First: the valve handwheel diameters and the force is limited, and some saw the small wheel diameter 300 when three or four people to operate it is easy to damage, so we must pay attention to the valve handwheel diameters less than 320mm is when one person operation.
Second: the valve handwheel in normal status, status of the status of the hand wheel can also be our valves are the same, valve handwheel operation should be clockwise close counterclockwise should be open.
Third: the valve handwheel made of size are leveraged, so sometimes we borrow some of the attacks to open and close valves, most important thing is to observe our rules. Best smooth in order not to damage the valve seals.
