Actuators & Controls
- Published on Tuesday, 16 September 2014 11:48
- Written by Ed Holtgraver
We’ve all seen this situation: A quarter-turn valve is in the closed position. A pneumatic actuator applies an opening torque that exceeds what’s required to begin to open the valve. Suddenly, the valve “jumps” or “pops” open to as much as 45 degrees or more, resulting in a sudden surge of potentially disruptive flow. Why did this occur and how can we avoid this phenomenon?
- Published on Tuesday, 08 July 2014 07:48
- Written by Chris Warnett
The conventional perception of a motorized valve is one of a large isolating valve with a heavy-duty valve actuator, usually powered by a three-phase electrical supply. However, many processes require smaller valves, and those valves often call for small electric actuators for isolating and modulating applications. As a result, the number of these smaller actuators is steadily growing.
- Published on Friday, 28 March 2014 09:39
- Written by Mike Heuseveldt
Because of the potential harm and damage to people and property, fires and explosions are a major concern in refinery, gas processing, petrochemical and offshore, and many other types of facilities. Minimizing the danger requires efficiently protecting the systems that control the potentially hazardous areas of those facilities. In many of them, valve operators, gear boxes and associated components are a top priority for safeguarding. This is because proper fireproofing of these components can mean this critical equipment can be controlled during an emergency, thereby preventing catastrophe.
- Published on Tuesday, 10 December 2013 09:02
- Written by by Ross Wolkart and Daniel Myers
More than 200 pipeline systems in the United States alone transmit natural gas through more than 300,000 miles of intrastate and interstate pipelines. What’s more, 1,400 compressor stations operate in the U.S. to transfer the gas through the transmission pipelines to ultimate distribution points1. As the industry continues to grow, pipeline operators seek alternatives to traditional equipment to ensure pipeline safety and reliability. That includes new types of actuators.
- Published on Friday, 14 December 2012 12:01
- Written by Rich Oaks
The key to successful sizing or selection of the right valve actuator for a job is communication. That communication occurs between the specifier of the automated valve, the valve supplier and the actuator supplier. The selection process itself is straightforward—actuator manufacturers publish selection or technical data charts. The task of the person who is sizing or selecting consists of comparing the project’s valve actuation requirements against the actuator manufacturer’s published data.