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BHA Series
The BHA Series Rack and Pinion Pneumatic Actuator is a high-performance industrial driving device engineered by Yangzhou Hengchun Electronics Co., Ltd., a leading China manufacturer of valve actuators. This actuator leverages compressed air to drive double pistons for linear motion, with the precision rack integrated on the pistons meshing with the output shaft gear to efficiently convert linear motion into accurate rotary (angular stroke) motion. Classified into double-acting and single-acting types, it is a staple for standardized, high-torque, and high-reliability angular stroke drive, ideally suited for 90°/180° on-off control of valves, air dampers and industrial dampers, even under harsh working conditions. The single-acting variant is specially designed for emergency shut-off working conditions, delivering critical safety performance.
At a standard 0.6MPa (6Bar) air pressure, the actuator delivers output torque/thrust no less than the marked value without permanent deformation. With torque ranging from 12.2N.m to 13024N.m for double-acting models across different specifications, meeting diverse industrial load demands.
It operates stably under an ambient temperature of -40℃ to 70℃ and an air pressure range of 0.4MPa-0.7MPa. Adapting to extreme industrial environments with strict air supply requirements (clean, dry air free of corrosive gas/liquid).
Constructed with high-quality materials, the actuator achieves a service life of ≥50,000 opening-closing cycles under rated load. With no jamming or crawling during low-pressure air input, ensuring long-term continuous operation.
Parameters | Description |
Operating Pressure | 0.4MPa - 0.7MPa |
Ambient Temperature | -40℃ - 70℃ |
Air Supply Requirement | Clean and dry air, free of corrosive gas or liquid |
Connection Standard | Compliant with GB/T 12222 (Multi-turn) and GB/T 12223 (Part-turn) |
Air Port Thread | Compliant with GB/T 7306.1/2 and other standards |
Structural Composition | Cylinder, opening indicator, stroke limit, manual mechanism, signal feedback, etc. |
Manual Operation | Manual operation available when air supply is interrupted; counterclockwise to open the valve, clockwise to close the valve |
Action Mode | Double-acting (D), spring return air-to-open (O), spring return air-to-close (C) |
Output Performance | At 0.6MPa air pressure, output torque/thrust ≥ marked value, no permanent deformation |
Sealing Performance | Back pressure side leakage ≤ (3+0.15D)cm³/min (D = cylinder bore, mm); shaft end leakage ≤ (3+0.15d)cm³/min (d = shaft diameter, mm) |
Strength Requirement | Pressure holding for 3 minutes at 1.5 times the maximum operating pressure, no leakage or deformation |
Service Life | ≥50,000 opening-closing cycles under rated load |
Buffer Mechanism | Stroke length graded by cylinder bore; adjustable buffer requires external adjustment |
Key Materials | Aluminum alloy/seamless steel pipe for cylinder; 45# steel with chrome plating for piston rod; PTFE and other materials for seals |
No-Load Test | No jamming or crawling when inputting low-pressure air (0.03MPa for single-acting cylinder, 0.06MPa for double-acting cylinder) |
Load Test | Measured output torque/thrust ≥ marked value at 0.6MPa |
Strength Test | Pressure holding for 3 minutes at 1.5 times the maximum pressure (Medium: oil or air) |
Sealing Test | Pressure holding for 3 minutes at 1.1 times the maximum pressure, measure leakage or no pressure drop for 5 minutes |
Output Torque Table for the BHA series rack-and-pinion pneumatic actuator（Double-Acting） | ||||||
model | Air Supply Pressure (Unit: Bar) 2、How does a pneumatic actuator work? 3、What’s the difference between single-acting and double-acting pneumatic actuators? | |||||
3 | 4 | 5 | 6 | 7 | 8 | |
out torque（N.m） | ||||||
52 | 12.2 | 16.2 | 20.3 | 24.3 | 28.4 | 32.4 |
63 | 21.3 | 28.4 | 35.5 | 42.6 | 49.7 | 56.8 |
75 | 30.2 | 40.2 | 50.3 | 60.3 | 70.4 | 80.4 |
83 | 46.2 | 61.6 | 77 | 92.4 | 107.8 | 123.2 |
92 | 68.1 | 90.8 | 113.5 | 136.2 | 158.9 | 181.6 |
105 | 99 | 132 | 165 | 197 | 230 | 263 |
125 | 155 | 206 | 258 | 309 | 361 | 412 |
140 | 263 | 350 | 438 | 525 | 613 | 700 |
160 | 401 | 534 | 668 | 801 | 935 | 1068 |
190 | 647 | 862 | 1078 | 1293 | 1509 | 1724 |
210 | 789 | 1052 | 1315 | 1578 | 1841 | 2104 |
240 | 1160 | 1546 | 1933 | 2319 | 2706 | 3092 |
270 | 1761 | 2348 | 2935 | 3522 | 4109 | 4696 |
300 | 2289 | 3052 | 3815 | 4578 | 5341 | 6104 |
350 | 3428 | 4570 | 5713 | 6855 | 7998 | 9140 |
400 | 4884 | 6512 | 8140 | 9768 | 11396 | 13024 |
Output Torque Table for the BHA series rack-and-pinion pneumatic actuator(Single-Acting) | ||||||
model | Number of springs | Air Supply Pressure (Unit: Bar) | ||||
3 | 4 | 5 | ||||
0ºout torque | 90ºout torque | 0ºout torque | 90ºout torque | 0ºout torque | ||
63 | 6 | 13.1 | 8.8 | 20.2 | 15.9 | 27.3 |
8 | 10.4 | 4.6 | 17.5 | 11.7 | 24.6 | |
10 | 14.7 | 7.5 | 21.8 | |||
12 | 19.1 | |||||
75 | 6 | 17.5 | 12.8 | 27.5 | 22.8 | 37.6 |
8 | 13.3 | 7 | 23.3 | 17 | 33.4 | |
10 | 19.1 | 11.1 | 29.2 | |||
12 | 25 | |||||
83 | 6 | 27.2 | 18.6 | 42.6 | 34 | 58 |
8 | 20.9 | 9.4 | 36.3 | 24.8 | 51.7 | |
10 | 30 | 15.6 | 45.4 | |||
12 | 39 | |||||
92 | 6 | 40.1 | 27.1 | 62.8 | 49.8 | 85.5 |
8 | 31.1 | 13.1 | 53.8 | 35.8 | 76.5 | |
10 | 44.8 | 22.8 | 67.5 | |||
12 | 57.5 | |||||
105 | 6 | 60.7 | 39.7 | 93.6 | 72.6 | 126.5 |
8 | 48.7 | 20.7 | 81.6 | 53.6 | 114.5 | |
10 | 68.6 | 33.6 | 101.5 | |||
12 | 89.5 | |||||
125 | 6 | 92.5 | 60.5 | 144 | 112 | 195.5 |
8 | 71.5 | 29.5 | 123 | 81 | 174.5 | |
10 | 102 | 50 | 153.5 | |||
12 | 132.5 | |||||
140 | 6 | 160.5 | 108.5 | 248 | 196 | 335.5 |
8 | 125.5 | 2.5 | 213 | 90 | 300.5 | |
10 | 179 | 93 | 266.5 | |||
12 | 232.5 | |||||
160 | 6 | 232.5 | 150.5 | 366 | 284 | 499.5 |
8 | 177.5 | 67.5 | 311 | 201 | 444.5 | |
10 | 255 | 117 | 388.5 | |||
12 | 332.5 | |||||
190 | 6 | 419.5 | 294.5 | 635 | 510 | 850.5 |
8 | 343.5 | 177.5 | 559 | 393 | 774.5 | |
10 | 483 | 276 | 698.5 | |||
12 | 622.5 | |||||
210 | 6 | 476 | 357 | 739 | 620 | 1002 |
8 | 372 | 214 | 635 | 477 | 898 | |
10 | 531 | 333 | 794 | |||
12 | 690 | |||||
240 | 6 | 692.5 | 529.5 | 1079 | 916 | 1465.5 |
8 | 534.5 | 319.5 | 921 | 706 | 1307.5 | |
10 | 768 | 496 | 1154.5 | |||
12 | 999.5 | |||||
270 | 6 | 1125 | 867 | 1712 | 1454 | 2299 |
8 | 913 | 569 | 1500 | 1156 | 2087 | |
10 | 1288 | 858 | 1875 | |||
12 | 1663 | |||||
300 | 6 | 1413 | 1016 | 2176 | 1779 | 2939 |
8 | 1121 | 592 | 1884 | 1355 | 2647 | |
10 | 1592 | 930 | 2355 | |||
12 | 2063 | |||||
350 | 6 | 2019.5 | 1384.5 | 3162 | 2527 | 4304.5 |
8 | 1540.5 | 703.5 | 2683 | 1846 | 3825.5 | |
10 | 2224 | 1165 | 3366.5 | |||
12 | 2896.5 | |||||
400 | 8 | 2784 | 1592 | 4412 | 3220 | 6040 |
10 | 2260 | 769 | 3888 | 2397 | 5516 | |
12 | 3363 | 1574 | 4991 | |||
Hengchun adheres to strict quality control for the BHA Series Rack and Pinion Pneumatic Actuator, with all units undergoing a full set of rigorous tests before delivery: No-Load Test (low-pressure air input without jamming), Load Test (torque/thrust meets marked value at 0.6MPa), Strength Test (3-minute pressure holding at 1.5×max operating pressure, no leakage/deformation) and Sealing Test (3-minute pressure holding at 1.1×max operating pressure, no abnormal leakage). The actuator complies with Chinese national standards and the manufacturer’s ISO certification, ensuring consistent quality and reliable performance for industrial applications.
The primary use for the rack and pinion pneumatic actuator is driving ball valves and butterfly valves in the oil & gas, power generation, and water treatment industries, the three core sectors Hengchun serves, realizing precise on-off control of fluid pipelines.
It is widely applied to control air dampers in ventilation systems and industrial dampers in heavy manufacturing, with stable angular stroke motion ensuring accurate flow and air volume regulation.
Its robust structural design and wide temperature adaptability make it suitable for outdoor, high-humidity, and low-temperature industrial working conditions, such as offshore oil platforms and outdoor power plants.
The standard operating air supply pressure is 4 to 7 Bar (0.4MPa-0.7MPa), and the actuator can also work with a maximum 8 Bar air pressure for higher torque output (see the official output torque table for details).
It uses compressed air to drive double pistons for linear motion; the precision rack on the pistons meshes with the output shaft gear, converting linear motion into rotary angular stroke motion to drive valves and dampers for on-off control.
Double-acting actuators rely on compressed air for both opening and closing actions, while single-acting actuators use compressed air for one action (open/close) and a spring for the return action. Single-acting models are specifically used for emergency shut-off working conditions, while double-acting ones are for regular continuous on-off control.
