is 150 psi this is limited by the valve that we chose to use since pressure higher than 150 psi could damage our valve we designed our tank around that pressure the aluminum that the tank is made out of is 6063 t6 aluminum with yield strength of 31 000 psi the 3 inch schedule 10 pipe has an outside diameter of 3 5 inches and a wall thickness of 0 12 inches to regulate the air pressure in our pneumatic system we use a series of three regulators we needed to use three because the air coming out of our tank is at 450 psi this is too high for conventional regulator like those found on an air compressor that is why the first regulator in our system is a meant for use on a paintball gun it is able to handle input pressures of up to 850 psi while being able to output anything below that our design calls for an input or 450 psi and an output of 150 after the paintball regulator we split the system into two separate regulators these regulators have maximum inputs of 150 psi with these two separate regulators we can adjust the air pressure going to the pneumatic actuator and the low pressure tank separately this allows us to change the distance we shoot a t shirt and still have the machine actuate properly to control the air cylinder that actuates the magazine we use a 4 way solenoid valve 137 the purpose of the solenoid valve is to direct the air to the two different chambers in the air cylinder 138 that makes our magazine rotate in one example embodiment the solenoid is a numatics brand solenoid valve that uses a 24 volt dc solenoid to.