12132017Wed
Last updateTue, 12 Dec 2017 7pm

i

Process Instrumentation in Oil and Gas

Process Instrumentation in Oil and Gas

Process instrumentation is an integral p...

Check Valves in LNG Cryogenic Service

Check Valves in LNG Cryogenic Service

Because natural gas is currently conside...

Will Smart Machines Obsolete Human Resources?

Will Smart Machines Obsolete Human Resources?

Is artificial intelligence (AI) going to...

Is Valve Live Loading an Option?

Is Valve Live Loading an Option?

Valves leak. There’s no getting ar...

Subscribe SUM17

FREE SUBSCRIPTION*

• Print magazine
Digital magazine
• VALVE eNews
Read the latest issue

*to qualified valve professionals in the U.S./Canada

The Weekly Report

New Products

  • ja-news-2
  • ja-news-3

Industry Headlines

U.S. LNG Exports Increased as New Facilities Come Online

Tuesday, 12 December 2017  |  Chris Guy

In August 2017, total U.S. natural gas liquefaction capacity in the lower 48 states increased to 2.8 billion cubic feet per day (Bcf/d) following the ...

Readmore

Loading...
Advertisement
i

Web Only

Construction and Mining: Is 2018 The Year for Growth?

Construction and Mining: Is 2018 The Year for Growth?

Tuesday, 12 December 2017  |  Kate Kunkel

While there is a degree of optimism in the mining industry that hasn’t been seen for some years, much uncertainty still exists in this sector. A...

Readmore

Loading...

Industry Headlines

CIRCOR Completes Acquisition of Colfax Fluid Handling

12 HOURS AGO

CIRCOR International has completed the previously announced acquisition of Fluid Handling (FH) from Colfax Corporation for approximately $693 million of cash and newly issued CIRCOR shares, and $150 million related to the assumption of pension plan liabilities linked to the FH business. FH will become...

Readmore

Classic Controls Certified by ITT Engineered Valves, REXA

5 DAYS AGO

Classic Controls is now certified by ITT Engineered Valves to repair Skotch brand FM approved and general purpose burner shut-off valves for oil and gas fired systems.

REXA, Inc. has also appointed Classic Controls as its exclusive authorized sales representative in the state of Florida. Classic Contr...

Readmore

U.S. LNG Exports Increased as New Facilities Come Online

11 HOURS AGO

In August 2017, total U.S. natural gas liquefaction capacity in the lower 48 states increased to 2.8 billion cubic feet per day (Bcf/d) following the completion of the fourth liquefaction unit at the Sabine Pass liquefied natural gas (LNG) terminal in Louisiana. With increasing liquefaction capacity...

Readmore

China to Become Second-Largest LNG Importer

5 DAYS AGO

The world’s no. 1 energy user, China, “is on the verge of passing South Korea to become the No. 2 buyer of LNG behind Japan, as environmental measures and winter heating needs boost demand,” Bloomberg reports .

“Tankers with total capacity of 33.6 million metric tons have visited...

Readmore

NAM Survey: Manufacturers’ Optimism Reaches Record High

14 HOURS AGO

The National Association of Manufacturers (NAM) released the results of the Manufacturers’ Outlook Survey for the fourth quarter of 2017, showing manufacturers’ optimism has risen to unprecedented heights amid the legislative progress made on tax reform. With 94.6% of respondents saying ...

Readmore

Construction Index Remains Strong in November

1 DAY AGO

The Dodge Momentum Index surged again in November, climbing 13.9% to 149.5 from the revised October reading of 131.3. The Momentum Index is a monthly measure of the first (or initial) report for nonresidential building projects in planning, which have been shown to lead construction spending for non...

Readmore

Solenoid Valves

sum11_b2b_solenoid_introSolenoid valves are usually considered an accessory in the process valve industry; however, while there is some truth to this, these accessories are crucial to the proper operation of any system that uses them.

The solenoid valve has many features that need to be considered when creating a specification. Eight specification points should be addressed to correctly choose the right solenoid valve for an application. These specification points are:

  • Type
  • Operation
  • Media
  • Size
  • Pressure
  • Atmosphere
  • Voltage
  • Extras

More information on these eight points is included in this article.


TYPE

sum11_b2b_fig1Figure 1. 2-way solenoid valves used to start and stop the flow of media in a pipe trainThe type of solenoid valve refers to whether that valve is a 2-way, 3-way or 4-way. A 2-way valve (Figure 1) has two port connections-a pressure or input port (port 1) and an outlet port (port 2). These valves are used to stop the flow of a fluid or start the flow of a fluid in a piping configuration. Usually, a 2-way valve is referred to as a 2/2 valve, which means the valve has two ports and two positions. The positions are: 1) on or energized and 2) off or de-energized.

Three-way valves (Figure 2) are those that have three ports-a pressure or inlet port (port 1), a cylinder port (port 2) and an exhaust port (port 3). A 3-way valve’s most common application is for process valve automation. The solenoid valve sends air to a spring return actuator or cylinder, which creates rotational or linear movement to open or close a process valve. In this case, the media is usually compressed air or gas that is creating work, which is where the term “fluid power” is derived. The power of a compressed gas or pressurized liquid is controlled to create mechanical work. Three-way valves are usually referred to as 3/2 valves-they have three ports and two positions.

sum11_b2b_fig2Figure 2. Basic 3- and 4-way valves typically used for process valve automationFour-way valves (Figure 2) can have four or five ports-a pressure or inlet port (port 1), two cylinder ports (ports 2 and 4), and one or two exhaust ports (port 3 and possibly a port 5). The exhaust ports can either have both cylinder ports sharing a common exhaust port or have each cylinder port with its own exhaust port. This valve’s primary use is also for process valve automation. For double-acting or non-spring return actuators and cylinders, a 4-way valve must be used. Air flow in a 4-way valve is more complicated than air flow in some other types. For example:

  • In cases where the valve is de-energized or off: The pressure port to cylinder port 2 is open while cylinder port 4 to exhaust is open.
  • In cases where the valve is energized or on: The pressure port to cylinder port 4 is open while cylinder port 2 to the exhaust is open.

Since the actuator or cylinder does not have a spring on one side, it must rely on fluid power from a 4-way valve to open and close. Four-way valves can be referred to as 4/2 or 5/2 valves, and they can have four or five ports and two positions.

There are other configurations such as the dual solenoid, fail-in-last-position, 3/3, and 5/3 solenoid valves, but explanations are best left for another article.

  • Latest Post

  • Popular

  • Links

  • Events

Advertisement

Looking for a career in the Valve Industry?

ValveCareers Horiz

To learn more, watch the videos below or visit ValveCareers.com a special initiative of the Valve Manufacturers Association