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I. Overview At present, China has two main valve drive connection standards, namely GB / T "multi-turn valve drive connection" and GB / T12223-2005 "part of the rotary valve drive connection", these two Items are approved on February 21 this year, the release date of implementation is August 1, 2005. The two standards adopted ISO 5210 and ISO 5211 standards respectively when they were first formulated in 1989. The new standard in 2005 was a revision of the original 1989 standard and the same revision adopted (equivalently) a new version of ISO5210 and ISO5211 . The two main provisions of the valve driving terms and definitions, flange code and its corresponding maximum torque, the flange size and the valve connected to the drive structure and dimensions. "Multi-turn valve drive connection" also provides the maximum thrust corresponding to it. "Multi-turn valve drive connection" is mainly applied to the gate valve, globe valve, throttle and diaphragm valve drive and valve connection dimensions. "Part of the rotary valve drive connection" is mainly applicable to ball valve, butterfly valve and plug valve drive and valve connection dimensions. The two standard connection sizes also apply to the drive and gearboxes, gearboxes and valves. Second, the "multi-turn valve drive connection," the main difference between the old and new standards 1, the new standard increased the F12 code flange, the new increase in the F12 code flange can pass the maximum torque value of 250N • m, thrust The value is 70kN. F12 flange size see table below: Flange Code d1 d2 (f8) d3 d4 hmax h1min Number of Bolts or Tap F12 150 85 125 M12 3 18 4 2. The new standard sets the requirements for the bolt hole location distribution, namely Standard In the "5.6 studs or bolt holes should be staggered drive axis symmetrical distribution .3, the new standard will be added to the original content of the standard Appendix A, the contents of the original standard appendix A1 (Figure) as a new standard" 6.1 can not only pass Torque and can withstand thrust drive "(including Figure 4); the contents of the original standard Appendix A2 (Figure) as the new standard" 6.2 torque-only drive "(including Figure 6) No appendix 4, the new standard also added the following terms: "3.5 flange code (the original standard in the connection dimension sheet of the note). 5.2 Driving device Flange connected with valve shall adopt flange with locating shoulder and its matching dimensions shall be in accordance with d2 in Table 2. 5.4 The minimum length of the thread connecting the valve to the drive is as specified in Table 2, h1. 5.5 flange flange size, according to Table 2 d1 (minimum). "In the above few, Figure 1 and Table 2 has clearly expressed the provisions of 5.2, 5.4, but not clear 5.5 d1 is the minimum." 5, the new standard adds "Table 1 flange code - the largest Torque and Maximum Thrust "Note 4 and Note 5:" NOTE: Changes in the calculated parameters above 4 will result in changes in drivable torque and thrust values. 5 Specific application, the flange code selection should take into account due to inertia or other similar factors in the stem generated on the additional torque. "The old standard only added the first three." Part of the rotary valve actuator The main difference between the new and old standard "1, the new standard adds the flange of the F60 code, the new added F60 flange can pass the maximum torque value of 250000N • m.F60 flange size see table below: Act Lan code d1 d2 (f8) d3 d4 hmax h1min number of bolts or threaded holes F60 M36 8 54 20 2, the old and new standards to transfer the maximum torque of the assumptions and narrative changes.The table of the new standard Note: Note 1: The torque values ​​specified in this table are based on: Bolted tension 290N / mm2, the friction coefficient between the flange surface is 0.2 and determined. 2: In the specific application, the choice of flange code should take into account the additional torque generated on the valve stem due to inertia or other similar factors. "The old standard table notes are:" NOTE: The torque in the table is derived from the following assumptions: a. The mechanical properties of bolts are 8.8 grades, the yield strength is 640N / mm2, the allowable stress is 20N / mm2; b. The bolts only bear the tension, not considering the additional stress caused when tightening the bolts; c. The coefficient of friction is 0.3. "3, The new standard adds the entire contents of Chapter 4," Connection Type Representation. "4. According to the new flange standards and international standards, the new standard F03 and F04 flange size is different from the old standard, as shown in the following table : Flange code d1 d2 (f8) d3 d4 hmax h1min Number of bolts or holes F03 46 25 36 M5 (M6) 3 (2) 8 (9) 4 F04 54 30 42 M5 (M6) 3 (2) 8 ) 4 The brackets in the table for the original standard size 5, the new standard clear bolt hole location distribution requirements, an increase of Figure 2 and Table 3 (Figure with the above chart the same figure.) 6, the new standard adds the following terms: 3.4 flange code (the original standard in the connection dimension sheet in the note). 6.2 Driving device Flange connected with valve shall adopt flange with locating shoulder and its matching dimensions shall be in accordance with d2 in Table 2. 6.4 The minimum length of the thread connecting the valve to the drive is as specified in Table 2, h1. 6.5 Flange outer dimensions, according to the d1 of Table 2 (minimum). "In the above, Figure 1 and Table 2 has clearly expressed the provisions of 6.2, 6.4, but not clear 6.5 d1 is the minimum value 7. The new standard is more detailed in Chapter "Dimensions of Drives" New Standards: Chapter 6 "Dimensions of Drives" New Standard: Chapter 7 "Dimensions and Transmission Torques of Drives" and Chapter 8, "Position of Driven Parts." New Standard: Chapter 7 "Dimensions and Transferred Torque of Drives" is divided into three sections: 7.2 Drives with keyed connections (Table 4 Dimensions of keyed drives and Transmission torque) 7.3 Parallel or diagonal square drive (Table 5 Parallel square or diagonal drive size and transmission torque.) 7.4 Flat head drive (Table 6 Flat head drive size and transmission Torque) .Three of the three detailed description of the three forms of drive and the size of the transmission torque, and the notes in the table selected the preferred size of the driver and the driver can determine the maximum torque can be transmitted. Device and valve connection example "the original standard in the appendix The new standard without appendix, the content of the old standard appendix in the text, cancel the connection example figure. Four, the new standard and ISO standard main differences 1, the standard structure and writing rules in accordance with GB / T1.1- 2000; 2, the scope of the standard GB / T use text description, ISO 5210: 1991 with graphics and text together to describe; 3, GB / T standard does not comment on the flange code, ISO 5210 : 1991 Chapter 6 of the flange code was annotated; 4, according to China's cartographic standards, the standard appears in the figure was redrawn; 5, for ease of use, combined with China's national conditions, the text made editorial changes. Fifth, the use should pay attention to the problem As GB / T revised basis is ISO 5210: 1991 version, and GB / T revised basis is ISO 5211: 2001 version, so the terms and comments are different , Of which the main points are as follows: The two standard "Table 1 flange code - the maximum torque value" part of the comments are quite different. GB / T narrated as: 1. Bolt mechanics The performance rating is 8.8, the yield strength is 628 N / mm2, the allowable stress is 200 N / mm2. 2. The bolt only bear the tension, not considering the additional stress caused when the bolt is tightened. 3. The friction coefficient : 0.3 GB / T is described as follows: The value of the torque specified in this table is based on: bolt tension is 290N / mm2, the coefficient of friction between the flange surface is 0.2 and determined. Calculated by the two conditions, the result is the same. I think GB / T set the conditions more reasonable.