01162018Tue
Last updateTue, 16 Jan 2018 4pm

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Technical

The Critical Stem Nut: Who is Responsible for Maintenance?

One of the most important components of an automated threaded stem valve is the ubiquitous stem nut, a relatively simple and unsophisticated mechanical device that converts the rotary motion of an actuator into the linear stem movement needed to open or close one of the many types of gate valves or sluice gates.


The Dos and Don’ts of Isolating Pressure Relief Valves

Typically, isolation valves are used to block off a pressure safety valve (PSV) from system pressure, so that maintenance on the valve or related equipment can be conducted without a shut down. While isolation valves are not used on every PRV installation, they are common and often found in critical service or for production areas that cannot tolerate a shutdown.

Problem-Driven Innovation

Developing Alternative Technology to Improve Product Performance

Industrial product engineering teaches us to understand the difference between problems and conditions. Control valve engineering in particular presents a variety of problems that interplay to reduce reliability.

Regardless of how the metering plug or the flow path is shaped, the fluid must make several turns to pass through a sliding stem, plug-in-seat globe control valve. Due to that design condition, damage from extended operation at high pressure drop is a problem. However, a solution to the problem is constrained by the condition, and the dominance of the condition stifles innovation in a mature product line.

Horizontal Knife Gate Valves: Challenges and Solutions

Knife gate valves are more commonly installed vertically, so why might a knife gate be positioned horizontally? Use of knife gate valves on the horizontal plane is more widespread than you might expect. For instance, horizontal installation would be beneficial when installing vertical pipes and encountering spacing issues, and when using various types of media. Knife gates were originally designed to be situated vertically, so there are certain considerations to be made and challenges to face when installing valves horizontally, especially valves 18 inches and larger.

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