|
Pneumatic actuators are required to operate in a wide variety of applications; they have to function first time every time, often under very difficult circumstances. One actuator may perform hundreds of cycles 24 hours a day, whereas another may open and close just once a month, but still be ready to shut down instantly on a failure signal.
|
|
| Optimum Performance
|
|
|
 We realise that the performance of our pneumatic actuators is vitally important to your production process. An actuator that does not function well often has serious consequences for the outcome of the process. That is why quality has been our primary concept in actuator development. El-O-Matic pneumatic actuators are reliable, quality products, continuously providing optimum performance under all circumstances.
|
|
| Features
|
|
- For application to ball, plug and butterfly valves.
- Can be used in other quarter-turn applications, such as dampers and pressure regulators.
- Actuators are made of high duty Aluminium alloys, providing optimum strength and corrosion resistance.
- Compact rack & pinion design.
- Can be supplied in single (spring return) or double acting versions.
- Choice from twelve sizes models, with a torque range from 12 to 4000 Nm (106 to 35400 lbf.in.).
- Mounting for solenoid valves and position signallers to the NAMUR standard (VDI/VDE 3845).
- Valve mounting and drive dimensions to the ISO 5211 or DIN 3337.
- Drive shaft provided with insert, for low cost, versatile direct valve mountings.
- Anti-blow-out shaft.
|
|
|
Back To Top |
|
| Operating Principle
|
|
 Pneumatic actuators come in two versions: double acting and single acting (spring return). Both versions are designed in such a way that (with the exception of the position indicator) there are no moving parts on the outside. This makes them safe, easy to install and virtually maintenance free. Furthermore, the compact rack and pinion construction means that actuators are lightweight and occupy a minimum of space. |
|
| Ample Choice Of Spring Packages
|
|
Spring return, single acting actuators are used in most safety systems. Their ability to automatically return the valve to its fail-safe position on air failure provides the vital link for ultimate system shut down. El-O-Matic spring return actuators have modular spring packages, which enable them to be easily applied to a wide variety of supply pressures and operating conditions.
|
|
| Standard Specification
|
|
- Pressure 0.2 to 10 bar (3 to 145 PSI)
- Temperature -20°C to +80°C (-4°F to +176°F)
- Materials Housing:
- Aluminium alloy
- Shaft: Hard anodised aluminium alloy
- Finish 2-component polyurethane
- Lifespan Minimum of 500,000 cycles
|
|
| Limit Stops
|
|
Limit stops are necessary where the precise adjustment of the valve’s open position is required. These are standard on all actuators up to 1600 Nm. and optional on the two larger sizes. Actuators with double stroke adjustment are also available for those applications on high performance butterfly valves (closed position).
|
|
| Standardisation
|
|
El-O-Matic actuators comply fully with all the relevant industry standards. Control interfaces for solenoid valves, switch boxes and positioners satisfy the NAMUR standard (VDI/VDE 3845). Valve mounting and drive dimensions are to ISO 5211 standard (option DIN 3337). |
|
Back To Top |
|
| Inserts
|
|
 Actuator sizes up to 1600 Nm. (14160 lbf.in.) are fitted with drive inserts. This enables actuators to be directly mounted onto suitable valves and eliminates the need for a bracket and coupling type mounting kit. The increasing use of direct mounts significantly cuts the cost of the valve/actuator assembly. Standard actuators are fitted with square drive inserts in accordance with ISO 5211 (or DIN 3337), but a wide variety of other inserts are also available. Special inserts may have oversize or undersize squares, or with double-D or shaft key way forms. These can be supplied on factory built actuators or as loose items, drive inserts are easily replaceable at distributor or end user level.
Where direct mounts are not possible, for instance on valves with exposed grand packing, the use of inserts often simplifies the design of the mounting kit.
|
|
| Long Life Span
|
|
El-O-Matic actuators have a patented 3-point guiding system, full synthetic bearings and a rack & pinion gearing. High precision gear cutting methods provide close tolerances and ensure minimum gear backlash, all of which guarantees virtually the longest working life of any actuator in the industry.
|
|
| Application
|
The choice of actuator depends primarily on the valves’ torque requirement, and with El-O-Matic you have the widest range possible, 12 basic model sizes covering a torque range from 12 to 4000 Nm. (106 to 35400 lbf.in.).
But for optimum actuator sizing many factors may need consideration. El-O-Matic has all available relevant technical data on practically all the quarter-turn valve manufacturers in the world. This electronic database enables us to select just the right actuator for you, whatever the valve type: ball, butterfly or plug valve. |
| Special Versions
|
|
In addition to the standard pneumatic actuators, the following special versions can be supplied.
- Actuators with steel housing.
- 180° actuators (half turn rather than quarter turn).
- 3-position actuators for 3-way valves.
- 3-position actuators with “fail-mid” control. Air failure returns the valve to its mid position.
- 3-position actuators with pneumatically adjustable mid position.
- Actuators with hydraulic speed control, for very slow operating speeds.
|
| Special actuators can be built to suit a wide variety of extreme applications: high temperature, low temperature, offshore, fire safe, nuclear industry, with different operating media, etc.
Ask our technical specialists for more information about these special applications.
|
3-Position actuator with fail-mid control
|
Actuator with hydraulic speed control
|
3-position actuator with adjustable mid position
|
|
Back To Top |
|
| Downloads
|
|
|
|
