Blind Flange
Application Scenarios:
● Segmental blocking for pipeline hydraulic/pneumatic pressure test, sealing of spare reserved connections on equipment;
● Pipeline maintenance isolation in oil & gas stations and chemical plants to cut off medium flow;
● Sealing of spare nozzles for pressure vessels and boilers;
● Temporary sealing of reserved expansion ports on municipal pipe networks.
● Segmental blocking for pipeline hydraulic/pneumatic pressure test, sealing of spare reserved connections on equipment;
● Pipeline maintenance isolation in oil & gas stations and chemical plants to cut off medium flow;
● Sealing of spare nozzles for pressure vessels and boilers;
● Temporary sealing of reserved expansion ports on municipal pipe networks.
Product Model
Description
- 产品描述
-
Product Overview
Solid disc structure without flow bore. It is sealed against the pipe end by bolt tightening, used for pipeline blocking and isolation.
Core Technical Parameter Table
Parameter Item Parameter Value Abbreviation BL Full Product Name Blind Flange GB Standard Materials Carbon Steel:20#
Alloy Steel:16Mn、20MnMo、15CrMo、12Cr1MoV、14Cr1Mo、12Cr2Mo1、12Cr2Mo1V、12Cr5Mo、10Cr9Mo1VNbN、30CrMo、35CrMo
Low Temperature Steel:16MnD、20MnMoD、09MnNiD
Austenitic Stainless Steel:S30408 (304)、S30403 (304L)、S30409 (304H)、S32168 (321)、S32169 (321H) 、S34778 (347)、S34779 (347H) 、S31608 (316) 、S31603 (316L) 、S31609 (316H)
Duplex Stainless Steel:S22053 (2205)ASTM & ASME Materials Carbon Steel:A105
Low Temperature Carbon Steel (A350):LF2、LF3、LF6
Line Pipe Steel (A694):F52、F60、F65、 F70
Low Alloy Steel (A182):F5、F5a、F9、F91、F92、F11 (Cl.1/2/3)、F22 (Cl.1/3)
Austenitic Stainless Steel (A182):F304、F304L、F304H、F316、F316L、F316H、F321、F321H、F347、F347H
Duplex Stainless Steel (A182):F51 (2205)、F60 (S32205)Sealing Face Type RF、FF、MFM、TG、RTJ PN Pressure Rating (GB Standard) PN06、PN10、PN16、PN25、PN40、PN63、PN100、PN160、PN250 Class Pressure Rating (ASME Standard) Class 150、300、600、900、1500、2500 Certifications API/ISO/CE Payment Terms L/C, D/P, T/T Delivery Lead Time 10-30 day Production Capacity 5000TONS/MONTH Applicable Standard The company manufactures flange products complying with international and domestic standards including ANSI B16.5, ASME B16.47/16.48, DIN EN 1092-1/2, JIS B2220, GOST 12821-80, GB/T 9124.1, SH/T 3406, SH/T 3426, SH/T 3425, HG/T 20615 and HG/T 20592. Product Parameters
● HG/T20622-2009 (BL)
Class150(PN20)
（mm）
Nominal Dimension Flange Outside Diameter
DConnection Dimension Flange Thickness
CTheoretical Weight
KgDN NPS Bolt Circle Diameter
KBolt Hole Diameter
LBolt
ThNumber of Bolt Holes
n(pcs)15 ½ 90 88.9 60.3 16 15.7 M14 4 9.6 0.42 20 3/4 100 98.6 69.9 16 15.7 M14 4 11.2 0.61 25 1 110 108 79.4 16 15.7 M14 4 12.7 0.86 32 1¼ 115 117.3 88.9 16 15.7 M14 4 14.3 1.17 40 1½ 125 127 98.4 16 15.7 M14 4 15.9 1.53 50 2 150 152.4 120.7 18 19.1 M16 4 17.5 2.42 65 2½ 180 177.8 139.7 18 19.1 M16 4 20.7 3.94 80 3 190 190.5 152.4 18 19.1 M16 4 22.3 4.93 100 4 230 228.6 190.5 18 19.1 M16 8 22.3 7 125 5 255 254 215.9 22 22.4 M20 8 22.3 8.63 150 6 280 279.4 241.3 22 22.4 M20 8 23.9 11.3 200 8 345 342.9 298.58 22 22.4 M20 8 27.0 19.6 250 10 405 406.4 362.0 26 25.4 M24 12 28.6 28.8 300 12 485 482.6 431.8 26 25.4 M24 12 30.2 43.2 350 14 535 533.4 476.3 30 28.4 M27 12 33.4 58.1 400 16 595 596.9 539.8 30 28.4 M27 16 35.0 76 450 18 635 635 577.9 33 31.75 M30 16 38.1 93.7 500 20 700 698.5 635.0 33 31.75 M30 20 41.3 122 600 24 815 812.8 749.3 36 35.1 M33 20 46.1 185 Class300(PN50)
（mm）
Nominal Dimension Flange Outside Diameter
DConnection Dimension Flange Thickness
CTheoretical Weight
KgDN NPS Bolt Circle Diameter
KBolt Hole Diameter
LBolt
ThNumber of Bolt Holes
n(pcs)15 ½ 95 88.9 66.7 16 15.7 M14 4 12.7 0.64 20 ¾ 115 98.6 82.6 18 15.7 M16 4 14.3 1.11 25 1 125 108 88.9 18 15.7 M16 4 15.9 1.39 32 1¼ 135 117.3 98.4 18 15.7 M16 4 17.5 1.79 40 1½ 155 127 114.3 22 15.7 M20 4 19.1 2.66 50 2 165 152.4 127.0 18 19.1 M16 8 20.7 3.18 65 2½ 190 177.8 149.2 22 19.1 M20 8 23.9 4.85 80 3 210 190.5 168.3 22 19.1 M20 8 27.0 6.81 100 4 255 228.6 200.0 22 19.1 M20 8 30.2 11.5 125 5 280 254 235.0 22 22.4 M20 8 33.4 15.6 150 6 320 279.4 269.9 22 22.4 M20 12 35.0 20.9 200 8 380 342.9 330.2 26 22.4 M24 12 39.7 34.3 250 10 445 406.4 387.4 30 25.4 M27 16 46.1 53.3 300 12 520 482.6 450.8 33 25.4 M30 16 49.3 78.8 350 14 585 533.4 514.4 33 28.4 M30 20 52.4 105 400 16 650 596.9 571.5 36 28.4 M33 20 55.6 137 450 18 710 635 628.6 36 31.75 M33 24 58.8 175 500 20 775 698.5 685.8 36 31.75 M33 24 62.0 221 600 24 915 812.8 812.8 42 35.1 M39×3 24 68.3 339 Class600(PN110)
（mm）
Nominal Dimension Flange Outside Diameter
DConnection Dimension Flange Thickness
CTheoretical Weight
KgDN NPS Bolt Circle Diameter
KBolt Hole Diameter
LBolt
ThNumber of Bolt Holes
n(pcs)15 ½ 95 88.9 66.7 16 15.7 M14 4 14.3 0.76 20 ¾ 115 98.6 82.6 18 15.7 M16 4 15.9 1.28 25 1 125 108 88.9 18 15.7 M16 4 17.5 1.6 32 1¼ 135 117.3 98.4 18 15.7 M16 4 20.7 2.23 40 1½ 155 127 114.3 22 15.7 M20 4 22.3 3.25 50 2 165 152.4 127.0 18 19.1 M16 8 25.4 4.15 65 2½ 190 177.8 169.2 22 19.1 M20 8 28.6 6.13 80 3 210 190.5 168.3 22 19.1 M20 8 31.8 8.44 100 4 275 228.6 215.9 26 19.1 M24 8 38.1 17.3 125 5 330 254 266.7 30 22.4 M27 8 44.5 29.4 150 6 355 279.4 292.1 30 22.4 M27 12 47.7 36.1 200 8 420 342.9 349.2 33 22.4 M30 12 55.6 58.9 250 10 510 406.4 431.8 36 25.4 M33 16 63.5 97.5 300 12 560 482.6 489.0 36 25.4 M33 20 66.7 124 350 14 605 533.4 527.0 39 28.4 M36×3 20 69.9 151 400 16 685 596.9 603.2 42 28.4 M39×3 20 76.2 214 450 18 745 635 654.0 45 31.75 M42×3 20 82.6 272 500 20 815 698.5 723.9 45 31.75 M42×3 24 88.9 349 600 24 940 812.8 838.2 51 35.1 M48×3 24 101.6 533 Class900(PN150)
（mm）
Nominal Dimension Flange Outside Diameter
DConnection Dimension Flange Thickness
CTheoretical Weight
KgDN NPS Bolt Circle Diameter
KBolt Hole Diameter
LBolt
ThNumber of Bolt Holes
n(pcs)15 ½ 120 88.9 82.6 22 15.7 M20 4 22.3 1.77 20 ¾ 130 98.6 88.9 22 15.7 M20 4 25.4 2.42 25 1 150 108 101.6 26 15.7 M24 4 28.6 3.57 32 1¼ 160 117.3 111.1 26 15.7 M24 4 28.6 4.15 40 1½ 180 127 123.8 30 15.7 M27 4 31.8 5.75 50 2 215 152.4 165.1 26 19.1 M24 8 38.1 10.1 65 2½ 245 177.8 190.5 30 19.1 M27 8 41.3 14 80 3 240 190.5 190.5 26 19.1 M24 8 38.1 13.1 100 4 290 228.6 235 33 19.1 M30 8 44.5 26.9 125 5 350 254 279.4 36 22.4 M33 8 50.8 36.5 150 6 380 279.4 317.5 33 22.4 M30 12 55.6 47.4 200 8 470 342.9 393.7 39 22.4 M36×3 12 63.5 82.5 250 10 545 406.4 469.9 39 25.4 M36×3 16 69.9 122 300 12 610 482.6 533.4 39 25.4 M36×3 20 79.4 173 350 14 640 533.4 558.8 42 28.4 M39×3 20 85.8 206 400 16 705 596.9 616 45 28.4 M42×3 20 88.9 259 450 18 785 635 685.8 51 31.75 M48×3 20 101.6 367 500 20 855 698.5 749.3 55 31.75 M52×3 20 108.0 463 600 24 1040 812.8 901.7 68 35.1 M64×3 20 139.7 876 Class1500(PN260)
（mm）
Nominal Dimension Flange Outside Diameter
DConnection Dimension Flange Thickness
CTheoretical Weight
KgDN NPS Bolt Circle Diameter
KBolt Hole Diameter
LBolt
ThNumber of Bolt Holes
n(pcs)15 ½ 120 120.6 82.6 22 22.3 M20 4 22.3 1.77 20 ¾ 130 130 88.9 22 22.3 M20 4 25.4 2.42 25 1 150 149.3 101.6 26 25.4 M24 4 28.6 3.57 32 1¼ 160 158.7 111.1 26 25.4 M24 4 28.6 4.15 40 1½ 180 177.8 123.8 30 28.4 M27 4 31.8 5.75 50 2 215 215.9 165.1 26 25.4 M24 8 38.1 10.1 65 2½ 245 244.3 190.5 30 28.4 M27 8 41.3 14 80 3 265 266.7 203.2 33 31.7 M30 8 47.7 19.1 100 4 310 311.1 241.3 36 35 M33 8 54.0 29.9 125 5 372 374.6 292.1 42 41.1 M39×3 8 73.1 58.4 150 6 395 393.7 317.5 39 38.1 M36×3 12 82.6 71.8 200 8 485 482.6 393.7 45 44.4 M42×3 12 92.1 122 250 10 585 582.2 482.6 51 50.8 M48×3 12 108.0 210 300 12 675 673.1 571.5 55 53.8 M52×3 16 123.9 316 350 14 750 749.3 635.0 60 60.45 M56×3 16 133.4 420 400 16 825 825.5 704.8 68 66.55 M64×3 16 146.1 558 450 18 915 914.4 774.7 74 73.15 M70×3 16 162.0 760 500 20 985 984.2 831.8 80 79.25 M76×3 16 177.8 965 600 24 1170 1168.4 990.6 94 91.9 M90×3 16 203.2 1558 Class2500(PN420)
（mm）
Nominal Dimension Flange Outside Diameter
DConnection Dimension Flange Thickness
CTheoretical Weight
KgDN NPS Bolt Circle Diameter
KBolt Hole Diameter
LBolt
ThNumber of Bolt Holes
n(pcs)15 ½ 135 133.4 88.9 22 22.4 M20 4 30.2 2.99 20 3/4 140 139.7 95.2 22 22.4 M20 4 31.8 3.5 25 1 160 158.8 108.0 26 25.4 M24 4 35.0 4.96 32 1¼ 185 184.2 130.2 30 28.4 M27 4 38.1 7.35 40 1½ 205 203.2 146.0 33 31.75 M30 4 44.5 10.4 50 2 235 535 171.4 30 28.4 M27 8 50.9 15.6 65 2½ 265 266.7 196.8 33 31.75 M30 8 57.2 22.6 80 3 305 304.8 228.6 36 35.1 M33 8 66.7 34.8 100 4 355 355.6 273.0 42 41.1 M39×3 8 76.2 53.9 125 5 420 419.1 323.8 48 47.88 M45×3 8 92.1 90.8 150 6 485 482.6 358.3 55 53.8 M52×3 8 108.0 141 200 8 550 552.5 438.2 55 53.8 M52×3 12 127.0 214 250 10 675 673.1 539.8 68 66.55 M64×3 12 165.1 411 300 12 760 762 619.1 74 73.15 M70M×3 12 184.2 592 
● HG/T20601-2009 (BL)
PN6
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 75 50 11 4 M10 12 15 80 55 11 4 M10 12 20 90 65 11 4 M10 14 25 100 75 11 4 M10 14 32 120 90 14 4 M12 14 40 130 100 14 4 M12 14 50 140 110 14 4 M12 14 65 160 130 14 4 M12 14 80 190 150 18 4 M16 16 100 210 170 18 4 M16 16 125 240 200 18 8 M16 18 150 265 225 18 8 M16 18 200 320 280 18 8 M16 20 250 375 335 18 12 M16 22 300 440 395 22 12 M20 22 350 490 445 22 12 M20 22 400 540 495 22 16 M20 22 450 595 550 22 16 M20 24 500 645 600 22 20 M20 24 600 755 705 26 20 M24 30 700 860 810 26 24 M24 40 800 975 920 30 24 M27 44 900 1075 1020 30 24 M27 48 1000 1175 1120 30 28 M27 52 1200 1405 1340 33 32 M30 60 1400 1630 1560 36 36 M33 68 1600 1830 1760 36 40 M33 76 1800 2045 1970 39 44 M36×3 84 2000 2265 2180 42 48 M39×3 92 PN10
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 90 60 14 4 M12 16 15 95 65 14 4 M12 16 20 105 75 14 4 M12 18 25 115 85 14 4 M12 18 32 140 100 18 4 M16 18 40 150 110 18 4 M16 18 50 165 125 18 4 M16 18 65 185 145 18 8 M16 18 80 200 160 18 8 M16 20 100 220 180 18 8 M16 20 125 250 210 18 8 M16 22 150 285 240 22 8 M20 22 200 340 295 22 8 M20 24 250 395 350 22 12 M20 26 300 445 400 22 12 M20 26 350 505 460 22 16 M20 26 400 565 515 26 16 M24 26 450 615 565 26 20 M24 28 500 670 620 26 20 M24 28 600 780 725 30 20 M27 34 700 895 840 30 24 M27 38 800 1015 950 33 24 M30 42 900 1115 1050 33 28 M30 46 1000 1230 1160 36 28 M33 52 1200 1455 1380 39 32 M33×3 60 PN16
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 90 60 14 4 M12 16 15 95 65 14 4 M12 16 20 105 75 14 4 M12 18 25 115 85 14 4 M12 18 32 140 100 18 4 M16 18 40 150 110 18 4 M16 18 50 165 125 18 4 M16 18 65 185 145 18 8 M16 18 80 200 160 18 8 M16 20 100 220 180 18 8 M16 20 125 250 210 22 8 M16 22 150 285 240 22 8 M20 22 200 340 295 26 12 M20 24 250 405 355 26 12 M24 26 300 460 410 26 12 M24 28 350 520 470 30 16 M24 30 400 580 525 30 16 M27 32 450 640 585 30 20 M27 40 500 715 650 33 20 M30 44 600 840 770 36 20 M33 54 700 910 840 36 24 M33 48 800 1025 950 39 24 M36×3 52 900 1125 1050 39 28 M36×3 58 1000 1255 1170 42 28 M39×3 64 1200 1485 1390 48 32 M45×3 76 PN25
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 90 60 14 4 M12 16 15 95 65 14 4 M12 16 20 105 75 14 4 M12 18 25 115 85 14 4 M12 18 32 140 100 18 4 M16 18 40 150 110 18 4 M16 18 50 165 125 18 4 M16 20 65 185 145 18 8 M16 22 80 200 160 18 8 M16 24 100 235 190 22 8 M20 24 125 270 220 26 8 M24 26 150 300 250 26 8 M24 28 200 360 310 26 12 M24 30 250 425 370 30 12 M27 32 300 485 430 30 16 M27 34 350 555 490 33 16 M30 38 400 620 550 36 16 M33 40 450 670 600 36 20 M33 46 500 730 660 36 20 M33 48 600 845 770 39 20 M36×3 58 PN40
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 90 60 14 4 M12 16 15 95 65 14 4 M12 16 20 105 75 14 4 M12 18 25 115 85 14 4 M12 18 32 140 100 18 4 M16 18 40 150 110 18 4 M16 18 50 165 125 18 4 M16 20 65 185 145 18 8 M16 22 80 200 160 18 8 M16 24 100 235 190 22 8 M20 24 125 270 220 26 8 M24 26 150 300 250 26 8 M24 28 200 375 320 30 12 M27 36 250 450 385 33 12 M30 38 300 515 450 33 16 M30 42 350 580 510 36 16 M33 46 400 660 585 39 16 M36×3 50 450 685 610 39 20 M36×3 57 500 755 670 42 20 M39×3 57 600 890 795 48 20 M45×3 72 PN63
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 100 70 14 4 M12 20 15 105 75 14 4 M12 20 20 130 90 18 4 M16 22 25 140 100 18 4 M16 24 32 155 110 22 4 M20 24 40 170 125 22 4 M20 26 50 180 135 22 4 M20 26 65 205 160 22 8 M20 26 80 215 170 22 8 M20 28 100 250 200 26 8 M24 30 125 295 240 30 8 M27 34 150 345 280 33 8 M30 36 200 415 345 36 12 M33 42 250 470 400 36 12 M33 46 300 530 460 36 16 M33 52 350 600 525 39 16 M36×3 56 400 670 585 42 16 M39×3 60 PN100
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 100 70 14 4 M12 20 15 105 75 14 4 M12 20 20 130 90 18 4 M16 22 25 140 100 18 4 M16 24 32 155 110 22 4 M20 24 40 170 125 22 4 M20 26 50 195 145 26 4 M24 28 65 220 170 26 8 M24 30 80 230 180 26 8 M24 32 100 265 210 30 8 M27 36 125 315 250 33 8 M30 40 150 355 290 33 12 M30 44 200 430 360 36 12 M33 52 250 505 430 39 12 M36×3 60 300 585 500 42 16 M39×3 68 350 655 560 48 16 M45×3 74 400 715 620 48 16 M45×3 82 PN160
（mm）
Nominal Dimension
DNFlange Outside Diameter
DConnection Dimension Flange Thickness
CBolt Circle Diameter
KBolt Hole Diameter
LNumber of Bolt Holes
n(pcs)Bolt
Th10 100 70 14 4 M12 24 15 105 75 14 4 M12 26 20 130 90 18 4 M16 30 25 140 100 18 4 M16 32 32 155 110 22 4 M20 34 40 170 125 22 4 M20 36 50 195 145 26 4 M24 38 65 220 170 26 8 M24 42 80 230 180 26 8 M24 46 100 265 210 30 8 M27 52 125 315 250 33 8 M30 56 150 355 290 33 12 M30 62 200 430 360 36 12 M33 66 250 515 430 42 12 M39×3 76 300 585 500 42 16 M39×3 88 Production Process
FAQs
Basic info about your pipe fitting factory, establishment year and location?
Cangzhou Dongjun Pipe was founded in 2000, located in Buzhai Industrial Zone, Mengcun — China’s well-known capital of elbows and pipe fittings. We enjoy convenient transport near Huanghua Port, Beijing and Tianjin. Our annual production capacity reaches 20,000 tons, with 230 employees including 45 professional technical engineers. Factory visits are welcome.
What main pipe fitting products can you provide?
We manufacture high, medium and low pressure steel pipeline components. Main products include flanges, elbows, tees, reducers, socket weld inserts, nozzles and pipe supports. We have more than 1000 specifications covering mainstream pipeline accessories to realize one-stop procurement.
What metal materials are available for your pipe fittings?
We supply carbon steel, alloy steel, stainless steel, duplex steel and nickel-based alloy to fit different temperature, pressure and corrosion environments. If you need special custom metal materials for special working conditions, our technical team can also meet your requirements.
Which international standards do your products comply with?
Our products support GB, ASME, DIN and JIS standards. Every batch of goods can be matched with EN10204:2004 official test reports, which are widely recognized by engineering supervisors in global projects.
How do you control product quality before delivery?
We own over 200 sets of professional production and testing equipment, including full NDT devices, spectrometers and mechanical testing machines. Raw material inspection, semi-finished product testing and finished product full inspection will be completed strictly before shipment to avoid defective goods.
What certifications does your factory hold for project bidding?
We have ISO9001/14001/45001 system certificates, API Spec Q1 10th Edition certificate and China Special Equipment Manufacturing License for pressure pipeline components. All valid certificates can be provided for your tender review at any time.
Qualification
Blind Flange
Application Scenarios:
● Segmental blocking for pipeline hydraulic/pneumatic pressure test, sealing of spare reserved connections on equipment;
● Pipeline maintenance isolation in oil & gas stations and chemical plants to cut off medium flow;
● Sealing of spare nozzles for pressure vessels and boilers;
● Temporary sealing of reserved expansion ports on municipal pipe networks.
● Segmental blocking for pipeline hydraulic/pneumatic pressure test, sealing of spare reserved connections on equipment;
● Pipeline maintenance isolation in oil & gas stations and chemical plants to cut off medium flow;
● Sealing of spare nozzles for pressure vessels and boilers;
● Temporary sealing of reserved expansion ports on municipal pipe networks.
OUR SERVICE
We offers a wealth of product support resources, including a range of technical and downloadable product manuals to product certifications.
Our Service Product CatalogCOMPANY STRENGTHS
Experience
26 years of professional pipe fittings production and customization experience, with 45 senior technical engineers to support project development.
OEM/ODM
Full support OEM & ODM customization. We produce carbon/alloy/stainless steel fittings with 1000+ specs complying with GB, ASME, DIN, JIS standards.
Reliable Quality
Strict raw material selection & full-process inspection. Our lab equips complete devices for chemical analysis, mechanical test and NDT.
Certification
Possess full authoritative qualifications: ISO triple system, API Spec Q1, national pressure pipeline manufacturing license, EN10204 test certificates available.
Export
Located in Mengcun pipe fittings hub adjacent to Huanghua Port. Products cover all China provinces and export to Southeast Asia, Middle East, South America and more.
Advanced Equipment & Tech
200+ sets of advanced forging, CNC machining and full inspection equipment, annual output reaches 20,000 tons of high-pressure pipe fittings.