Showing posts with label actuation. Show all posts
Showing posts with label actuation. Show all posts

Monday, April 27, 2020

New Product Line: Max-Air Technology Valve Actuators and Controls

Piping Specialties / PSI Controls is please to introduce Max-Air Technology to its family of products.

Max-Air’s full line of pneumatic control products – including their industry recognized rack and pinion actuators – provide cost-effective solutions for simple on/off control or more complicated flow requirements such as diverting or multi-port applications. Their patented adjustable dual travel stops provide the greatest degree of control in the industry at ±10 degrees on each end of the stroke. To complement their actuators, they have a complete range of control accessories including solenoid valves, limit switches, positioners, and a wide assortment of automation hardware. In addition, Max-Air offers best-in-class assembly services and turn-key automation packages to minimize installation time and simplify project sourcing.

Learn more and download the Max-Air Product Portfolio from this link.

For more information, contact Piping Specialties. Call us at 800-223-1468 or visit out website at https://psi-team.com.

Thursday, January 9, 2020

Piping Specialties Valve Automation Services


By combining years of experience with the industries top manufacturers of valves, valve actuators, and controls, Piping Specialties has established itself as one of New England's premier valve automation centers. When it comes to design, fabrication, assembly and installation of any valve actuation/automation project, PSI's application experience, engineering know-how, and highly trained technicians makes them an easy choice to be your preferred valve automation partner.

For more information visit https://psi-team.com or call 800-223-1468.

Saturday, February 23, 2019

Types of Pneumatic Valve Actuators

Scotch-yoke actuators
Scotch-yoke actuators (Morin)
Pneumatic valve actuators all provide the same function:  They convert air pressure to rotational

movement and are designed to open, close, or position a quarter-turn valve.  These include ball valves, plug valves, butterfly valves, or other types of 90 degree rotational valves.

The basic design variations of pneumatic valve actuators are as follows:

  • Rack and pinion
  • Scotch-yoke
  • Rotary vane

Let's review each of these in detail:

Rack and Pinion Actuators

Rack and pinion actuator
Rack and pinion actuator (Unitorq)
These actuators are sometimes referred to as, “lunch box,” because they, well, look like a lunch box. This actuator uses opposing pistons with integral gears to engage a pinion gear shaft to produce rotation. They are usually more compressed than a scotch yoke, have standardized mounting patterns, and produce output torques suitable for small-to-medium sized valves.  Rack and pinion nearly always include standard bolting and coupling patterns to directly attach a valve, solenoid, limit switch or positioner.  One of their features include several smaller coil springs mounted internally, which provide the torque to return the valve to its starting position.

Scotch-yoke Actuators 

Scotch-yoke actuators
Scotch-yoke actuators internal view.
These actuators come in a multitude of sizes, but are usually used on larger valves because they can produce a very high torque output.  They employ a pneumatic piston mechanism to transfer movement to a linear push rod.  That rod, in turn, engages a pivoting lever arm to provide rotation. Spring return units have a large return spring module mounted on the opposite end of the piston mechanism working directly against the pressurized cylinder.

Rotary Vane Actuators 

Rotary vane actuators
Rotary vane actuator animation.
These actuators are usually used when the application requires a significant space savings.  They take up less space when comparing size-to-torque with rack and pinion and scotch yoke. Rotary van actuators also benefit from a reputation of longevity.  They contain fewer moving parts than other types of pneumatic valve actuators.  Rotary vane actuators use externally mounted, helically wound "clock springs" for their spring return mechanism.

These style of valve actuators can all be secured with direct acting or spring return versions. Direct acting actuators use the air supply to move the actuator in both directs (open and close). Spring return actuators, as the name describes, uses springs to move the actuator back to its "resting" state. Converting a version from direct acting to spring return is done through simple modifications, typically just adding an external spring module, or removing the end caps from rack and pinion actuators and installing several coil springs.

When considering the choice of pneumatic valve actuators, your decision comes down to size, power, torque curve and the ease of adding peripherals. To ensure that your valve actuation package will be optimized for safety, longevity, and performance, the advice of a qualified valve automation expert should be sought out. That expert will be able to help you with the best selection of the appropriate valve actuator for any quarter turn valve application.

For more information on valve actuation, contact Piping Specialties, Inc.
https://psi-team.com
800-223-1468