Sweet "pressurized" p/s tank

[gadirtracer]

Why or when would you need a "pressurized" power steering tank? Got one on a new car that is made by Sweet, has a scrader valve, over flow tube, and a radiator cap. Does one need to add pressure to the tank prior to starting the engine the first time? If so, how much?

[gadirtracer]

https://sweetmfg.biz/product.php?productid=2362

[BTDT]

You do not have to pressurize it before starting but do before racing. The "head" pressure on the system keeps the fluid from foaming. I would also check it every week.

Been done on aircraft hydraulic systems for over 30 years.