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Rack and Pinion Actuator

A pneumatic rack and pinion actuator is a type of device used in industrial automation and control systems to convert the linear motion of compressed air into rotary motion. This actuator is commonly employed to control valves in various applications, such as in the oil and gas industry, chemical processing plants, water treatment facilities, and other industrial settings.

Here's a brief explanation of the key components and working principle of a pneumatic rack and pinion actuator:

Rack and Pinion Mechanism:

  • Rack:

    The rack is a linear gear with teeth cut into its surface. It typically moves back and forth linearly.

  • Pinion :

    The pinion is a small gear that engages with the teeth of the rack. When the pinion rotates, it causes the rack to move linearly.

  • Actuator Body :

    The actuator body houses the rack and pinion mechanism, providing support and alignment for the components.

  • Pneumatic Cylinder

    The pneumatic cylinder is a crucial part of the actuator. It contains a piston that moves back and forth inside the cylinder when compressed air is introduced. The movement of the piston is what drives the rack and pinion mechanism

  • Compressed Air Inlet/Outlet

    Compressed air is supplied to the pneumatic cylinder through an inlet. The outlet allows the air to be exhausted

  • Directional Control Valve

    A directional control valve is used to control the flow of compressed air to the pneumatic cylinder. By manipulating the valve, operators can control the direction of movement of the actuator (extend or retract).

Working Principle:

  • Extension

    When compressed air is directed to one side of the piston inside the pneumatic cylinder, it pushes the piston, causing the rack and pinion mechanism to move linearly. This linear motion is then converted into rotary motion, rotating the output shaft of the actuator

  • Retraction

    When compressed air is directed to the other side of the piston, it pulls the piston back, reversing the linear motion of the rack and pinion mechanism and causing the output shaft to rotate in the opposite direction.

  • Pneumatic rack and pinion actuators are known for their simplicity, reliability, and quick response time. They are commonly used in applications where a fast and efficient valve control is required.

PERFORMANCE FEATURE
Indicator : The indicator confirms to VID/VIE3845 namur standard, which is convenient for installing limit switch, positioned and other accessories
Output Shaft : The design of the one-body forging and pressing output shaft of nickel-plated alloy steel is in accordance with NAMUR, ISO5211 and DIN3337 standard. Special standards can be customized accordin to the customer.
Cylinder Block : It is made of high quality aluminium alloy extrusion, the surface is coated with hard anodic oxidation and Teflon coating.
End Cover : Aluminium alloy die casting, surface with anodic hardening treatment and metal polyester coating.
Piston : Cast aluminum with hard oxidation.
Oper. Temp. Range : -20°C to 80°C For Nitrile Seat (Depending On MOC)
Seat Leakege : Tight Shut Off
Adjustment Bolt : Two independent adjustment bolts realize accurate adjustment within ±5O of the angle of the valve opening and closing.
Piston Ring : Use low friction and long life composite material, convenient reapir and replace.
Seal : Use nitrile rubber under normal temperature, special seal is available according to the customer’s requirement for high temperature and low temperature.
Air connection : It complies with NAMUR standard and can be direcly mounted with NAMUR standard solenoid valve.
Fastners : All fastner are made of stainless steel.
Output torque (double acting)
Actuator model 2.0 bar 2.5bar 3.0bar 4.0bar 4.5bar 5.0bar 5.5bar 6.0bar 7.0bar 8.0bar
PT052D 8 10 12 16 18 20 22 24 28 32
PT063D 15 18 22 29 33 36 40 44 51 58
PT075D 20 25 30 40 45 50 55 60 70 80
PT083D 31 39 47 63 70 78 86 94 111 125
PT092D 45 56 68 90 102 113 124 135 158 181
PT105D 66 83 99 132 149 165 182 198 231 264
PT125D 100 125 150 200 226 251 276 301 351 401
PT140D 171 214 256 342 385 427 470 513 598 684
PT160D 266 332 399 532 598 665 731 798 931 1064
PT190D 420 532 638 851 958 1064 1170 1277 1490 1702
PT210D 532 665 798 1064 1197 1330 1463 1596 1862 2128
PT240D 769 962 1154 1539 1731 1924 2116 2308 2693 3078
PT270D 1170 1462 1450 2339 2632 2924 3216 3509 4094 4679
PT300D 1526 1908 2289 3052 3434 3815 4197 4578 5341 6104
PT350D 2285 2856 3427 4570 5141 5712 6283 6854 7997 9139
PT400D 3256 4070 4884 6512 7326 8140 8954 9768 11396 13024
SINGLE ACTING OUT PUT TORQUE (SPRING RETURN)(NM)
Actuator
MODEL 		SPRING
QUANTITY 		4.0 BAR 5.0 BAR 6.0 BAR 7.0BAR 8.0BAR SPRING RETURN TORQUE
0°
START 		90°
END 		0°
START 		90°
END 		0°
START 		90°
END 		0°
START 		90°
END 		0°
START 		90°
END 		0°
START 		90°
END
PT052S 10 7.4 3.6 11.5 6.7 15.5 11.6 19.5 15.6 / / 12.4 8.5
PT063S 10 1.4 8.2 22.8 15.6 30 22.8 37.3 30.1 44.7 37.4 20.9 13.7
PT075S 10 19 11.1 28.8 21.2 39 31.2 49.1 41.2 59.1 51.2 29 21.1
PT083S 10 31 16.6 46.7 32.3 62.4 48 78.1 63.7 93.8 79.3 46 31.6
PT092S 10 43.6 21.5 66.2 44.1 88.8 66.7 111.3 89.2 134 11.8 68.7 46.7
PT105S 10 68.9 33.4 102 66.5 135.1 99.6 161.8 123.1 201.2 165.7 98.4 63.3
PT125S 10 96 44 146 94 196 144 247 194 297 245 157 105
PT140S 10 170 84 256 169 314 255 427 340 512 426 258 172
PT160S 10 253 115 386 248 519 381 652 514 785 647 417 279
PT190S 10 451 233 664 446 877 658 1090 871 1302 1084 618 400
PT210S 10 514 304 780 570 1046 836 1312 1102 1578 1368 760 550
PT240S 10 718 431 1103 816 1488 1201 1872 1586 2257 1970 1108 821
PT270S 10 1220 767 1805 1352 2390 1937 2974 2521 3560 3107 1572 1119
PT300S 10 1430 695 2355 1693 2956 2221 3719 2984 4482 3747 2122 1460
PT350S 10 1963 787 3105 1929 4247 3071 5390 4214 6532 5356 3405 2346
PT400S 10 3012 1025 4640 2653 6268 4281 7895 5908 9523 7536 4938 3149
COMPONENTS MATERIAL
SR.NO. NAME QTY OF
EACH UNIT 		STANDARD MATERIAL MATERIAL OF
SELECTABLE
1 Left cover 1 Aluminium Die Casting -
2 “O” ring (cover) 2 NBR FPM/Q
3 Piston Ring 2 POM -
4 “O” ring (Piston) 2 NBR FPM/Q
5 Piston 2 Aluminium Die Casting -
6 Bolt 1 ABS -
7 Main body of the Indicator 1 ABS -
8 Shaft Ring 1 Stainless Steel -
9 Gasket 1 POM -
10 Block 1 Aluminum Extrusion -
11 Guide Ring 1 PA66 -
12 Right Cover 1 Aluminium Die Casting -
13 End Cover Bolt 8 Stainless Steel -
14 “O” ring (Adjustable bolt) 2 NBR FPM/Q
15 Gasket 2 Stainless Steel -
16 Nut 2 Stainless Steel -
17 Adjustment Bolt 2 Stainless Steel -
18 “O” Ring (at the top of the shaft) 1 NBR -
19 Bearing (at the top of the shaft) 1 POM -
20 Gasket 1 POM -
21 Adjustment Cam 1 Carbonsteel -
22 Output Shaft 1 Carbonsteel -
23 Bearing (Output shaft bottom) 1 POM -
24 “O” ring (output shaft bottom) 1 NBR FPM/Q
DIMENSION AND CONNECTION IN MM
Model PT052 PT063 PT075 PT083 PT092 PT105 PT125 PT140 PT160 PT190 PT210 PT240 PT270 PT300 PT350 PT400
ISO
FLANGE 		F03/F05 F05/F07 F05/F07 F05/F07 F05/F10 F05/F10 F05/F10 F05/F12 F05/F12 F14 F14 F16 F16 F16 F16/25 F16/25
A 154 176 188 211 244 277 310 394 458 523 526 602 718 760 920 940
B 73 89 101 110 118 135 157 175 198 232 257 289 326 350 410 466
C 25 25 25 25 25 25 39 39 39 39 39 30 30 30 30 30
E 13 17 17 20 20 25 27 30 30 38 38 50 50 50 50 50
F 41 47 53 57 60 64 75 75 86 103 130 147 174 195 260 113
G 30 36 43 47 50 58 67 75 86 103 113 130 147 162 190 260
L 80 80 80 80 80 80 80 130 130 130 130 130 130 130 130 130
M 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
N 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9
0 50 - - - - - - - - - - - - - - -
P 4-M6X9 4-M8X12 4-M8X12 4-M8X12 4-M10X15 4-M10X15 4-M10X15 4-M12X18 4-M12X18 4-M16X24 4-M16X24 4-M16X25 4-M16X25 4-M16X25 8-M16X24 8-M16X24
01 36 50 50 50 70 70 70 102 102 - - - - - - -
P1 4-M5X8 4-M6X9 4-M6X9 4-M6X9 4-M8X12 4-M8X12 4-M8X12 4-M10X15 4-M10X15 - - - - - 4-M20X25 4-M20X25
Q 11 14 14 17 17 22 22 27 27 36 36 46 46 46 46 46
V 24 24 24 24 24 24 24 24 24 24 24 24 40 40 40 40
W 36 36 36 36 36 36 36 36 36 36 36 36 45 45 45 45
Y 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M5X9 4-M6X10 4-M6X10 4-M6X10 4-M6X10
Z G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/4” G1/2” G1/2” G1/2” G1/2”

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