Industrial Valve Technical System Analysis: Classification Standards And Core Parameter Guide

As key control components in pipeline systems, the scientific selection of industrial valves directly impacts process safety. This article provides an in-depth analysis of the four major classification dimensions and key performance indicators for industrial valves, offering customized industrial valve solutions to the industry.

 

 

1. Functional Valve Group Classification

1.1 Medium Cutoff Devices

● Technical Definition: Terminal actuators that control the on/off flow of medium in pipelines.

● Typical Members: Parallel gate valves, conical shut-off valves, ball-type plug valves.

● Application Scenarios: Main pipeline cut-off for oil transportation, isolation control in chemical processes.

1.2 Medium Backflow Prevention Devices

Core Technology: One-way opening and closing mechanism design.

● Special Types: Swing check valves, lift check valves.

● Typical Application: Backflow prevention system for centrifugal pump inlets.

1.3 Pressure Safety Devices

● Safety Standards: Compliance with ASME/GB/T mandatory regulations.

● Core Parameters: Set pressure, reseating pressure differential, discharge coefficient.

● Configuration Requirements: Standard configuration for boiler pressure-bearing equipment.

 

2. Pressure Rating Certification System

2.1 Vacuum-grade Valves: Operating pressure differential < 101.325 kPa.

2.2 Conventional Pressure Range:

● Low-pressure Valves: PN ≤ 16 bar (Class 150).

● Medium-pressure Valves: PN 25-64 bar (Class 300-400).

● High-pressure Valves: PN 100-800 bar (Class 600-4500).

● Ultra-high Pressure Special Valves: PN ≥ 1000 bar (nuclear power primary loop systems).

 

3. Temperature Adaptation Spectrum

3.1 Cryogenic-grade Valves (-269°C to -100°C):

● Material Requirements: Special treatment of austenitic stainless steel.

3.2 Low-temperature Valves (-100°C to -40°C):

● Sealing Technology: Dual elastic sealing structure.

3.3 Standard Temperature Range Valves (-40°C to 120°C):

● Common Materials: WCB carbon steel / CF8 stainless steel.

3.4 High-temperature Special Valves (> 450°C):

● Special Configuration: Heat dissipation valve cover / chromium-molybdenum steel valve body.

By classifying temperature adaptability, industrial valve solutions can cover the full range of needs, from liquid hydrogen storage and transportation to molten salt systems.

 

4. Classification by Actuation Method

4.1 Automatic Valves: These valves operate without external power, relying on the energy of the medium itself. Examples include safety valves, pressure relief valves, drainage valves, check valves, and self-regulating valves. These form the basic units of intelligent industrial valve solutions.

4.2 Electric Valves: Electric valves can be driven by various power sources. They include:

● Electric Valves: Powered by electricity.

● Pneumatic Valves: Driven by compressed air.

● Hydraulic Valves: Driven by liquid pressure such as oil. Additionally, there are combinations of the above types, such as pneumatic-electric valves.

4.3 Manual Valves: Manual valves are operated using handwheels, handles, levers, or sprockets. When the valve's opening and closing torque is large, a gear or worm gear reducer can be added between the handwheel and valve stem. For remote operation, universal joints and drive shafts may also be used if necessary.

 

This technical guide provides a framework for building an industrial valve product system, assisting users in developing industrial valve solutions that meet ASME B16.34/GB/T 12224 standards and offering customized solutions for different operating conditions.