Hi, First post, and this stuff is way above my head so i am hoping some one can help me. So what I am after, i am after building a solenoid to to open a valve, this valve is holding back around 3000psi compressed air. its from a pressure washer gun. and takes quiet abit of force to open it. I have 28swg enameled copper wire but limited knowledge on how to make this. The tube i have is pvc 10mm 1.2mm wall thickness and a piece of iron to fit inside. What i have no idea about is the following, i want to achieve maximum force available so i wish to know my best set up i,e winds length capacitor i have a lipo battery to that will fit into the enclosure its a 11.1v 25c 1500mah. Please any info would be appreciated.