Valve

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.

1. Introduction Valve selection is a critical aspect of piping system design in chemical processes. The right valve type ensures process efficiency, safety, and longevity of the equipment. This guide outlines the general principles of valve selection and provides practical recommendations for commonly used valve types. 2. General Selection Principles 2.1 Define the Valve Function

Valves are essential components in pipeline systems across many process industries. Among the most critical aspects of valve performance is the sealing mechanism, as poor sealing can lead to serious safety hazards. Incidents caused by valve leakage, particularly in confined spaces, have led to suffocation, poisoning, fires, and explosions. Note: No matter how reliable a

1. Overview of Gate Valve Structure Gate valves are widely used in industrial sectors such as petrochemicals, power stations, long-distance pipelines, and marine applications. They control the flow of media by moving a gate (wedge or parallel plate) between the valve seats to open or close the passage. A typical gate valve is composed of

1. Function of Fusible PlugsFusible plugs are temperature-sensitive safety components made from low-melting-point alloys. When ambient temperature exceeds a predefined threshold (typically 70–200°C), the plug melts and triggers the emergency shut-off valve (ESV) to close automatically. This serves to: Prevent hazardous media leaks during fire or extreme heat; Protect equipment from thermal damage or explosion;

1. Why Are Large Globe Valves Difficult to Operate? For globe valves with diameters of DN200 and above, manual operation becomes significantly more difficult due to increased resistance. The average horizontal torque an adult can apply is approximately 60–90 kg, depending on physical strength. Standard globe valves are designed for flow direction from low to

In industrial process automation, control valves are among the most important final control elements. Valve positioners—especially smart electro-pneumatic types—play a vital role in improving control accuracy, response speed, and system efficiency. Smart valve positioners can be classified by their I/P converter mechanisms into two main types: nozzle-flapper and piezoelectric valve. Leading global manufacturers use different

Ball valves are widely used in industrial pipelines for fluid control. Among them, C-type, O-type, and V-type ball valves are three common types, each with distinct structural designs, sealing mechanisms, and application suitability. This article outlines their key differences to assist in proper selection and usage. I. Structural Design and Working Principle 🔹 1. C-Type

Globe valves are commonly used in industrial pipelines for fluid control, especially where precise throttling or frequent operation is needed. One frequently asked question is whether the flow direction of a globe valve must always follow the “low in, high out” principle. While “low in, high out” is the standard design in most installations, it