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Note: Code 1, Code 2 and Code 8 is used in the valve opening and closing, the need for the two power sources at the same time the valve is operated. 3.3.2 safety valve, valves, traps, hand wheel directly connected to the valve stem operating structure, this code is omitted, no representation. 3.3.3 valve for pneumatic or hydraulic mechanism operation: always open with a 6K, 7K representation; often closed with 6B, 7B representation; valve 3.3.4 explosion-proof electric apparatus represented by 9B; 3.4 connection type 3.4.1 connection type with Arabic numerals, specified in Table 4. 3.4.2 various specific forms of structural connections using standard or method (such as: sealing flange form and manner, welding form, thread form and standards, etc.), are not connected code plus symbols, should design the products, specification or contract and other documents in order to be described in detail. Table 4 valves connecting terminal connection type connection type connection type in the code thread one pair of clip 2 external thread clamp 7 8 9 flange welded sleeve 4 6 3.5 Valve Type Structure Code valve structure with Arabic numerals, press Table 5-15 provisions. Table 5 form the structure of the code in the form of valve stem lift structure code (rising stem) wedge gate resilient rigid gate single gate gate 0 1 2 parallel double plate gate-gate 3 single stem double plate 4 Non-lift (dark bar) wedge gate single gate 5 double plate 6 parallel-type double plate gate single gate 7 8 Table 6 valves, throttle valves and piston valve type structure code in the form of structure code structure 7 three-way valve in the form of a code-valve unbalanced balance through way through way 6 Z-shaped flow channel 2 Angle runner runner 3 - - Angle runner 4 - - DC runner 5 - - Table 7 ball valve structure code in the form of a floating structure code structure code in the form of ball through the flow channel 1 Fixed ball through 7 Y tee runner runner runner 6 L four-way tee runner 4 T tee runner 8 T tee runner 5 L-shaped three-way flow paths 9 - - hemisphere straight 0 Table 8 butterfly form structure code in the form of structural code in the form of single-eccentric seal structure code 0 5 unsealed single eccentric center of the vertical panel 1 center vertical board 6 pairs Eccentric two pairs of three eccentric eccentric 7 3 4 Three eccentric 8 Linkage Linkage 9. Table 9 diaphragm structure code in the form of code structure code in the form of structural ridge runner house 5 Y-shaped corner of Formula 1 through way of Flow 6 DC Road 8