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The fire extinguishing ball device is composed of a foam shell, a dry powder driving device and an ABC dry powder fire extinguishing agent. The external part of the fire extinguishing ball device is wound with a cross-shaped lead. When the external lead wire is ignited, the driving medium is activat

Ball valveBall valves are evolved from plug valves. It has the same 90° rotation action, except that the plug body is a sphere with a circular through hole or passage through its axis. The ratio of the spherical surface to the passage opening should be such that when the ball is rotated by 90°, all

Introduction:The helium gas cylinder belongs to the national standard non-refillable steel cylinder and is designed and manufactured according to the national standard GB17268-1998. It is manufactured by the production line of ISO9001-2000 quality system certification by the General Administration o