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Purpose of the Three-Valve Manifold Operation Sequence

When operating a three-valve manifold for differential pressure instruments, two principles must always be observed: Never allow the condensate or sealing liquid in the impulse lines to drain. Never expose the measuring element (diaphragm or bellows) to sudden pressure or temperature stress. To achieve this, the three-valve manifold must be operated in the correct sequence […]

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Understanding GO/NO-GO Gauges: Why “Dimensionally Qualified” Parts Still Fail During Assembly

In machining and manufacturing workshops, many engineers have encountered the following paradox: The inspection team insists: “All dimensions are within tolerance.” But at the assembly station, the shaft simply cannot enter the hole—no matter how much force the technician applies. Drawings are correct, machining offsets are correct, and measuring tools appear normal. Yet assembly still

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Pulse Signal Selection and Timing in DCS Control Logic

Pulse signals are widely used in Distributed Control Systems (DCS) to trigger one-time actions such as valve actuation, counter increments, reset commands, and interlock releases. Selecting the proper pulse type—short or long—and determining appropriate pulse duration are essential to ensure reliable operation, prevent false triggering, and avoid missed actions. This article explains the engineering rules,

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Should Metal Hoses Be Installed Before or After the Emergency Shut-Off Valve?

In tank farm piping design, both metal flexible hoses and emergency shut-off valves (ESVs) are critical safety components. However, when they appear on the same pipeline, engineers often ask: “Should the metal hose be installed upstream or downstream of the emergency shut-off valve?” This article explains the correct arrangement from the perspectives of functional requirements,

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The Principle and Application of Thermal Relays

Thermal relays are essential components in electrical systems, widely used for overload protection of motors and other electrical equipment. Their operation is based on the principle of thermal effects caused by electric current. This article delves into their working principle, structure, and practical applications, offering a comprehensive understanding of this indispensable device. Working Principle of

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Why Winter Insulation is Critical for Instrumentation and Pipelines in Factories

In the winter months, many factories, especially in northern regions, are most concerned not with large equipment, but with the intricate network of pipelines and instrumentation spread throughout the facility. Gas supply pipes may freeze, differential pressure cells may become inaccurate due to ice accumulation, and level measurement lines may become blocked with ice. Even

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The Working Principle of Vortex Flowmeters and the Need for Temperature and Pressure Compensation when Measuring Steam

1. Working Principle of Vortex Flowmeters Vortex flowmeters operate based on the Kármán vortex street principle. The core mechanism involves detecting the frequency of vortices generated in the fluid to calculate the flow rate. Vortex Formation: In a pipeline, a non-streamlined body (such as a cylindrical or triangular pillar) is placed. As the fluid flows

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Differential Pressure Transmitter: Dry and Wet Capillary Connections

A differential pressure transmitter is a widely used instrument in industrial processes. As part of the process control system, it converts the differential pressure (pressure), flow, level, and other process parameters of liquids, gases, or steam into standardized output signals (such as 4-20mA current). These signals are used as input for display instruments, controllers, and

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Understanding Positive Displacement Flowmeters: From Structure to Installation

Key Components of a Positive Displacement Flowmeter A positive displacement (PD) flowmeter is composed of several essential parts, each serving a distinct function: Measuring Section: This is the core of the flowmeter, consisting of a rotor, housing, and cover plate that form the measurement chamber. When fluid passes through, the rotor spins continuously, with the

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MES System and Its Functional Modules: How MES Connects with Field Instruments

Manufacturing Execution Systems (MES) play a crucial role in bridging the gap between enterprise-level planning (ERP) and real-time shop-floor operations. By integrating with field instruments, PLCs, and automation devices, MES provides full visibility, traceability, and control across the entire production cycle. This article outlines the key functional modules of an MES system and explains how

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