When selecting the right size of brass check valve for your plumbing system, there are a few factors you should consider:
Flow rate: The flow rate of the plumbing system will help determine the size of the check valve needed. You will want to choose a valve that is capable of handling the maximum flow rate of your plumbing system.
Pipe size: The size of the check valve should match the size of the pipe it is being installed on. Using a valve that is too small for the pipe can cause excessive pressure drop and flow restriction, while using a valve that is too large can result in excessive weight and cost.
System pressure: The maximum system pressure must be taken into consideration when selecting a check valve. Choosing a valve that is rated for a lower pressure than what is present in your system can result in valve failure or damage.
Application: The application of the check valve should also be considered. For example, if the valve is being used in a sewage system, it should be resistant to corrosion and chemical attack.
Once you have taken these factors into account, you can consult with a plumbing expert or manufacturer to help you choose the right size and type of brass check valve for your specific plumbing system.