The dark-rod wedge-type cast iron valve handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited. 5), the gate valve with the transmission mechanism, installed according to the provisions of the product manual. 6. Execution standard 1), product standard "General valve flange connection iron gate valve" GB/T 12232-2005 "General requirements for steel valves" GB/T 12224-2005 "Steel slab gate valve for pipeline" JB/T 5298 -91 "Inspection and Test of Valves" JB/T 9092-1999 "Safety Evaluation Standards for Drinking Water Distribution Equipment and Protective Materials" GB/T 17219-1998 2), Engineering Standards "Building Water Supply and Drainage and Heating Engineering" Construction Quality Acceptance Specification GB 50242-2002 "Code for Construction Quality Acceptance of Ventilation and Air Conditioning Engineering" GB50243-2002
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