What is the use of reflux valve?

A reflux valve is designed to prevent the water and sewerage from flowing back into the private property drain when the sewer main or on-site treatment plant becomes inundated during a flood event.

Is check valve and non return valve same?

Check valves stop the flow of fluid in one direction and allow free flow in the opposite direction. They are also known as non-return valves. Most check valves are spring-loaded and use a ball or plate to seal the flow in one direction.

What are the three different types of check valves?

Check valves are unidirectional valves that provide unobstructed flow in one direction as long as flow pressure remains constant and protect the piping system against reverse flow. The three main types of check valves we offer are ball, piston, and stop check valves.

What is check valve used for?

When pressure changes in the piping cause flow reversal, check valves protect pumps and other equipment from damage caused by backflow. They are used in a wide variety of applications for flow control including, line isolation, priming pumps, media injection, maintaining head pressure, and many others.

How does a reflux valve work?

How does a reflux valve work? The valve remains open for forward flow. The valve pushes shut with even the slightest hint of backward flow. This ensures no contaminated water and raw sewage flows into your hobless shower recess.

Where should check valves be installed?

Check valves are used in many different applications. For example they are often placed on the outlet side of a pump, to protect the pump from backflow. Centrifugal pumps, the most common type of water pumps, are not self-priming, and therefore check valves are essential for keeping water in the pipes.

Where do you put a reflux valve?

Reflux valves are installed in the property sanitary drain, usually at properties that do not have an overflow relief gully (ORG) installed, however some properties may have both. A reflux valve may also be required for a property in a flood zone.

How does a reflux valve or check valve work?

The valve stops/check the flow in reverse direction. It is operated by pressure alone, having no external means of control. The flow of water is controlled by means of a disc rising and falling onto a seat with the pressure (lift check). The return of the disc may sometimes be aided by a spring (spring-loaded check).

What’s the difference between a non return valve and a check valve?

Non-Return Valves, NRV’s, Reflux Valves and Check Valves all have a common functionality but are known by a variety of terminology. A Non-Return Valve is specifically designed to prevent the back flow or reverse flow of a liquid or gaseous media and to protect the pump from the damaging surge pressures of water hammer following pump shut-down.

Why is a reflux valve called a NRV?

Reflux valve is commonly known as Check valve and Non Return Valve (NRV). Water tends to flow from higher pressure to lower pressure. Mains pressure is kept higher to suffice water distribution in a house. Sometimes mains pressure is reduced due to need of water in fire fighting.

Which is the correct description of a check valve?

A swing check valve or tilting disc check valve is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle.

What are check valves and what is the use of a check valve?

A swing check valve is a valve that uses a disc to block the flow, it is the movable part that swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. Mostly large check valves are swing check valves. The swing check valve has a flap or disk that hangs down in the flow path.