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Last updateTue, 28 Mar 2017 8pm

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Valves Help Enable Net-Zero Water Use

Valves Help Enable Net-Zero Water Use

With drought and climate change affecting ...

Valve Selection in Pulp and Paper Operations

Valve Selection in Pulp and Paper Operations

Over the centuries, the pulp and paper i...

How to Improve Control Valve Performance with Positioners

How to Improve Control Valve Performance with Positioners

As the final control element in most pro...

VMA Technical Event: Engineering Valves in the Extreme

VMA Technical Event: Engineering Valves in the Extreme

While much the 2017 VMA Technical Semina...

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Industry Headlines

Colorado Seeing Surge in Oil & Gas Investments

Tuesday, 28 March 2017  |  Chris Guy

“Drilling applications and investments by oil and gas companies are surging in Colorado after crude prices partially rebounded from their collap...

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Industry Headlines

Emerson Opens Second Additive Manufacturing Center

1 DAY AGO

With the goal of spurring innovation to address customers’ engineering design challenges and accelerating speed to market for new, rigorously-tested products, Emerson opened an advanced additive manufacturing center at its Singapore campus. This is Emerson’s second location to have additiv...

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GE Oil & Gas Expands with New Sub Saharan Africa Facility

5 DAYS AGO

GE Oil & Gas opened a new facility in Takoradi Port, Ghana, expanding its global footprint and supporting local investment. The facility, which will be the primary service center for deep-water offshore projects in Ghana, has a 1,600 square meter indoor test area with capability for testing thre...

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Colorado Seeing Surge in Oil & Gas Investments

10 HOURS AGO

“Drilling applications and investments by oil and gas companies are surging in Colorado after crude prices partially rebounded from their collapse in recent years, pushing the industry deeper into residential communities largely unaccustomed to drilling,” the Associated Press is reporting .

&...

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U.S. Specialty Chemicals Markets Accelerated in February

1 DAY AGO

The American Chemistry Council (ACC) reported that U.S. specialty chemicals market volumes rose a strong 0.6% in February. This follows an upwardly revised 0.4% gain in January. Volumes have generally been moving up since May. All changes in the data are reported on a three-month moving average (3MMA)...

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Four Out of Ten Jobs Could be Lost to Automation by 2021

11 HOURS AGO

Automation is the new norm across sectors and will affect the bottom of pyramid so much so that four out of every 10 jobs globally would be lost due to this by 2021, experts say. As automation adoption increases, all high transaction and labor intensive jobs will take a hit. According to PeopleStrong...

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U.S. Durable Goods Orders Rose 1.7% in February

1 DAY AGO

New orders for manufactured durable goods in February increased $3.9 billion or 1.7% to $235.4 billion, the U.S. Department of Commerce announced . This increase, up two consecutive months, followed a 2.3% January increase. Excluding transportation, new orders increased 0.4%. Excluding defense, new or...

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When Accessories Become Necessities

vmspr10 beyond valves 1This automated valve assembly is made up of a process ball valve, pneumatically operated actuator, solenoid valve and inductive non-contact valve position sensor and target.Specification sheets for selecting automated valves list requirements for the valve and actuator but often lump all other devices together as related instrumentation or accessories.

Since the definition of an automated valve is a flow control device that can be remotely operated, a typical selection hierarchy is:

  1. Select the best valve for the service conditions
  2. Select a suitable actuator to operate that valve
  3. Provide enough information on accessories so the valve supplier or end user can just add them as needed.

A comprehensive valve data sheet may enumerate 40 to 50 line items of information that define the scope of the valve assembly. Since performance and safety of that assembly are greatly impacted if any component in the assembly fails, the more forethought put into the specification, the more likely the final assembly will perform as intended. The purpose of a specification is not to exclude any manufacturer but rather to include only those products the specifier perceives as most closely meeting the equipment application requirements.

THE SPEC SHEET

If we look at all system devices as necessities instead of accessories, we can divide the specification sheet into three sections.

  1. Under Process Components all devices that are in contact with the media would be listed. That would include the valve and instrumentation such as flow meters and other process variable transmitters.
  2. Under Force all devices that supply the motive power to operate the valve would be listed. This would include the actuator—pneumatic, electric or hydraulic; hand-wheel overrides; linkage kits/mounting brackets; solenoid valves; filter regulators; pressure gauges, etc.
  3. The third column would be headed Intelligence. This category would include valve position sensors. Intelligent devices interface the operator’s commands and the valve’s response. Without supervision/control, the automated valve will not function; therefore, the process will not function.

vmspr10 beyond valves 2The automated valve assembly shown here is for use in a hazardous location. It consists of a process ball valve with pneumatically operated actuator, solenoid valve and inductive NAMUR non-incendive valve position sensor and target. Note that the solenoid valve is driven from the valve position sensor, which simplifies wiring.Valve position sensors indicate to the plant operator that an automated or control valve is open, closed, or between open and closed. A valve position sensor or switch can take numerous forms: inductive proximity sensor, reed switch or mechanical switch. Sensors can be directly mounted to a rotary pneumatic actuator, bracket-mounted to a linear valve, enclosed inside a switch box or an electrically operated actuator, or inside a valve positioner.

An inductive proximity sensor is a non-contact device, which means the sensor is free from wear. A common metal target is mechanically attached to the actuator stem of a linear or rotary travel valve. When the target comes into range of detecting the sensor, an electronic switch changes state, which confirms the position of the valve. Actuation speed or frequency has no effect on inductive proximity sensors. They are typically used in pairs, one for the valve’s open position and another for the closed position, although sensing other positions can be easily accomplished. Dual sensors directly mounted onto a pneumatic actuator provide valve open and valve closed switching in one compact package. Proximity sensors are available in a variety of configurations and voltages and can be an integral part of a valve assembly, especially when the sensor’s full capabilities are utilized.

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