Structure features of vertical & horizontal quick opening closure: 1 There is no opposite rotating between sealing surface of closure and sealing ring; the whole system has better sealing effect; 2 Three-petal clamps reduce length of opening screw, which makes the switch more flexible; 3 The bearing capacity area of teeth is simultaneously enlarged; it is more suitable for the gas pipeline of high-pressure and large caliber; there is no welding part at main bearing position; 4 There is function of secure self-locking. Opening process of quick opening closure: 1 Open the air release valve and exhausting valve of the container where the closure is installed to reduce the pressure in the container to be zero; 2 Use the spanner to rotate the screw to enlarge internal diameter of three-petal clamps tightening ring; stop rotating screw when the internal diameter of tightening ring is larger than the external diameter of closure; and at this time the tightening ring separates from the closure seat and cover; 3 Pull the handle with hand and open the quick opening closure. Closing process of quick opening closure: 1 Cover the antirust grease (glycerol) after completely clean sealing surface, sealing groove and dirt in the pressing rings; 2 Close and push the closure tightly; 3 Use the spanner to rotate the screw anticlockwise; press the closure cover; 4 Install the safety interlock mechanism.