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Young Valve Professionals: Logan Moore

Young Valve Professionals: Logan Moore

In 2014, VMA's leadership created the Va...

VALVE Magazine: Readers' Choice 2017

VALVE Magazine: Readers' Choice 2017

Happy New Year to our VALVE Magazine rea...

Educational Opportunities Abound at New VMA Knowledge Forum

Educational Opportunities Abound at New VMA Knowledge Forum

From technical to manufacturing to human...

Offshore Production in a Low Oil-Price Environment

Offshore Production in a Low Oil-Price Environment

Three years ago, The Washington Post publi...

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Interior Coatings for Waterworks Valves

Interior Coatings for Waterworks Valves

Monday, 15 January 2018  |  John V. Ballun, P. E.

Since the 1990s, two types of epoxy coatings have been commonly specified and used for iron valves in the waterworks industry: fusion-bonded epoxy and...

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Industry Headlines

ASCO Valve and Numatics Now Doing Business as ASCO, L.P.

6 HOURS AGO

Effective January 1, 2018, ASCO Valve, Inc. and Numatics, Inc. began doing business as ASCO, L.P. This change in legal entities affects neither current channel alignment nor purchasing processes—everything will remain the same, including product authorizations. Within ASCO, a business unit of Em...

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Union Tech Names Chris Mayo Director for Global Power

8 HOURS AGO

Union Tech recently announced that Chris Mayo has joined the valve sales team as director for global power. He will be primarily responsible for power markets, which include Union Tech’s Z1 Unibody Power Valve amongst other valve products in the Z-Series line.

Mayo is an industry veteran who bri...

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Pipeline Capacity Expansions Accelerating in U.S. Northeast

1 DAY AGO

With projects such as Columbia Gas Transmission’s Leach Xpress and Energy Transfer Partners’ Rover pipeline, “[t]he U.S. northeast should realize an increase of more than 3 Bcf/d of natural gas pipeline capacity by the end of this quarter, compared with an increase of 2.3 Bcf/d in ...

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EIA Forecasts Increasing Global Crude Production Through 2019

5 DAYS AGO

The U.S. Energy Information Administration’s (EIA) new Short-Term Energy Outlook forecasts Brent crude oil to average $60 per barrel (b) in 2018 and $61/b in 2019, slightly higher than the $54/b average in 2017. In both 2018 and 2019, EIA expects total global crude oil production to be slightly ...

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Manufacturing Technology Orders Increased in November

8 HOURS AGO

Orders for manufacturing technology climbed year over year and year to date in November 2017 according to the Association for Manufacturing Technology (AMT). Orders totaled $425.97 million for the month, up 19.0% compared to November 2016. At a cumulative total of $4.06 billion for the year, orders we...

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Texas Employment Forecast Calls for 3% Growth

6 DAYS AGO

Texas job growth is forecast to strengthen to 3% in 2018 from an estimated 2.5% in 2017, according to the Federal Reserve Bank of Dallas . The forecast means Texas should add about 366,000 new jobs in 2018. Texas added 305,900 jobs in 2017, ranking No. 3 in the nation for job growth after falling belo...

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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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