Valve

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 […]

1. Background In many field applications, pneumatic valves are installed with an auxiliary air reservoir (air tank), commonly referred to as a “gas bag.” However, feedback shows that operators often connect it incorrectly or even leave it unused, which compromises its intended function. The air reservoir plays a crucial role: under normal conditions it remains

Introduction Pneumatic control valves play a crucial role in regulating process flow in industrial automation systems. However, due to complex operating environments and mechanical-electrical-pneumatic interactions, various faults may occur. This guide summarizes four common categories of failure, their causes, and practical troubleshooting methods. 1. Valve Fails to Actuate Typical Symptoms: Valve does not respond to

1. Introduction The performance, reliability, and service life of a control valve largely depend on the correct selection of trim materials and accessories. Inappropriate material or accessory choices can lead to corrosion, erosion, cavitation damage, and reduced control accuracy. This guideline provides practical selection criteria for various industrial process conditions. 2. Trim Material Selection Process

Check valves play a vital role in pump systems, ensuring water flows in the correct direction and preventing backflow that could damage equipment or disrupt operations. Correct installation is essential not only for system efficiency but also for the long-term protection of pumps and pipelines. In this article, we’ll explore two common installation positions for

In industrial automation systems, control valves often appear bulky and are perceived as relatively simple devices. However, they operate under complex process conditions on pipelines, and any malfunction can result in operational delays, system instability, and even environmental issues. Given their critical role in ensuring process control quality, proactive measures to extend their service life

Valves are critical components in industrial piping systems, and their performance depends significantly on their manufacturing process. Two primary types of valves based on manufacturing are cast valves and forged valves. Each has distinct characteristics, advantages, and suitable applications. This article explores their differences in terms of production, material properties, appearance, and use cases to

Emergency Shutoff Valves (ESV) are critical components in various industrial applications, such as the oil and gas, chemical, and petrochemical industries, designed to rapidly stop the flow of dangerous fluids or gases in the event of an emergency. These valves are crucial for preventing accidents, protecting human life, safeguarding equipment, and minimizing environmental damage. In

1. Overview of Common Stainless Steels: 201, 202, 301, 304, 316 Common considerations for stainless steel selection include rust resistance, hardness, and processability. The corrosion and heat resistance, toughness, and durability typically increase in the order: 201 < 202 < 301 < 304 < 316. Typical Parameters Comparison: Grade Density (g/cm^3) Thermal Conductivity (W/m.K @100°C)

1. Introduction to Common Stainless Steels (201, 202, 301, 304, 316) Stainless steels are widely used in industrial valve applications due to their corrosion resistance, strength, and thermal stability. Among them, grades 201, 202, 301, 304, and 316 represent the most commonly used options. The selection depends on environmental conditions, mechanical demands, and cost-performance tradeoffs.