Cylinder valve is an important source of gas cylinders switching components, its structured in two ways. One is connected with the valve at the external thread, thread size W21.8mm × 1 / 14 of inch thread connector. The other one is connected with the valve at the internal thread, thread of M22 × 1.5 or G5 / 8 "(14 teeth / inch) connector, commonly used at present for G5 / 8" (14 teeth / inch) thread, valve on the bottle had been marked the first such structure, set up high-pressure cylinder valve security patch, when the gas pressure inside the cylinder pressure of about 25% over rated, the security protection film will explode, the gas pressure relief quickly.