Model name
① |
A series - Scotch yoke R series - Rack & pinion |
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② |
D-Double acting S-Spring return |
③ | Internal diameter |
AD | 50/65/80/100/125/140/160/185/210/250/300 |
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AS | 50/65/80/100/125/140/160/185/210/250/300 |
RD | 32/40/50/65/80/90/100/115/125/140/160/185/210 |
RS | 32/40/50/65/80/90/100/115/125/140/160/185/210 |
Model code
ⓐ | ⓑ | ⓒ | ⓓ | ⓔ | ⓕ |
---|---|---|---|---|---|
Mechanism | Diameter | O-RING | SPRING | Action | Body color |
A : scotch yoke R : rack pinion |
3 : 32 (Only R series) 4 : 40(R) 5 : 50 6 : 65 8 : 80 9 : 90 10 : 100 11 : 115(R) 12 : 125 14 : 140 16 : 160 18 : 185 21 : 210 25 : 250(A) 30 : 300(A) |
N : NBR V : VITON E : EPDM |
D : Double acting W : Weak spring M : Middle spring S : Strong spring No. : R's spring q'ty O : OB Spring for detail |
A : Action A     (Fail closed) B : Action B     (Fail open) C : Action C D : Action D Action for detail |
K : Black L : Blue W : White Y : Yellow M : Mint O : OB |
ⓖ | ⓗ | ⓘ | ⓙ | ⓚ | |
Cover color | Indicator | ISO5211 | STEM | OPTION | |
K : Black L : Blue W : White Y : Yellow R : Red O : OB |
A : A type B : B type C : C type D : D type Indicator for detail |
3 : F03 4 : F04 5 : F05 7 : F07 10 : F10 12 : F12 14 : F14 16 : F16 25 : F25 O : OB |
C9 : 9*9 C11:11*11 C14:14*14 C17:17*17 C19:19*19 C22:22*22 C27:27*27 C36:36*36 C46:46*46 C55:55*55 O:OB |
T4 : PT1/4 T8 : PT3/8 T2 : PT1/2 N4 : NPT1/4 N8 : NPT3/8 N2 : NPT1/2 HW : Hand wheel SE1 : Stopper end cap         (one side) O-45 : Open -45˚          (Center stopper) C-45 : Close -45˚          (Center stopper) |
* OB: Order based
Scotch yoke / Rack&pinion
  | Scotch-yoke | Rack&Pinion | ||
---|---|---|---|---|
Operational principle |
Upon air supply, pistons move horizontally, turning the shaft by the arm connected to the pistons. |
Upon air supply, pistons move horizontally, turning the shaft that is linked to the piston gear. |
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Major parts | piston / crank / shaft | piston / shaft | ||
Benefits |
- Smooth on/off with the    torque curve    synchronized with    valves. - Relatively higher torque    than the same model    inRack&Pinion type. |
- Short body length makes it easier to fit in    small spaces. - The multi-spring structure enables adjustment    of number of springs to suit the site    requirements. |
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Weakness |
- long length due to the piston stroke. - Multi-spring disabled and therefore a jig is    required fo00r spring adjustment. |
- Rigid torque. - It requires the bigger    cylinder inner-dia    to achieve the same    torque as the    Scotch-yoke type. |
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Misc | - Due to high torque in large models,    Scotch-yoke types are commonly used. |
- Due to short piston stroke in compact models,    Rack&Pinion types are commonly used. |
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- In order to ensure that each part withstands    high torque, design works and durability tests    must be carefully conducted. |
- Gears being the media connecting pistons to    shafts, their quality affect the actuator’s    performance directly. High precision gear    design technique is therefore essential. |
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Torque (Nm at 5Bar) |
AD50 ; 37-26-40 | RD50 ; 17.1 |