What is a suitable sol valve to put in a 0.25 in Cu pipe to shut off water

 

A suitable solenoid valve for a 0.25 inch copper pipe to shut off water would be a 0.25 inch brass or plastic solenoid valve with a pressure rating suitable for your system and a compatible voltage for your power source. Some factors to consider when selecting a solenoid valve include the maximum operating pressure and temperature of your system, the material of the valve body, and the type of fluid being controlled.

There are a variety of solenoid valves available on the market, including normally closed (NC) and normally open (NO) valves, direct acting and pilot operated valves, and 2-way and 3-way valves. The specific type of valve you need will depend on the requirements of your system, so it may be best to consult with a plumbing or water treatment professional to determine the best valve for your application.

ChatGPT answer?

 

OK, to even try to suggest the correct valve to an application, which we do not know, a fair amount of information will be needed. Start with the required flow rate and the system pressure. Then for the valve operation: will it be open or closed with the power off? And when the valve is powered, will that be for extended periods of time? or only momentary?
The liquid is tap water, will it be hot or not? Will this valve be in a protected location or external to whatever it is supplying?
And will the coil power be AC or DC, and what voltage? Unless the conditions will be rather brutal, a plastic body valve will be much less likely to suffer corrosion and mineral build up. Metal fittings to screw in and connect to the copper tubing will be entirely appropriate. The required flow rate will determine the effective port size, if your supplier has a selection of sizes.

Valve sizing was one of the less-fun parts of designing machines at one job. Yes, the EE had to do that as well as it was part of the controls.