Vaccume Breaker Valve for Big Siphon Pipe .

Description :-

The Spring Loaded Vacuum Breaker Valve is a normally closed full bore vacuum breaker which is designed to open fully to allow the intake of air into the pipeline or system when vacuum conditions occur, thus protecting the pipeline. Negative pressure (vacuum) conditions are caused by sudden shutoff of the pumps, pipe ruptures or the rapid draining of the pipeline. The Valve can be installed both on potable water lines and on wastewater lines.

Applications -

Pump stations. -

Water transmission lines.

Operation :-

The valve is normally closed. The valve is designed to prevent vacuum conditions from occurring in pipelines and piping systems. After a power failure at the pump or a rapid draining of the pipeline, vacuum occurs. If the pressure differential across the orifice is greater than -0.02 bar, the disc will automatically start to open, allowing air into the pipeline to eliminate negative pressure. At -0.05 bar, the orifice will be fully open, allowing for maximum air intake. When the system returns to positive pressure, the disc will automatically close to tightly seal the valve. The Vacuum Breaker & Air/Vacuum, Automatic Air Release Valve operates similar to the Vacuum Breaker with the addition of three other functions:

1- The air/vacuum component of the AV will discharge air, essential during pipe filling.

2- The vacuum breaker, installed at points where water column separation is anticipated, will open to intake air, then, close quickly to trap the air in the pipeline.The air/vacuum component of the air valve will slowly discharge this trapped air ahead of the returning water column. This will allow the air in the pipeline to act as a buffer against pressure surges and will also, by slowing down the air discharge, slow down the returning water column, prevent upsurges in the pipeline.

3- The air release component will release air continuously while the pipeline is operating under pressure, removing entrapped air from the line.

Installation :-

The Valve  Disc-Type Spring-Loaded Vacuum Breaker should be installed on water transmission lines at the points where it is determined that vacuum or water column separation will occur.

Siphons are pipes that are buried across the gully. They traverse down to the lowest point of the gully and then come up at the other side (hence the name inverted siphon). As long as there is sufficient head and the pipe is below the hydraulic grade line, the flow can be conveyed through such siphons. A flush out valve must be incorporated at the low point of the siphon (since sediment can be deposited at the low point). Such siphons can also reduce costs of crossings as well as risks due possible damages from floods. Sufficient protection against scour and damages due to rolling boulders should be provided for inverted siphons. This can be achieved by encasing the pipe in concrete (generally nominally reinforced) along with stone pitching on the top of the pipe

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