- Jan 19, 2019
- Leamington Spa, UK
- Real Name
Fascinating - the world runs on stuff that 99% of the general population have absolutely no conception of!Thanks Paul.
We describe them to people as "something you use everyday, but have no idea it even exists...".
They are "Quarter turn" (90 degree) pneumatic actuators with electro-pneumatic positioners mounted on top of them.
The actuator is the "clam shell shaped item" beneath the rectangular shaped box on top.
The positioner is the rectanglar shaped boxes on top of the actuators. There are two variants of positioners shown. The positioner controls how far open or closed the valve is based on a variable control (input) signal. It's analogous to a "throttle" for the valve and controls the flowrate passing through the valve.
These assemblies are typically used to control valves (ball valves, butterfly valves, plug valves, etc.). The valves may control the water that feeds you home or business. The could manage the flow of waste (sewage) that leaves your house. The may control the flow of fuel in pipe lines, chemicals in manufacturing processes, or any other liquid or gas that flows through a pipe for any reason.
While the "primary" application for these devices is control of valves, there are numerous other applications. They are used to control damper drives. They are used on conveyor systems to operate divertor gates, they are used to open & close pneumatic doors on busses, they are used for waste gate control on large diesel engines, and on, and on...
One of the coolest application is precise controls in rockets (i.e. Space-X).
The pictured units are comparatively small. The models shown are slightly smaller than a basketball.
The ones shown here produce 850 in/lbs of torque, when supplied 80 PSI of air pressure.
The range is 6 in/lbs on the small end (used in soda fountains and other small applications) up to 284,000 in/lbs on the big end, with even larger models currently in design.