Valve

Yes, you need to get a new one.. I usually change mine every 2-3 months when I realize that the suction is not strong. I buy the valves online from Pupsik.

without the valve there won't be any suction, broken part also will cause of low/no suction power, you can buy it at shopee

Yes. You will required to get a new one

U need to get spare tubing and valve.

You need to change valve once torn

Yes need to get replacement

You need to get a new valve

Yes :/

Mayb

Yes