Valve

In process automation, the terms control valve, regulating valve, and instrument manifold (instrument valves) are mentioned daily.Although all of them are “valves,” they perform entirely different roles in a process control loop. This article provides a clear engineering-level comparison across system architecture, industry applications, sizing considerations, reliability, and safety. 1. A Simple Control Loop Perspective […]

In industrial fluid control systems, the velocity of the medium downstream of a control valve is a key factor affecting system stability, equipment service life, noise generation, and overall operating efficiency. Selecting an appropriate velocity range requires considering the fluid type, thermodynamic conditions, pipeline configuration, and valve design. There is no single universal value, but

The question of whether safety valves can forgo annual calibration depends on several factors, including regulatory requirements, equipment usage conditions, and risk management practices. Safety valves are critical components in ensuring the safe operation of pressure-containing equipment, and their reliability is paramount. Below is a detailed exploration of this issue. 1. Regulatory and Standards Compliance

Cryogenic valves are widely used in industries dealing with extremely low-temperature media such as liquid oxygen, liquefied natural gas (LNG), and others. These media are not only highly flammable and explosive, but they also vaporize rapidly upon warming, causing a volume expansion of several hundred times, which creates significant safety risks. So, why are high

In industrial automation, the coordination between the valve stroke and positioner is critical for accurate control. Although butterfly valves inherently have a 90° rotational stroke, setting this value to 90° in some positioners can lead to mismatches and errors. This article explores why this happens and how to address the issue. Understanding the Feedback Mechanism

Pneumatic control valves are essential components in industrial automation systems. They regulate process parameters like flow rate, pressure, and temperature by receiving pressure signals (usually 0.02-0.1 MPa or 3-15 psi) from controllers (such as DCS or PLC). The selection of the right pneumatic control valve is crucial for system efficiency and performance. Below, we categorize

In modern industrial pipeline systems, valves play a crucial role in controlling the flow, pressure, and direction of fluids. They are widely used in industries such as petrochemicals, power generation, metallurgy, water treatment, pharmaceuticals, and energy. Different types of valves offer unique advantages in terms of structural design, sealing performance, and operational characteristics. Understanding the

1. Causes of Valve Internal Leakage: Corrosion and Wear of Valve Core or Valve Seat: Over time, wear and corrosion can compromise the sealing performance of the valve, leading to internal leakage. Corrosion of the External Thread of the Valve Seat: Corrosion can damage the valve seat’s external threads, affecting its sealing capability. Large Pressure

Introduction A globe valve is a widely used fluid control valve designed to start, stop, and regulate fluid flow. This article provides a detailed overview of the globe valve, its working principles, structural features, sealing performance, fluid control characteristics, operation, maintenance, and applications in various industries. I. Working Principle of Globe Valves Definition: A globe

1. Introduction Differential pressure gauges (often used with differential pressure transmitters) are designed to measure the pressure difference between two process points.To ensure safe operation and measurement accuracy, strict operating rules must be followed when using the three-valve manifold.The primary objective is to protect the differential element (e.g., diaphragm capsule) from overpressure, pressure shock, or