标准规定了卡套式管接头的材料、压力-温度要求、标记方法、被连接管要求、扳拧尺寸与公差、结构与制造、性能和试验要求、安装说明、采购信息、标志等技术要求。
本标准适用于管子外径为4mm~42mm、最大工作压力为10~63MPa的液压流体传动和一般用途的管路系统。
注:在新设计的液压流体动力系统中,应采用F型螺纹柱端。
5.1 符合卡套式管接头标准的碳钢管接头,在介质温度为-40℃~+120℃范围使用时,应能承受表1和表2规定的工作压力,不同工作压力下24°锥密封焊接接管的壁厚应符合表3的规定。
5.2 除非另有规定,对于带弹性密封件的管接头,用于石油基液压油系统时应给与特别的工作温度范围,其工作温度范围可能缩小,也可能完全不适用于其他流体。制造商可提供适用于不同介质能满足温度范围要求的弹性密封件。
5.3 根据不同的压力等级和使用条件,将卡套式管接头分为以下三个系列:
——LL:超轻载系列;
——L:轻载系列;
——S:重载系列。
表1 用于液压流体动力与一般用途卡套式管接头的工作压力
系列 | 管子外径 mm | 卡套连接与锥体连接 | F型螺纹柱端 | ||
普通螺纹 | 最大工作压力a MPab | 普通螺纹 | 最大工作压力 MPa | ||
LL | 4 | M8×1 | 10 | / | / |
5 | M10×1 | 10 | / | / | |
6 | M10×1 | 10 | / | / | |
8 | M12×1 | 10 | / | / | |
L | 6 | M12×1.5 | 25 | M10×1 | 25 |
8 | M14×1.5 | 25 | M12×1.5 | 25 | |
10 | M16×1.5 | 25 | M14×1.5 | 25 | |
12 | M18×1.5 | 25 | M16×1.5 | 25 | |
(14) | M20×1.5 | 25 | M18×1.5 | 25 | |
15 | M22×1.5 | 25 | M18×1.5 | 25 | |
(16) | M24×1.5 | 25 | M20×1.5 | 25 | |
18 | M26×1.5 | 16 | M22×1.5 | 16 | |
22 | M30×2 | 16 | M27×2 | 16 | |
28 | M36×2 | 10 | M33×2 | 10 | |
35 | M45×2 | 10 | M42×2 | 10 | |
42 | M52×2 | 10 | M48×2 | 10 | |
S | 6 | M14×1.5 | 63 | M12×1.5 | 63 |
8 | M16×1.5 | 63 | M14×1.5 | 63 | |
10 | M18×1.5 | 63 | M16×1.5 | 63 | |
12 | M20×1.5 | 63 | M18×1.5 | 63 | |
(14) | M22×1.5 | 63 | M20×1.5 | 63 | |
16 | M24×1.5 | 40 | M22×1.5 | 40 | |
20 | M30×2 | 40 | M27×2 | 40 | |
25 | M36×2 | 40 | M33×2 | 40 | |
30 | M42×2 | 25 | M42×2 | 25 | |
38 | M52×2 | 25 | M48×2 | 25 | |
注1:F型螺纹柱端按附录A。 注2:对于更高压力和动态应用,应咨询制造商。 注3:尽可能不采用括号内的规格。 | |||||
a 设计系数:4:1。 b 1MPa=10bar=106N/m2=106Pa。 |
表2 用于一般用途卡套式管接头的工作压力
系列 | 管子 外径 mm | 卡套连接与 锥体连接 | E型螺纹柱端 | B型螺纹柱端 | A型螺纹柱端 | 锥螺纹柱端 | |||||||
普通螺纹 | 最大 工作 压力a MPab | 普通螺纹 | 最大 工作 压力a MPab | 普通螺纹 | 最大 工作 压力a MPab | 普通螺纹 | 55° 非密封管螺纹 | 最大 工作 压力a MPab | 55° 密封管螺纹 | 60° 密封管螺纹 | 最大 工作 压力a MPab | ||
LL | 4 | M8×1 | 10 | / | / | M8×1 | 10 | M8×1 | G1/8 | 10 | R1/8 | NPT1/8 | 10 |
5 | M10×1 | 10 | / | / | M8×1 | 10 | M8×1 | G1/8 | 10 | R1/8 | NPT1/8 | 10 | |
6 | M10×1 | 10 | / | / | M10×1 | 10 | M10×1 | G1/8 | 10 | R1/8 | NPT1/8 | 10 | |
8 | M12×1 | 10 | / | / | M10×1 | 10 | M10×1 | G1/8 | 10 | R1/8 | NPT1/8 | 10 | |
L | 6 | M12×1.5 | 25 | M10×1 | 25 | M10×1 | 25 | M10×1 | G1/8 | 25 | R1/8 | NPT1/8 | 25 |
8 | M14×1.5 | 25 | M12×1.5 | 25 | M12×1.5 | 25 | M12×1.5 | G1/4 | 25 | R1/4 | NPT1/4 | 25 | |
10 | M16×1.5 | 25 | M14×1.5 | 25 | M14×1.5 | 25 | M14×1.5 | G1/4 | 25 | R1/4 | NPT1/4 | 25 | |
12 | M18×1.5 | 25 | M16×1.5 | 25 | M16×1.5 | 25 | M16×1.5 | G3/8 | 25 | R3/8 | NPT3/8 | 25 | |
(14) | M20×1.5 | 25 | M18×1.5 | 25 | M18×1.5 | 25 | M18×1.5 | G1/2 | 25 | R1/2 | NPT1/2 | 25 | |
15 | M22×1.5 | 25 | M18×1.5 | 25 | M18×1.5 | 25 | M18×1.5 | G1/2 | 25 | R1/2 | NPT1/2 | 25 | |
(16) | M24×1.5 | 25 | M20×1.5 | 25 | M20×1.5 | 25 | M20×1.5 | G1/2 | 25 | R1/2 | NPT1/2 | 25 | |
18 | M26×1.5 | 16 | M22×1.5 | 16 | M22×1.5 | 16 | M22×1.5 | G1/2 | 16 | R1/2 | NPT1/2 | 16 | |
22 | M30×2 | 16 | M26×1.5 | 16 | M26×1.5 | 16 | M26×1.5 | G3/4 | 16 | R3/4 | NPT3/4 | 16 | |
28 | M36×2 | 10 | M33×2 | 10 | M33×2 | 10 | M33×2 | G1 | 10 | R1 | NPT1 | 10 | |
35 | M45×2 | 10 | M42×2 | 10 | M42×2 | 10 | M42×2 | G1-1/4 | 10 | R1-1/4 | NPT1-1/4 | 10 | |
42 | M52×2 | 10 | M48×2 | 10 | M48×2 | 10 | M48×2 | G1-1/2 | 10 | R1-1/2 | NPT1-1/2 | 10 | |
S | 6 | M14×1.5 | 63 | M12×1.5 | 63 | M12×1.5 | 40 | M12×1.5 | G1/4 | 63 | R1/4 | NPT1/4 | 40 |
8 | M16×1.5 | 63 | M14×1.5 | 63 | M14×1.5 | 40 | M14×1.5 | G1/4 | 63 | R1/4 | NPT1/4 | 40 | |
10 | M18×1.5 | 63 | M16×1.5 | 63 | M16×1.5 | 40 | M16×1.5 | G3/8 | 63 | R3/8 | NPT3/8 | 40 | |
12 | M20×1.5 | 63 | M18×1.5 | 63 | M18×1.5 | 40 | M18×1.5 | G1/2 | 63 | R1/2 | NPT1/2 | 40 | |
(14) | M22×1.5 | 63 | M20×1.5 | 63 | M20×1.5 | 40 | M20×1.5 | G1/2 | 63 | R1/2 | NPT1/2 | 40 | |
16 | M24×1.5 | 40 | M22×1.5 | 40 | M22×1.5 | 40 | M22×1.5 | G3/4 | 40 | R3/4 | NPT3/4 | 40 | |
20 | M30×2 | 40 | M27×2 | 40 | M27×2 | 40 | M27×2 | G3/4 | 40 | R3/4 | NPT3/4 | 40 | |
25 | M36×2 | 40 | M33×2 | 40 | M33×2 | 25 | M33×2 | G1 | 40 | R1 | NPT1 | 25 | |
30 | M42×2 | 25 | M42×2 | 25 | M42×2 | 16 | M42×2 | G1-1/4 | 25 | R1-1/4 | NPT1-1/4 | 16 | |
38 | M52×2 | 25 | M48×2 | 25 | M48×2 | 16 | M48×2 | G1-1/2 | 25 | R1-1/2 | NPT1-1/2 | 16 | |
注1:A型和E型螺纹柱端应符合GB/T 19674.2;B型螺纹柱端应符合GB/T 19674.3。 注2:对于更高压力和动态应用,应咨询制造商。 注3:尽可能不采用括号内的规格。 | |||||||||||||
a 设计系数:4:1。 b 1MPa=10bar=106N/m2=106Pa。 |
表3 24°锥密封焊接接管的壁厚
系列 | 管子 外径 mm | 最大工作压力/MPa | |||||||||||
10 | 16 | 25 | 31.5 | 40 | 63 | ||||||||
内径 | 壁厚 | 内径 | 壁厚 | 内径 | 壁厚 | 内径 | 壁厚 | 内径 | 壁厚 | 内径 | 壁厚 | ||
L | 6 | 3 | 1.5 | 3 | 1.5 | 3 | 1.5 |
| |||||
8 | 5 | 1.5 | 5 | 1.5 | 5 | 1.5 | |||||||
10 | 7 | 1.5 | 7 | 1.5 | 7 | 1.5 | |||||||
12 | 8 | 2 | 8 | 2 | 8 | 2 | |||||||
(14) | 10 | 2 | 10 | 2 | 10 | 2 | |||||||
15 | 10 | 2.5 | 10 | 2.5 | 10 | 2.5 | |||||||
(16) | 11 | 2.5 | 11 | 2.5 | 11 | 2.5 | |||||||
18 | 13 | 2.5 | 13 | 2.5 |
| ||||||||
22 | 17 | 2.5 | 17 | 2.5 | |||||||||
28 | 23 | 2.5 |
| ||||||||||
35 | 29 | 3 | |||||||||||
42 | 36 | 3 | |||||||||||
S | 6 | 2.5 | 1.75 | 2.5 | 1.75 | 2.5 | 1.75 | 2.5 | 1.75 | 2.5 | 1.75 | 2.5 | 1.75 |
8 | 4 | 2 | 4 | 2 | 4 | 2 | 4 | 2 | 4 | 2 | 4 | 2 | |
10 | 6 | 2 | 6 | 2 | 6 | 2 | 6 | 2 | 6 | 2 | 5 | 2.5 | |
12 | 8 | 2 | 8 | 2 | 8 | 2 | 8 | 2 | 7 | 2.5 | 6 | 3 | |
(14) | 9 | 2.5 | 9 | 2.5 | 9 | 2.5 | 9 | 2.5 | 8 | 3 | 7 | 3.5 | |
16 | 11 | 2.5 | 11 | 2.5 | 11 | 2.5 | 11 | 2.5 | 10 | 3 |
| ||
20 | 14 | 3 | 14 | 3 | 14 | 3 | 14 | 3 | 12 | 4 | |||
25 | 19 | 3 | 19 | 3 | 19 | 3 | 17 | 4 | 16 | 4.5 | |||
30 | 24 | 3 | 24 | 3 | 22 | 4 |
| ||||||
38 | 32 | 3 | 32 | 3 | 28 | 5 | |||||||
注1:对于超出本标准规定压力-温度的应用,应咨询制造商。 注2:尽可能不采用括号内的规格。 |
被连接碳钢钢管应采用符合GB/T 3639规定的低碳钢正火态(NBK)无缝钢管;不锈钢管应符合ISO 1127规定的退火态无缝钢管。如果使用其他材料,由供需双方确定。
锻制扳拧对边尺寸小于或等于24mm时的极限偏差为0,-0.8mm,大于24mm时的极限偏差为0,-1.0mm。
六方对边尺寸S的公差应符合GB/T 3103.1的B级产品耍求。六方对角尺寸应不小于1.092S,扳拧边长应不小于0.43S.如果无另外规定或标注。六方应倒角10°~30°,倒角直径应等于六方对边尺寸S,倒角直径公差应0,-0.4mm。
外型结构:卡套式管接头型式与尺寸应符合相应标准的要求。标准中未规定的结构尺寸由制造商确定,但应尽量减少流体阻力。
尺寸:标准中规定的尺寸是指包括镀层或表面处理层厚度在内的成品尺寸,所有未注尺寸公差应为±0.4mm,卡套端的24°内锥座对其外螺纹中径的圆跳动公差应为0.25mm,柱端螺纹中径对密封端面的垂直度公差应为0.10mm。
通道公差:接头体通道从两头加工时,汇合点的不重合偏差不得大于0.4mm,交叉通道的交汇横截面积不得低于规定的最小通道截面积。
角度公差:规格不大于10mm的弯通、三通和四通的端口轴线的角度公差应为±2.5°,规格大于10mm 的弯通、三通和四通的端口轴线的角度公差应为±1.5°。
螺纹:普通螺纹应符合GB/T 193的规定,外螺纹公差应符合GB/T 197的6g级规定,内螺纹公差应符合GB/T 197的6H级规定,端面应倒角。螺纹收尾、肩距、退刀槽应符合GB/T 3的规定。电镀后,外螺纹用6h级通规验收。
55°非密封管螺纹应符合GB/T 7307的规定,外螺纹公差为A级,端面应倒角。
55°密封管螺纹应符合GB/T 7306.1或GB/T 7306.2的规定,端面应倒角。
60°密封管螺纹应符合GB/T 12716的规定,端面应倒角。
制造质量:所有接头体和配件不应有裂纹、气孔、毛剌、锐边等。接头体24°内外锥面和组合接头体、可调向接头体及锥密封体的O形圈沟槽表面粗糙度Ra≤3.2µm。不进行机械加工的零件表面允许有不超过其尺寸公差一半的凹陷和压痕。未标注要求的所有机械加工表面的粗糙度Ra≤6.3µm。所有未注棱边应倒钝角,倒角尺寸不应大于0.15mm。
表面处理:如果供需双方没有其他协议,所有碳钢零件的外表面和螺纹应镀涂适当材料,通过72h中性盐雾试验。除下列区域外的任何盐雾试验红锈斑都应视为镀涂不合格。
——孔内壁表面;
——在批量生产的镀涂操作中或交付运输中有可能碰伤的六角顶、齿状结构顶、螺纹牙顶等;
——折、扩、弯或其他镀后成型操作有损伤镀涂的区域;
——试验中的悬挂或固定处(有可能有盐雾淤积)。
需焊接的零件应涂油膜或磷化或经其他不影响焊接的防锈处理。
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