KOSA+’ Pneumatic Actuator, the best solution for P.O.V*!
P.O.V-Pneumatic cylinder Operated Valve actuator.
It is called the ‘Air Actuator’, ‘Cylinder Actuator’, or ‘Pneumatic Actuator ’.
Though it is also used in some of the linear slide valves, it is mostly used in the automation of quarter turn valves.
(ball valve, plug valve, butterfly valve, damper valve and etc.) which rotate 90°.
Usable under the low/high temperature or vibration environment as it is not susceptible to operation environment.
Very stable under the explosive environment as it does not use electricity.
Usable in ESV (Emergency Shut-off Valve) also as the response time is very fast compared to MOV* or AOV*.
* MOV (Motor Operated Valve actuator)
* AOV (Air motor Operated Valve actuator)
In Scotch-yoke and Rack & Pinion types.
Model name
| ① | A series – Scotch yoke R series – Rack & pinion |
|---|---|
| ② | D-Double acting S-Spring return |
| ③ | Internal diameter |
| AD | 50/65/80/100/125/140/160/185/210/250/300 |
|---|---|
| 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.
| ||
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. | |
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. |
| |
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. | ||
– 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. | |||
Torque (Nm at 5Bar) | AD50 ; 37-26-40 | RD50 ; 17.1 | ||