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Sizing pipe and valves and calculating system pressure requirements(2)
Source:rember chen | Author:cynthia | Publish time: 2017-10-10 | 1267 Views | Share:
Now that we have sized these laterals, let’s have a look at the piping plan for this entire sample system.

The main line has not yet been sized, nor has a component on the line just after the water meter — the backflow preventer. Backflow is the unwanted reverse flow of water in a piping system. A backflow preventer, of which there are several types, is a valve or valve assembly that physically blocks the potentially contaminated water in the irrigation system from flowing back into the domestic water supply.
This backflow prevention device, along with all the pipe and electric valves on the system, will need to be sized.

A few guidelines to assist you in sizing valves are listed below.

The flow through the valve should not produce a loss greater than 10% of the static pressure available in the main line.
The valve should either be the same size as the largest pipe in the lateral it serves, or no more than one nominal size smaller than that pipe.
The valve should not be larger than the pipes in the lateral, unless a high flow (equivalent to a larger size pipe) results from a split lateral.

One caution about over-sizing automatic valves:

Occasionally, dealing with low pressures to begin with, will look for ways to reduce pressure loss. If the designer selects a large size valve because the flow loss is so low as to be unlisted on the performance chart, he or she may find the valve won't operate once the system is installed. There must be a minimum pressure loss through most types of automatic valves! The valves use this pressure differential to open and close. Lack of data in the manufacturer's performance chart is an indicator that the valve should not be used at the high or low flows in question.