1/2" Press X FIP Dielectric Union Lead Free 301-103PNL MPN: 301-103PNL Part#: 441995 Min. Order Qty: 1 Price: Call for Price

Only licensed plumbers with backflow prevention accreditation issued by a registered training organisation (backflow plumbers) can inspect, commission and test backflow devices. With that said, Crown Plumbing Specialists are accredited in backflow prevention and works with Sydney Water to ensure compliance.

In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened). Reduced pressure in the pipe may allow contaminated water from the soil, from storage, or from other sources to be drawn up into the system.

Backflow means the undesirable reversal of flow of a liquid, gas, or suspended solid into the potable water supply. In other words, its a term in plumbing for an unwanted flow of water in the reverse direction. A backflow preventer is designed to keep this from happening. Points at which a potable water system connects with a non-potable water system are called cross connections. Such connections occur naturally in appliances such as clothes washers and dishwashers, but they must be carefully designed and installed to prevent backflow. Another common location for a backflow preventer is the connection of a fire sprinkler system to a water main, to prevent pressurized water from flowing from the fire suppression system into the public water supply.

007M2QT Dispositif anti-refoulement double clapet antiretour 1-1/4po FNPT Bronze avec valve à bille quart de tour. Code du manufacturier: 62681. Marque: Watts.

In many countries. approved backflow prevention assemblies are required by law, and must be installed in accordance with plumbing or building codes.A typical backflow assembly has test cocks and shut-off valves, and must be tested when installed, if relocated or repaired, and also on a periodic basis

Find helpful customer reviews and review ratings for WATTS N45B M1 WATER PRESSURE REDUCING VALVE at Amazon.com. Read honest and unbiased product reviews ...

At our one-stop-shop logistics enterprise, our mission is to be the ultimate logistics partner for our customers. We are committed to delivering unparalleled ...

To prevent contamination due to back pressure, many health regulatory regimes require an air gap or mechanical backflow prevention assembly between the delivery point of mains water and local storage or use. Where submerged mains inflow is permitted,a backflow prevention assembly is required, which protects the potable water system from contamination hazards. A check valve is a basic form of backflow prevention, but often more complex devices are required because check valves are not considered to be reliable, when compared to more sophisticated devices with redundancies and reduced-pressure zones.

A closely related device is the backwater valve, which is designed to prevent sewage from backing up into a building and causing basement flooding.

Zurn's water pressure regulator valve is ideal for residential & commercial applications. Check out our complete line of pressure vacuum breaker.

The simplest, most reliable way to provide backflow prevention is to provide an air gap. An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool. A simple air gap has no moving parts, other than flowing water. Other preventive devices include but not limited to

4 — Overview, Why Invest, Stock Info, Stock Quote, Stock Chart, Historical Stock Quote, Dividend History, Analyst Coverage, Financials, Quarterly Results, Annual ...

Back pressure can force an undesirable contaminant to enter potable water piping. Sources of back pressure may be boilers, heat exchanging equipment, power washing equipment, fire sprinklers, or pumps in the water distribution system. In some cases there may be an almost continuous risk of overcoming the static water pressure in the piping. To reduce the risk of contamination, a backflow preventer can be fitted. A backflow preventer is also important when potentially toxic chemicals are used, for instance for commercial/industrial descaling of boilers, or when chemical bleaches are used for residential power washing.

Back-siphonage occurs when higher pressure fluids, gases, or suspended solids move to an area of lower pressure fluids. For example, when a drinking straw is used to consume a beverage, suction reduces the pressure of fluid inside the straw, causing liquid to move from the cup to inside the straw and then into the drinker’s mouth. This is an example of an indirect cross-connection, undesirable material being pulled into the system.

The AVB is used in many plumping installation and incorporated into the plumbing fixtures such as sink faucets. The AVB is designed for low flow installations such as laboratory equipment janitor’s utility sinks, dishwashers, hair washing station sinks and other application that use small amounts of water. The AVB is an end-user backflow prevention device a designed for the isolation of a cross-connection within the plumbing system. The AVB cannot be used on service line for containment protection since it is not designed for backpressure conditions. Although the AVB cannot be tested in-line, it should be inspected periodically. This can be done by opening and closing the upstream shut-off valve and listening for the float disc or poppet to drop down. An internal inspection can be made by removing the canopy or cover and inspecting the float disc to determine if it is moving freely and there is no damage to the sea disc or other internal parts. The inspection of the AVB should include an observation of the AVB air inlet port to ascertain that no rage, towel or other material is impeding the flow of air into the air inlet port. Atmospheric vacuum breakers can only be used on an open-head sprinkler system and where the sprinkler system is not in continuous use for more than 12 continuous hours.

Close outlet ball valve then close inlet ball valve. Bleed residual pres ... FEBCOonline.ca. IOM-F-765 0823. © FEBCO, 2008.

Back-pressure occurs for example when air is blown through the straw and bubbles begin to erupt at the submerged end. If instead of air, natural gas had been forced into a potable water tank, the gas in turn could be carried to a kitchen faucet. This is an example of a direct cross-connection, with undesirable material being pushed into the system.

Plumber and Plumber Trainees · 24 hours of continuing education · 8 hours of continuing education prior to annual license renewal · 4 additional hours Plumbing ...

The precise measures required to prevent backflow depend on the risk of contamination, i.e. the condition of the water in the connected system. This is categorized into different risk levels:

A plastic quick connect fitting is a durable fitting that is ideal for use in water applications. They are easy to install, removable and reusable.

Robust pressure reducing valves that safely control water pressure and flow in domestic, industrial and commercial buildings.