Thursday, December 25, 2014

Happy Holidays from ROTEX USA

ROTEX USA would like to wish everyone a very happy and safe Holiday Season and a prosperous New Year. Thank you for all of your support and we look forward to growing with you in  the upcoming year.

Wednesday, November 12, 2014

Intro to ROTEX Solenoids, Valve Actuators and Limit Switches

Introduction of ROTEX Controls product line of solenoid valves, Infinity ECV line of rack and pinion actuators, DRS and DRV scotch yoke actuators, and HYV hydraulic actuators and limits switches.

ROTEX offers a range of Solenoid Valves and Air Operated Valves used for handling almost any fluid with various of temperature, pressure or vacuum for use in Control and Automation applications.

ROTEX limit switches are designed to last and meet your required service conditions. Both the weather proof and explosion proof switches feature an aluminum die cast enclosure that is powder coated for superior corrosion resistance resulting in a weather proof enclosure to IP67. Stainless steel enclosures are available, also confirming to IP67.

Wednesday, October 22, 2014

Valve Actuation 101: Comparative Review of Pneumatic Actuators and Advantages of Rack and Pinion

Here's is a good presentation on the various types of industrial pneumatic valve actuators, such as scotch yoke, vane, diaphragm and rack and pinion, and their respective advantages and disadvantages.

Monday, August 4, 2014

More on the Scotch Yoke Hydraulic Manual Override for Quarter Turn Valves

Here is another quick video of a hydraulic manual override changing position of a large scotch yoke actuator (ROTEX DRS). The purpose of the manual override is to give operators the ability to override the spring position of the actuator by manually pumping air into the cylinder. An hydraulic pump is used to force air (up to 2000 PSI) in the spring-side of the actuator, thereby compressing it manually.

Directional hand valves are used to vent and divert the air to and from the actuator. The stainless steel hydraulic oil reservoir has twice the capacity required for safety, and all tubing between actuator and override is stainless steel as well.

Thursday, July 3, 2014

Watch a Pneumatic Scotch Yoke Actuator with Hydraulic Manual Override in Action

An interesting demonstration of a ROTEX DRS high performance scotch yoke pneumatic actuator mounted on a large ball valve. Video shows actuator opening valve, closing valve, the valve position indicator, the hydraulic manual override and manual hydraulic pump.  Good visual education for those who never saw a large valve and a large actuator.

Tuesday, May 6, 2014

Assembly Animation of ROTEX Rack & Pinion Actuators

Here is a good animation detailing the primary components and construction of the ROTEX ECV pneumatic valve actuator:

ROTEX ECV actuators distinguish themselves from other rack and pinion manufacturers by offering the following advanced features:
  • Self energizing V-Seal piston rings
  • Double rack & pinion
  • High corrosion resistance
  • Pinion supported on polyacetal bearings
  • Maximum working pressure 125 psig, optional 150 psig
  • No lubrication required
  • Temperature range -20 °F to +230 °F
  • Anodized body inside and out
  • Hard anodized pistons
  • ISO mounting for interchangeability
  • Anti-blowout pinion
  • Can be converted to spring return by just adding springs
  • Smooth burnished cylinder wall

Wednesday, April 23, 2014

Interesting Video of ROTEX Scotch Yoke Actuator and Manual Override

An actuation package supplied with ROTEX DRS actuator and manual override.

The DRS is a great choice for any large actuation drive because of the following features:

Friday, March 14, 2014

Advanced Design Considerations for Best-in-Class Scotch Yoke Actuators

Evaluating the design features of a Best-in-Class scotch-yoke pneumatic actuator, for example the Rotex Controls DRS.

Actuator Modularity

Actuator spring modules and pneumatic modules should be able to removed, swapped, rebuilt, or reinstalled on the frame module without disassembling the frame module. No need even to remove top cover of frame module, because all bolting for removal of the modules is external.

Monday, February 17, 2014

In-depth Video on How Scotch Yoke Actuators are Designed

For any new engineer involved in process control, beginner valve technician, sales or service professional or newbie to the valve industry, here is a helpful 7 minute video on how scotch yoke valve actuators are designed and constructed.

While this video outlines how ROTEX Controls builds their actuators, the video gives you a good general idea of the construction and major components.

ROTEX is a a recognized worldwide leader in manufacturer of valves actuators and valve accessories.

Wednesday, January 22, 2014

NEMA (National Electrical Manufacturers Association) Classifications for Limit Switches

limit switch enclosure
Choose the right Limit Switch enclosure
Limit switch enclosures carry classifications for tightness and protection from external environments. The National Electrical Manufacturers Association (NEMA) maintains these classifications.

Here is a listing of the most typical NEMA classifications for limit switches. The definition below are from the NEMA site and the entire document can be seen here.