1, the subject content and scope This standard specifies the
Fire Ball valve product classification, technical requirements, test methods, inspection rules, signs, packaging, transportation, storage. This standard applies to the transmission of water, foam and other liquid mixture of liquid fire extinguishing agent, medium temperature is -40 ~ +70 ℃ fire ball valve. This standard does not apply to the fire gas valve fire-fighting agent. 2, the standard reference GB 3181 paint film color standard sample size GB 3452.1 O-ring for hydraulic and pneumatic seals and tolerances GB 12220 common valve mark GB 12223 part rotary valve actuator GB 12225 common valve copper alloy casting technical conditions GB 12226 Common valve gray cast iron technical conditions GB 12227 General valve ductile iron technical conditions GB / T 12252 General valve supply requirements JB / Z 246 Ball valve static pressure life test procedures 3 Product Categories 3.1 Structure 3.1.1 Fire Ball Valve seal by its sphere Forms are divided into: a. One-way seal; b. Two-way seal. 3.1.2 fire ball valve according to its connection with the pipeline is divided into: a. Two flanges; b. Two-threaded; c. One end of the flange, one end of the thread. 3.2 Specifications Fire ball valve specifications shall comply with the provisions of Table 1, special specifications according to contract requirements. Table a nominal diameter mm
