Filled propane tank, no propane comes out

Newer tanks have a ruptured pipe valve in them. I went through three tanks, two regulators and a hose with our WeberQ before I learned this. Some are more sensitive than others. Now I just barely, barely crack the valve, watch the hose tighten up like a snake for about five seconds, and then open the valve fully. It's the sudden rush of gas through the hose as it pressurizes that sets the safety valve. If it's really quiet and you crack the valve too fast, you can hear the safety valve click closed. Once closed, you'll still have enough gas in the hose to run the grill at very low flame for a few minutes before it fizzles out. This really through me for a loop. I was ready to hurl the WeberQ in the bay. I'm glad I didn't. Now that I know, it runs great.