How to correctly open and close the household heating valve?
🔧  The method of opening and closing the heating valve is actually very simple. Let me explain it in detail below:
one ️⃣  Operate according to the markings on the valve: open - open; Close - Close. This method is applicable to most heating valves.
two ️⃣  If your home's heating valve is a ball valve, then when the handle and pipeline are in a straight line, the valve is in the open state; When the handle and pipeline are at a 90 degree angle, the valve is in the closed state.
three ️⃣  Some heating valves are operated in a handwheel style, where you need to turn left to close the valve and right to open it.
four ️⃣  If the valve is already open but some radiators are not hot, it may be because there is air in the radiator pipes or inside the radiators. At this point, you can open the exhaust valve on the radiator to release the air, and the problem can usually be solved.