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Valve Basics Training Helps Fill Industry Skills Gap

Valve Basics Training Helps Fill Industry Skills Gap

One of the most keenly felt needs in tod...

An End-User’s Perspective on Valve Selection and Risk

An End-User’s Perspective on Valve Selection and Risk

I am not a valve expert, although I ofte...

New Test Stamp and More Updates on Pressure Vessel Codes

New Test Stamp and More Updates on Pressure Vessel Codes

A new test organization program and stam...

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Industry Headlines

Why Gas Won’t Be Traded Like Oil in the Future

Wednesday, 31 August 2016  |  Chris Guy

Natural gas can be transported anywhere on LNG carriers, but will “probably remain regionally priced for the time being, with some contracts con...

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Industry Headlines

Chemours Selects Wilmington, DE for its Global Headquarters

1 DAY AGO

The Chemours Company will locate its global headquarters in Wilmington, DE. Chemours began evaluating headquarters location options more than 6 months ago with Delaware, New Jersey and Pennsylvania all under active consideration. Recent changes to Delaware’s corporate tax structure were key comp...

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ValvTechnologies Successfully Completes NUPIC Audit

6 DAYS AGO

ValvTechnologies, Inc. recently achieved NUPIC-approved suppliers list status, upon successful completion of the Nuclear Procurement Issues Committee (NUPIC) audit conducted at the Houston facility. NUPIC members include all domestic U.S. nuclear utilities as well as several international members.

Form...

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Why Gas Won’t Be Traded Like Oil in the Future

1 HOUR AGO

Natural gas can be transported anywhere on LNG carriers, but will “probably remain regionally priced for the time being, with some contracts continuing to track oil, said Roger Bounds, senior V.P. for global gas at Shell. Prices will depend on location, regulation and infrastructure, as some c...

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Feds Warn of Bolt Failures in Offshore Drilling

20 HOURS AGO

On Monday, Bureau of Safety and Environmental Enforcement (BSEE) director Brian Salerno held a press conference aimed at oil & gas regulators. The issue he wanted to draw attention to is the failure of bolts in offshore drilling equipment such as blowout preventers. This problem, Salerno says, has...

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U.S. Consumer Confidence at 11-Month High

3 HOURS AGO

The Conference Board Consumer Confidence Index, which had decreased slightly in July, increased in August. The Index now stands at 101.1 , compared to 96.7 in July. Consumers’ appraisal of current conditions improved in August. Those stating business conditions are “good” increased f...

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Advanced Manufacturing Outpaces Rest of Production Sector

1 DAY AGO

A new report from the Brookings Institution finds that high-tech advanced manufacturing bucked both global economic challenges and the longstanding shrinking of the traditional manufacturing sector over the last two years. While job losses were felt in other pockets of the production sector, advance...

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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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