Valve

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

1. Introduction Pneumatic control valves rely on compressed air as the driving source. In case of air supply failure, the valve must move to a predefined safe position to prevent process upsets, equipment damage, or safety incidents. This pre-defined action is referred to as Fail Action, and typically includes three categories: FC (Fail Close): Valve

1. Introduction Control valves are the final control elements in process automation, typically consisting of an actuator, valve body, internal trim, and accessories.Accessories such as positioners, solenoid valves, quick exhaust valves, and air reservoirs are critical in ensuring reliability, safety, and fast response. This document summarizes the key accessories and demonstrates typical pneumatic circuit configurations

1. Introduction Solenoid valves are widely used actuators in industrial process control. Their performance and safety characteristics are closely related to the type of power supply. The two most common options are 24V DC (direct current) and 220V AC (alternating current) solenoid valves. This article provides a systematic comparison between the two, covering power supply,

1. Introduction Wear-resistant ball valves serve as critical control points in industrial fluid transportation systems. Once failure occurs, even minor issues may cause media leakage, while severe cases can lead to equipment seizure, production downtime, and costly repairs. This document analyzes common failure modes of wear-resistant ball valves, identifies underlying causes, and proposes preventive measures.

1. Background and Standard Requirement In the petrochemical industry, design standards directly affect operational safety and reliability.According to SH/T 3005-2016 “Specification for Selection and Design of Petrochemical Automation Instruments”, clause 10.3.6.8 states: “A manual valve shall be installed in the air line of a pneumatic actuator. By operating this manual valve on site, the actuator