Metso Neles Flow Control Solutions: Valves, Actuation, and Automation

Neles Controls, a unit of Metso Automation, is a manufacturer of high quality rotary control valves,
on/off valves, actuators, positioners, emergency shutdown valves (ESD), digital valve position
control products and severe service specialty valve products.

Their product mix includes:

• Control Valves
• Globe Control Valves
• On-Off Valves
• ESD Valves, Engineered Valves
• Smart Positioners 
• Analog Positioners
• Pneumatic Actuators
• Electric Actuators
• Limit Switches

Below is their comprehensive Flow Control Solutions catalog. You may review the embedded document, or download a PDF version of the Neles Flow Control Solutions here.

Metso Neles Flow Control Solutions: Valves, Actuation, and Automation from Mead O'Brien, Inc.

Mead O'Brien: Total Process Control Solutions Provider

As experts in valve automation, process instrumentation, steam systems and hot water systems, Mead O'Brien provides solutions to industrial companies in Missouri, Kansas, Nebraska, Iowa, Oklahoma, Arkansas, Texas Panhandle, Southern Illinois, Western Kentucky, and Southwest Indiana.

Specializing in Power, Refining, Chemical, Food & Beverage, Oil & Gas, Heavy Industrial, Water & Wastewater, and HVAC,  Mead O’Brien provides it's customers outstanding products, superior customer service, a team of highly skilled technicians, and decades of application experience.

These assets, in combination with their track record of successful outcomes and loyal customer base, positions Mead O'Brien as the perfect partner for all your process control equipment needs.

Give Mead O'Brien a call today.

https://meadobrien.com
(800) 892-2769

Electric Valve Actuation

Limitorque Electric Valve Actuator

Electric actuators use electrical power to actuate a valve. While most of the basic technology used in electric actuators has been around since the 1930s, decades of incremental improvement have significantly increased their functionality while dramatically reducing their cost. In recent years, these advances have reached a tipping point that makes electric actuators the first choice for a wide variety of applications.

Pros

• Electric power is relatively inexpensive, easy to manage, and normally available to most industrial sites. The capital cost of electric actuators is typically cheaper per equivalent unit of torque/thrust output. They’re also cleaner and safer to operate. 
• Electric actuators can provide superior positioning accuracy for control or modulating valve functions, which can include provisions for a high degree of process monitoring, data logging and information feedback. 
• All necessary control functions are integral to electric actuators, reducing capital costs. 
• Electric actuators significantly reduce control wiring costs by enabling distributed control. They simplify control logic by integrating control commands and feedback into customer SCADA or DCS systems. (Traditional electromechanical control systems require a dedicated wire for each command and feedback signal, leading to cable bundles with seven or more cores as minimum for each actuator. By contrast, a typical bus system can use one twisted pair wire in a daisy chain configuration to carry all required input and output signals.) 
• As torque and thrust requirements increase, electric actuators weigh less and have smaller footprints compared to pneumatic actuators. 
• Electric actuators may be combined with external gearboxes to produce extremely high output thrust and torque values.

Cons

• With the exception of a few specific configurations, electric actuators can’t guarantee a fail-safe stroke but will “fail in the last position.” (Fail-safe stroke refers to an actuator’s ability to move a valve to a predefined safe position when power fails).
• Electric actuators have more complex and sensitive components than the mechanical parts used in other types of actuators. Electronic technology also requires periodic refreshing to keep pace with component changes and improvements.
• Beyond a certain size/torque range, electric actuators are less cost-effective and generally have limitations in operating speed when compared to pneumatic and hydraulic actuators.
• In hazardous areas with potential exposure to explosive process media, electric actuators require more specific certifications and construction features to be considered safe for use.

Recommended applications

Electric actuation is the first choice for most oil and gas applications. They’re ideal for general process valve automation, non-critical applications, and light-duty modulating applications (generally up to 1200 starts per hour), although some can modulate continuously up to 3600 starts per hour.

Reprinted with permission from the Flowserve Limitorque white paper titled "Valve Actuation: The When, How and Why of Actuator Selection" which can be downloaded here.