Valve

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

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