标準規定了卡套式管接頭的材料、壓力-溫度要求、标記方法、被連接管要求、扳擰尺寸與公差、結構與制造、性能和試驗要求、安裝說明、采購信息、标志等技術要求。
本标準适用于管子外徑為4mm～42mm、最大工作壓力為10～63MPa的液壓流體傳動和一般用途的管路系統。
注：在新設計的液壓流體動力系統中，應采用F型螺紋柱端。
5.1 符合卡套式管接頭标準的碳鋼管接頭，在介質溫度為-40℃～+120℃範圍使用時，應能承受表1和表2規定的工作壓力，不同工作壓力下24°錐密封焊接接管的壁厚應符合表3的規定。
5.2 除非另有規定，對于帶彈性密封件的管接頭，用于石油基液壓油系統時應給與特别的工作溫度範圍，其工作溫度範圍可能縮小，也可能完全不适用于其他流體。制造商可提供适用于不同介質能滿足溫度範圍要求的彈性密封件。
5.3 根據不同的壓力等級和使用條件，将卡套式管接頭分為以下三個系列：
——LL：超輕載系列；
——L：輕載系列；
——S：重載系列。
表1 用于液壓流體動力與一般用途卡套式管接頭的工作壓力
系列 | 管子外徑 mm | 卡套連接與錐體連接 | F型螺紋柱端 | ||
普通螺紋 | 最大工作壓力a MPab | 普通螺紋 | 最大工作壓力 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型螺紋柱端按附錄A。 注2：對于更高壓力和動态應用，應咨詢制造商。 注3：盡可能不采用括号内的規格。 | |||||
a 設計系數：4：1。 b 1MPa=10bar=106N/m2=106Pa。 | |||||
表2 用于一般用途卡套式管接頭的工作壓力
系列 | 管子 外徑 mm | 卡套連接與 錐體連接 | E型螺紋柱端 | B型螺紋柱端 | A型螺紋柱端 | 錐螺紋柱端 | |||||||
普通螺紋 | 最大 工作 壓力a MPab | 普通螺紋 | 最大 工作 壓力a MPab | 普通螺紋 | 最大 工作 壓力a MPab | 普通螺紋 | 55° 非密封管螺紋 | 最大 工作 壓力a MPab | 55° 密封管螺紋 | 60° 密封管螺紋 | 最大 工作 壓力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型螺紋柱端應符合GB/T 19674.2；B型螺紋柱端應符合GB/T 19674.3。 注2：對于更高壓力和動态應用，應咨詢制造商。 注3：盡可能不采用括号内的規格。 | |||||||||||||
a 設計系數：4：1。 b 1MPa=10bar=106N/m2=106Pa。 | |||||||||||||
表3 24°錐密封焊接接管的壁厚
系列 | 管子 外徑 mm | 最大工作壓力/MPa | |||||||||||
10 | 16 | 25 | 31.5 | 40 | 63 | ||||||||
内徑 | 壁厚 | 内徑 | 壁厚 | 内徑 | 壁厚 | 内徑 | 壁厚 | 内徑 | 壁厚 | 内徑 | 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：對于超出本标準規定壓力-溫度的應用，應咨詢制造商。 注2：盡可能不采用括号内的規格。 | |||||||||||||
被連接碳鋼鋼管應采用符合GB/T 3639規定的低碳鋼正火态(NBK)無縫鋼管；不鏽鋼管應符合ISO 1127規定的退火态無縫鋼管。如果使用其他材料，由供需雙方确定。
鍛制扳擰對邊尺寸小于或等于24mm時的極限偏差為0，-0.8mm，大于24mm時的極限偏差為0，-1.0mm。
六方對邊尺寸S的公差應符合GB/T 3103.1的B級產品耍求。六方對角尺寸應不小于1.092S，扳擰邊長應不小于0.43S.如果無另外規定或标注。六方應倒角10°～30°，倒角直徑應等于六方對邊尺寸S，倒角直徑公差應0，-0.4mm。
外型結構：卡套式管接頭型式與尺寸應符合相應标準的要求。标準中未規定的結構尺寸由制造商确定，但應盡量減少流體阻力。
尺寸：标準中規定的尺寸是指包括鍍層或表面處理層厚度在内的成品尺寸，所有未注尺寸公差應為±0.4mm，卡套端的24°内錐座對其外螺紋中徑的圓跳動公差應為0.25mm，柱端螺紋中徑對密封端面的垂直度公差應為0.10mm。
通道公差：接頭體通道從兩頭加工時，彙合點的不重合偏差不得大于0.4mm，交叉通道的交彙橫截面積不得低于規定的最小通道截面積。
角度公差：規格不大于10mm的彎通、三通和四通的端口軸線的角度公差應為±2.5°，規格大于10mm 的彎通、三通和四通的端口軸線的角度公差應為±1.5°。
螺紋：普通螺紋應符合GB/T 193的規定，外螺紋公差應符合GB/T 197的6g級規定，内螺紋公差應符合GB/T 197的6H級規定，端面應倒角。螺紋收尾、肩距、退刀槽應符合GB/T 3的規定。電鍍後，外螺紋用6h級通規驗收。
55°非密封管螺紋應符合GB/T 7307的規定，外螺紋公差為A級，端面應倒角。
55°密封管螺紋應符合GB/T 7306.1或GB/T 7306.2的規定，端面應倒角。
60°密封管螺紋應符合GB/T 12716的規定，端面應倒角。
制造質量：所有接頭體和配件不應有裂紋、氣孔、毛剌、銳邊等。接頭體24°内外錐面和組合接頭體、可調向接頭體及錐密封體的O形圈溝槽表面粗糙度Ra≤3.2µm。不進行機械加工的零件表面允許有不超過其尺寸公差一半的凹陷和壓痕。未标注要求的所有機械加工表面的粗糙度Ra≤6.3µm。所有未注棱邊應倒鈍角，倒角尺寸不應大于0.15mm。
表面處理：如果供需雙方沒有其他協議，所有碳鋼零件的外表面和螺紋應鍍塗适當材料，通過72h中性鹽霧試驗。除下列區域外的任何鹽霧試驗紅鏽斑都應視為鍍塗不合格。
——孔内壁表面；
——在批量生產的鍍塗操作中或交付運輸中有可能碰傷的六角頂、齒狀結構頂、螺紋牙頂等；
——折、擴、彎或其他鍍後成型操作有損傷鍍塗的區域；
——試驗中的懸挂或固定處（有可能有鹽霧淤積）。
需焊接的零件應塗油膜或磷化或經其他不影響焊接的防鏽處理。
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