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Should a Cut-off Valve Be Installed in the Inlet and Outlet Pipelines of a Safety Valve?

This seemingly simple question has caused confusion for many companies and designers. Some choose to install cut-off valves, while others don’t, with practices varying widely. But what do the standards say? Are there clear requirements in the regulations? In this article, we will clarify the principles for the installation of cut-off valves in safety valve […]

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Components of Process Control Instruments

Components of Process Control Instruments Transmitter UnitThe transmitter unit converts measured parameters (such as set parameters in an automatic control system) into standardized signals for indication, recording, or control. Common types of transmitters include pressure transmitters, differential pressure transmitters, flow transmitters, temperature transmitters, differential temperature transmitters, and level transmitters.Transmitters can be categorized into two types

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RF Capacitance / RF Admittance Level Switch: The Impact of Probe Diameter on Capacitance Changes

RF Capacitance (or RF Admittance) Level Switches are vital instruments for industrial liquid level measurement. The core principle behind their operation is based on changes in capacitance. A rod-type RF capacitance probe measures the change in capacitance between the probe and the container wall to determine the level, ensuring reliable liquid level monitoring. Although this

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Inaccurate Display and Fluctuating Output Values of Mass Flow Meters: Troubleshooting and Solutions

1. Abnormal Cumulative Flow in Mass Flow Meter Troubleshooting: A mass flow meter at a plant showed cumulative flow even when there was no process flow. Upon inspection, it was found that the supports at both ends of the sensor did not meet installation requirements. Specifically, the support distances were uneven, and the bottom of

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Common Challenges Faced by Engineers: Should Equipment Continue Running or Be Shut Down?

In industrial settings, it’s common to hear statements like: “The equipment is still running, why shut it down?” “If we shut it down now, who will bear the loss?” “It was just repaired last year, why is it failing again?” These questions are heard every day. But what’s more difficult is the aftermath of an

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Is Your Pressure Transmitter Really Faulty? In Most Cases, It’s Innocent

In industrial settings, there’s a dangerous “knee-jerk” reaction that can be costly: Whenever the pressure transmitter readings fluctuate, technicians often suspect the device is faulty and immediately request a replacement. What happens next? A new transmitter is installed, but within a few days, the same “drift” occurs again. Engineer Li, with years of experience in

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Reasons and Solutions for Large Fluctuations in Thermal Mass Flow Meters

Thermal mass flow meters, commonly used for measuring the mass flow rate of gases or small amounts of liquids, may experience significant fluctuations, leading to unstable readings that can impact process control. The causes of such fluctuations should be investigated from multiple aspects, including the properties of the medium, instrument installation, equipment parameters, and external

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Understanding Valve and Piping Codes in Engineering Drawings

When engineers first look at a piping or P&ID drawing, one thing becomes immediately noticeable:there are not many words, but there are many letter combinations. These letters are what we commonly call valve and piping codes.At first glance, they may look complicated, but in reality, they are simply a compact way of expressing technical information.

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Laminar Flow, Turbulent Flow and Reynolds Number

A Practical Guide to Flow Measurement and Flowmeter Selection Introduction Why does an electromagnetic flowmeter become less accurate when measuring sludge-containing wastewater?Why does a steam flow measurement still fluctuate badly even when an imported differential pressure transmitter is installed?Why does an oval gear flowmeter measuring lubricating oil seize after only a few months of operation?

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