Spring Return Pneumatic Actuator Introduction
The spring return pneumatic actuator is a versatile device designed to control valves using the rotational movement of the gear shaft. Similar to the rack and pinion actuator, it employs the meshing motion of the rack and gear, driven by the piston's force. This actuator offers an array of remarkable features that enhance its functionality and usability. Like its counterpart, it has achieved a CE certificate, underscoring its adherence to stringent quality and safety standards. Moreover, it complies with international standards, including NAMUR, ISO5211, and DIN, ensuring seamless integration and compatibility with a wide range of valve systems. Featuring an integrated design, the spring return pneumatic actuator prioritizes stability and superior construction. Its well-engineered structure guarantees reliable and consistent performance, even in challenging operational conditions. With a dual piston rack and pinion design, this actuator delivers exceptional output power, enabling precise and efficient valve control. The dual piston mechanism empowers the actuator to generate substantial force, ensuring optimal valve functionality. In addition to the shared features with the rack and pinion actuator, the spring return pneumatic actuator possesses several distinct characteristics. It operates through single-acting switching actions, driven solely by the air supply, with the closing action achieved through spring return. This single-acting functionality provides options for both normally open and normally closed configurations, enabling precise control over gas flow. The structure of the spring return pneumatic actuator is simple, with only one air intake (exhaust) at a single end. This simplicity translates into minimal air consumption, contributing to cost efficiency and energy savings. Resetting the actuator is accomplished either through spring force or diaphragm force. A portion of the compressed air energy is utilized to overcome the spring tension or diaphragm resistance, resulting in a reduction of the piston rod's output force. The cylinder of this actuator houses springs, diaphragms, and other crucial components, resulting in a generally short stroke length. In comparison to double-acting pneumatic actuators of the same size, the effective stroke of the spring return actuator is relatively smaller. Additionally, the tension of the cylinder return spring and the diaphragm varies with deformation, consequently influencing the output force of the piston rod during travel.| Product | Spring Return Pneumatic Actuator |
| Structure | Rack and Pinion Rotary Actuator |
| Rotary Angle | 0-90 Degree |
| Air Supply Pressure | 2.5-8 Bar |
| Actuator Body Material | Aluminum Alloy |
| Surface Treatment | Hard Anode Oxidation |
| Operating Temperature | Standard Temperature:-20℃ ~ 80℃Low Temperature:-15℃ ~ 150℃ High Temperature:-35℃ ~ 80℃ |
| Connection Standard | Air interface: NAMURMounting Hole: ISO5211 & DIN3337(F03-F25) |
| Application | Ball Valve, Butterfly Valve & Rotary Machines |
| Cover Color | Blue,Black,Orange,Red & Customized Colors as Customer needs |
Components & Materials of Pneumatic Actuator
| Part Number | Each Number | Part Name | Standard Materials | Selected Materials |
| 01 | 1 | Left Cover | Aluminum Die Casting | Stainless Steel |
| 02 | 1 | Right Cover | Aluminum Die Casting | Stainless Steel |
| 03 | 1 | Body | Aluminum extrusion | Stainless Steel |
| 04 | 2 | Piston | Aluminum Die Casting | ---- |
| 05 | 1 | Output Shaft | Carbon Steel | Stainless Steel |
| 06 | 1 | Cam adjustment | Stainless Steel | ---- |
| 07 | 2 | O-ring(Cover) | NBR | Fluorine or Silicone Rubber |
| 08 | 2 | O-ring(Piston) | NBR | Fluorine or Silicone Rubber |
| 09 | 1 | O-ring(output shaft bottom) | NBR | Fluorine or Silicone Rubber |
| 10 | 1 | O-ring(output shaft at the top) | NBR | Fluorine or Silicone Rubber |
| 11 | 2 | O-ring(adjusting screw) | NBR | Fluorine or Silicone Rubber |
| 12 | 2 | Plug(Cylinder) | NBR | Fluorine or Silicone Rubber |
| 13 | 2 | Bearing(Piston) | POM | ---- |
| 14 | 1 | Bearing(output shaft at the top) | POM | ---- |
| 15 | 1 | Bearing(output shaft bottom) | POM | ---- |
| 16 | 1 | Guide with Bearing(Piston Back) | POM | ---- |
| 17 | 2 | Thrust bearings(output shaft) | POM | ---- |
| 18 | 2 | Gasket(output shaft) | Stainless Steel | ---- |
| 19 | 1 | Flexible file ring | Stainless Steel | ---- |
| 20 | 8 | Cover bolt | Stainless Steel | ---- |
| 21 | 8 | Cover Gasket | Stainless Steel | ---- |
| 22 | 2 | Gasket | Stainless Steel | ---- |
| 23 | 2 | Nut | Stainless Steel | ---- |
| 24 | 2 | Adjustment bolt | Stainless Steel | ---- |
| 25 | 5-16 | Spring Components | Alloy Spring Steel | ---- |
| 26 | 1 | Position indicator | POM | ---- |
| 27 | 1 | Screw of Indicator | POM | ---- |
| AT - 160 S - K10 F10/12 P27 - 90 - B - A | A ---Corrosion Resistance Grade: A, B |
| B ---Ambient Temp.: Standard-B, Low Temp.: D, High Temp.: G | |
| 90 ---Rotation Angle: 00~900, 00~1200, 00~1800, 3 Position, 00~450~900 | |
| P27 ---Shaft Size Code: P-Star Square, H-Parallel Opposite Hole, W Two Key Hole | |
| F10/12 ---Connection: ISO 5211, Flange Size: F03-F25 | |
| K10 ---Spring QTY: K5-K16, Not Available for Double Acting | |
| S ---Type: D-Double Acting, S-Spring Return | |
| 160 ---Cylinder Size:32-400 | |
| AT --- AT Series Pneumatic Actuator |
AT Series Double Acting Rack and Pinion Pneumatic Actuator Torque(N.m.)
| ModelAir Pressure | Air Supply Pressure(Unit: Bar) | ||||||||
| 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 7 | 8 | |
| AT-40D | 5.7 | 6.7 | 7.6 | 8.6 | 9.5 | 10.5 | 11.4 | 13.3 | 15.2 |
| AT-52D | 12.0 | 14.0 | 16.0 | 18.0 | 20.0 | 22.0 | 24.0 | 28.0 | 32.0 |
| AT-63D | 21.0 | 24.5 | 28.0 | 31.5 | 35.0 | 38.5 | 42.0 | 49.0 | 56.0 |
| AT-75D | 30.0 | 35.0 | 40.0 | 45.0 | 50.0 | 55.0 | 60.0 | 70.0 | 80.0 |
| AT-83D | 45.7 | 53.3 | 61.0 | 68.6 | 76.2 | 83.8 | 91.4 | 106.7 | 121.9 |
| AT-92D | 67.4 | 78.7 | 89.9 | 101.2 | 112.4 | 123.6 | 134.9 | 157.4 | 179.8 |
| AT-105D | 97.6 | 113.9 | 130.2 | 146.4 | 162.7 | 179.0 | 195.2 | 227.8 | 260.3 |
| AT-125D | 152.2 | 177.6 | 203.0 | 228.3 | 253.7 | 279.1 | 304.4 | 355.2 | 405.9 |
| AT-140D | 260.3 | 303.7 | 347.0 | 390.4 | 433.8 | 477.2 | 520.6 | 607.3 | 694.1 |
| AT-160D | 396.6 | 462.7 | 528.8 | 594.9 | 661.0 | 727.1 | 793.2 | 925.4 | 1057.6 |
| AT-190D | 639.3 | 745.9 | 852.4 | 959.0 | 1065.5 | 1172.1 | 1278.6 | 1491.7 | 1704.8 |
| AT-210D | 781.0 | 911.2 | 1041.4 | 1171.5 | 1301.7 | 1431.9 | 1562.0 | 1822.4 | 2082.7 |
| AT-240D | 1147.6 | 1338.8 | 1530.1 | 1721.3 | 1912.6 | 2103.9 | 2295.1 | 2677.6 | 3060.2 |
| AT-270D | 1742.9 | 2033.4 | 2323.8 | 2614.3 | 2904.8 | 3195.3 | 3485.8 | 4066.7 | 4647.7 |
| AT-300D | 2390.8 | 2789.3 | 3187.8 | 3586.2 | 3984.7 | 4383.2 | 4781.6 | 5578.6 | 6375.5 |
| AT-350D | 3580 | 4176 | 4773 | 5369 | 5966 | 6563 | 7159 | 8352 | 9546 |
| AT-400D | 5100 | 5950 | 6800 | 7650 | 8500 | 9350 | 10200 | 11900 | 13600 |
AT Series Spring Return (Single Acting )Rack and Pinion Pneumatic Actuator Torque(N.m.)
| Air Pressure | Spring Torque | spring Torque | |||||||||||||||||||||
| Model | Spring Q.ty | 2.5bar | 3.0bar | 3.5bar | 4.0bar | 4.5bar | 5.0bar | 5.5bar | 6.0bar | 7.0bar | 8.0bar | ||||||||||||
| 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 00 | 900 | 900 | 00 | ||
| AT-52S | 5 6 7 8 9 10 11 12 | 5.7 5.0 | 3.8 2.6 | 7.7 7.0 6.1 | 5.8 4.6 3.4 | 9.7 9.0 8.1 7.3 | 7.8 6.6 5.4 4.1 | 11.7 11.0 10.1 9.3 8.4 | 9.8 8.6 7.4 6.1 4.9 | 13.7 13.0 12.1 11.3 10.4 9.5 | 11.8 10.6 9.4 8.1 6.9 5.6 | 15.7 15.0 14.1 13.3 12.4 11.5 10.7 | 13.8 12.6 11.4 10.1 8.9 7.6 6.4 | 17 16.1 15.3 14.4 13.5 12.7 11.8 | 14.6 13.4 12.1 10.9 9.6 8.4 7.2 | 18.1 17.3 16.4 15.5 14.7 13.8 | 13.4 12.1 10.9 9.6 8.4 7.2 | 21.3 20.4 19.5 18.7 17.8 | 18.1 16.9 15.6 14.4 13.2 | 24.4 23.5 22.7 21.8 | 20.9 19.6 18.4 17.2 | 6.2 7.4 8.6 9.9 11.1 12.4 13.6 14.8 | 4.3 5 5.9 6.7 7.6 8.5 9.3 10.2 |
| AT-63S | 5 6 7 8 9 10 11 12 | 10.7 9.3 | 7.1 5 | 14.2 12.8 11.4 | 10.6 8.5 6.4 | 17.7 16.3 14.9 13.6 | 14.1 12 9.9 7.8 | 21.2 19.8 18.4 17.1 15.7 | 17.6 15.5 13.4 11.3 9.2 | 24.7 23.3 21.9 20.6 19.2 17.8 | 21.1 19 16.9 14.8 12.7 10.6 | 28.2 26.8 25.4 24.1 22.7 21.3 20 | 24.6 22.5 20.4 18.3 16.2 14.1 12.1 | 30.3 28.9 27.6 26.2 24.8 23.5 22.1 | 26 23.9 21.8 19.7 17.6 15.6 13.5 | 32.4 31.1 29.7 28.3 27 25.6 | 23.9 21.8 19.7 17.6 15.6 13.5 | 38.1 36.7 35.3 34 32.6 | 32.3 30.2 28.1 26.1 24 | 43.7 42.3 41 39.6 | 37.2 35.1 33.1 31 | 10.4 12.5 14.6 16.7 18.8 20.9 22.9 25 | 6.8 8.2 9.6 10.9 12.3 13.7 15 16.4 |
| AT-75S | 5 6 7 8 9 10 11 12 | 14.5 12.3 | 10.5 7.6 | 19.5 17.3 15.2 | 15.5 12.6 9.7 | 24.5 22.3 20.2 18.1 | 20.5 17.6 14.7 11.8 | 29.5 27.3 25.2 23.1 21 | 25.5 22.6 19.7 16.8 13.9 | 34.5 32.3 30.2 28.1 26 23.9 | 30.5 27.6 24.7 21.8 18.9 16 | 39.5 37.3 35.2 33.1 31 28.9 26.8 | 35.5 32.6 29.7 26.8 23.9 21 18.1 | 42.3 40.2 38.1 36 33.9 31.8 29.7 | 37.6 34.7 31.8 28.9 26 23.1 20.3 | 45.2 43.1 41 38.9 36.8 34.7 | 34.7 31.8 28.9 26 23.1 20.3 | 53.1 51 48.9 46.8 44.7 | 46.8 43.9 41 38.1 35.3 | 61 58.9 56.8 54.7 | 53.9 51 48.1 45.3 | 14.5 17.4 20.3 23.2 26.1 29 31.9 34.7 | 10.5 12.7 14.8 16.9 19 21.1 23.2 25.3 |
| AT-83S | 5 6 7 8 9 10 11 12 | 22.2 19 | 15 10.4 | 29.9 26.7 23.6 | 22.7 18.1 13.5 | 37.5 34.3 31.2 28 | 30.3 25.7 21.1 16.5 | 45.2 42 38.9 35.7 32.5 | 38 33.4 28.8 24.2 19.6 | 52.8 49.6 46.5 43.3 40.1 37 | 45.6 41 36.4 31.8 27.2 22.6 | 60.4 57.2 54.1 50.9 47.7 44.6 41.4 | 53.2 48.6 44 39.4 34.8 30.2 25.6 | 64.8 61.7 58.5 55.3 52.2 49 45.8 | 56.2 51.6 47 42.4 37.8 33.2 28.6 | 69.3 66.1 62.9 59.8 56.6 53.4 | 51.6 47 42.4 37.8 33.2 28.6 | 81.4 78.2 75.1 71.9 68.7 | 69.9 65.3 60.7 56.1 51.5 | 93.4 90.4 87.1 83.9 | 80.5 75.9 71.3 66.7 | 23 27.6 32.2 36.8 41.4 46 50.6 55.2 | 15.8 19 22.1 25.3 28.5 31.6 34.8 38 |
| AT-92S | 5 6 7 8 9 10 11 12 | 32.8 28.1 | 21.7 14.9 | 44.1 39.4 34.7 | 33 26.2 19.3 | 55.4 50.7 46 41.4 | 44.3 37.5 30.6 23.7 | 66.6 61.9 57.2 52.6 47.9 | 55.5 48.7 41.8 34.9 28 | 77.9 73.2 68.5 63.9 59.2 54.5 | 66.8 60 53.1 46.2 39.3 32.5 | 89.1 84.4 79.7 75.1 70.4 65.7 61 | 78 71.2 64.3 57.4 50.5 43.7 36.8 | 95.6 90.9 86.3 81.6 76.9 72.2 67.6 | 82.4 75.5 68.6 61.7 54.9 48 41.1 | 102.2 97.6 92.9 88.2 83.5 78.9 | 75.5 68.6 61.7 54.9 48 41.1 | 120.1 115.4 110.7 106 101.4 | 102.4 95.5 88.7 81.8 74.9 | 137.8 133.1 128.4 123.8 | 117.9 111.1 104.2 97.3 | 34.4 41.2 48.1 55 61.9 68.7 75.6 82.5 | 23.3 28 32.7 37.3 42 46.7 51.4 56 |
| AT-105S | 5 6 7 8 9 10 11 12 | 49.7 43.3 | 32.1 22.2 | 66 59.6 53.3 | 48.4 38.5 28.7 | 82.3 75.9 69.6 63.3 | 64.7 54.8 45 35.2 | 98.6 92.2 85.9 79.6 73.3 | 81 71.1 61.3 51.5 41.6 | 114.8 108.4 102.1 95.8 89.5 83.1 | 97.2 87.3 77.5 67.7 57.8 48 | 131.1 124.7 118.4 112.1 105.8 99.4 93.1 | 113.5 103.6 93.8 84 74.1 64.3 54.7 | 141 134.7 128.4 122.1 115.7 109.4 103.1 | 119.9 110.1 100.3 90.4 80.6 71 61 | 150.9 144.6 138.3 131.9 125.6 119.3 | 110.1 100.3 90.4 80.6 71 61 | 177.2 170.9 164.5 158.2 151.9 | 149.1 139.2 129.4 119.8 109.8 | 203.4 197 190.7 184.4 | 171.7 161.9 152.3 142.3 | 49.2 59.1 68.9 78.7 88.6 98.4 108 118 | 31.6 38 44.3 50.6 56.9 63.3 69.3 75.9 |
| AT-125S | 5 6 7 8 9 10 11 12 | 74.8 63.8 | 47.8 32.8 | 100.2 89.2 79.2 | 73.2 58.2 42.2 | 125.6 114.6 104.6 93.6 | 98.6 83.6 67.6 52.6 | 151 140 130 119 109 | 124 109 93 78 62 | 176.3 165.3 155.3 144.3 134.3 123.3 | 149.3 134.3 118.3 103.3 87.3 71.3 | 201.7 190.7 180.7 169.7 159.7 148.7 138.7 | 174.7 159.7 143.7 128.7 112.7 96.7 80.7 | 216.1 206.1 195.1 185.1 174.1 164.1 154.1 | 185.1 169.1 154.1 138.1 122.1 106.1 91.1 | 231.4 220.4 210.4 199.4 189.4 179.4 | 169.1 154.1 138.1 122.1 106.1 91.1 | 271.2 261.2 250.2 240.2 230.2 | 230.2 214.2 198.2 182.2 167.2 | 311.9 300.9 290.9 280.9 | 264.9 248.9 232.9 217.9 | 79 94 110 125 141 157 173 188 | 52 63 73 84 94 105 115 125 |
| AT-140S | 5 6 7 8 9 10 11 12 | 130.9 113.9 | 87.9 61.9 | 174.3 157.3 140.3 | 131.3 105.3 79.3 | 217.7 200.7 183.7 166.7 | 174.7 148.7 122.7 97.7 | 261 244 227 210 192 | 218 192 166 141 115 | 304.4 287.4 270.4 253.4 235.4 218.4 | 261.4 235.4 209.4 184.4 158.4 132.4 | 347.8 330.8 313.8 296.8 278.8 261.8 244.8 | 304.8 278.8 252.8 227.8 201.8 175.8 149.8 | 374.2 357.2 340.2 322.2 305.2 288.2 271.2 | 322.2 296.2 271.2 245.2 219.2 193.2 167.2 | 400.6 383.6 365.6 348.6 331.6 314.6 | 296.2 271.2 245.2 219.2 193.2 167.2 | 470.3 452.3 435.3 418.3 401.3 | 401.3 375.3 349.3 323.3 297.3 | 539.1 522.1 505.1 488.1 | 462.1 436.1 410.1 384.1 | 129 155 181 206 232 258 284 310 | 86 103 120 137 155 172 189 206 |
| AT-160S | 5 6 7 8 9 10 11 12 | 190.5 162.5 | 122.5 80.5 | 256.6 228.6 200.6 | 188.6 146.6 104.6 | 322.7 294.7 266.7 239.7 | 254.7 212.7 170.7 129.7 | 388.8 360.8 332.8 305.8 277.8 | 320.8 278.8 236.8 195.8 153.8 | 454.9 426.9 398.9 371.9 343.9 315.9 | 386.9 344.9 302.9 261.9 219.9 177.9 | 521 493 465 438 410 382 354 | 453 411 369 328 286 244 203 | 559.1 531.1 504.1 476.1 448.1 420.1 392.1 | 477.1 435.1 394.1 352.1 310.1 269.1 227.1 | 597.2 570.2 542.2 514.2 486.2 458.2 | 435.1 394.1 352.1 310.1 269.1 227.1 | 702.4 674.4 646.4 618.4 590.4 | 592.4 550.4 508.4 467.4 425.4 | 806.6 778.6 750.6 722.6 | 682.6 640.6 599.6 557.6 | 208 250 292 333 375 417 458 500 | 140 168 196 223 251 279 307 335 |
| AT-190S | 5 6 7 8 9 10 11 12 | 333 293 | 224 162 | 440 400 360 | 331 269 207 | 546 506 466 426 | 437 375 313 251 | 653 613 573 533 493 | 544 482 420 358 296 | 759 719 679 639 599 559 | 650 588 526 464 402 341 | 866 826 786 746 706 666 626 | 757 695 633 571 509 4448 386 | 933 893 853 813 773 733 693 | 802 740 678 616 555 493 431 | 999 959 919 879 839 799 | 740 678 616 555 493 431 | 1172 1132 1092 1052 1012 | 997 935 874 812 750 | 1346 1306 1266 1226 | 1149 1088 1026 964 | 309 371 433 495 557 618 680 742 | 200 240 280 320 360 400 440 480 |
| AT-210S | 5 6 7 8 9 10 11 12 | 376 321 | 271 195 | 506 451 396 | 401 325 249 | 636 581 526 471 | 531 455 379 303 | 767 712 657 602 547 | 662 586 510 434 358 | 897 842 787 732 677 622 | 792 716 640 564 488 412 | 1027 972 917 862 807 752 697 | 922 546 770 694 618 542 466 | 1102 1047 992 937 882 827 772 | 976 900 824 748 672 596 520 | 1177 1122 1067 1012 957 902 | 900 824 748 672 596 520 | 1383 1328 1273 1218 1163 | 1215 1139 1063 987 911 | 1588 1533 1478 1423 | 1399 1323 1247 1171 | 380 456 532 608 684 760 836 912 | 275 330 385 440 495 550 605 660 |
| AT-240S | 5 6 7 8 9 10 11 12 | 547 465 | 403 292 | 738 656 573 | 594 483 373 | 929 847 764 683 | 785 674 564 453 | 1120 1038 955 874 791 | 976 865 755 644 532 | 1312 1230 1147 1066 983 901 | 1168 1057 947 836 724 614 | 1503 1421 1338 1257 1174 1092 1010 | 1359 1248 1138 1027 915 805 694 | 1612 1529 1448 1365 1283 1201 1119 | 1439 1329 1218 1106 996 885 774 | 1721 1640 1557 1475 1393 1311 | 1329 1218 1106 996 885 774 | 2022 1939 1857 1775 1693 | 1792 1680 1570 1459 1348 | 2322 2240 2158 2076 | 2063 1953 1842 1731 | 554 665 775 886 998 1108 1219 1330 | 410 492 575 565 739 821 903 985 |
| AT-270S | 5 6 7 8 9 10 11 12 | 892 780 | 665 509 | 1183 1071 960 | 956 800 642 | 1473 1361 1250 1138 | 1246 1090 932 775 | 1764 1652 1541 1429 1317 | 1537 1381 1223 1066 908 | 2054 1942 1831 1719 1607 1495 | 1827 1671 1513 1356 1198 1042 | 2345 2233 2122 2010 1898 1786 1674 | 2118 1962 1804 1647 1489 1333 1175 | 2523 2412 2300 2188 2076 1964 1853 | 2252 2094 1937 1779 1623 1465 1308 | 2703 2591 2479 2367 2255 2144 | 2094 1937 1779 1623 1465 1308 | 3172 3060 2948 2836 2725 | 2809 2651 2495 2337 2180 | 3641 3529 3417 3306 | 3232 3076 2918 2761 | 787 943 1101 1258 1416 1572 1730 1887 | 560 672 783 895 1007 1119 1231 1342 |
| AT-300S | 5 6 7 8 9 10 11 12 | 1263 1117 | 932 720 | 1661 1515 1369 | 1330 1118 906 | 2060 1914 1768 1622 | 1729 1517 1305 1093 | 2458 2312 2166 2020 1874 | 2127 1915 1703 1491 1279 | 2857 2711 2565 2419 2273 2127 | 2526 2314 2102 1890 1678 1465 | 3255 3109 2963 2817 2671 2525 2379 | 2924 2712 2500 2280 2076 1863 1651 | 3508 3362 3216 3070 2924 2778 2632 | 3111 2899 2687 2475 2262 2050 1838 | 3760 3614 3468 3322 3176 3030 | 2899 2687 2475 2262 2050 1838 | 4411 4265 4119 3973 3827 | 3882 3670 3457 3245 3033 | 5062 4916 4770 4624 | 4467 4254 4042 3830 | 1061 1273 1485 1697 1909 2122 2334 2546 | 730 876 1022 1168 1314 1460 1606 1752 |
