression or push fit, you can get valves that require soldering, but they are not as common and can be tricky to install without damaging the isolator. Isolation valves are useful, because you can service items without having to isolate the water to the whole property.