CN

News

Location： Home  /  News  /  Industry Dynamics
Analysis of International Standards for Valves and Selection of Valves

2026-06-18

Analysis of International Standards for Valves and Selection of Valves

A comparative analysis of international standards for valves and an exploration of their selection involve multiple aspects, including the history, current status, standard content of different standard-setting bodies, and the considerations when choosing. Here is a detailed analysis of this topic: I. Main Valve Standards Development Institutions 1. International Organization for Standardization (ISO) History and Current Situation: ISO is a global non-governm

How to conduct pressure tests on various industrial valves? The methods are here.

2026-06-18

How to conduct pressure tests on various industrial valves? The methods are here.

Detailed Explanation of Various Industrial Valve Pressure Testing Methods The pressure test of industrial valves is a crucial step to ensure their performance and safety. Due to the structural differences among various types of valves, specific pressure testing methods need to be adopted. Based on general principles and specific valve types, the following provides a complete pressure test operation guide: I. General Pressure Testing Prin

The working principle and structural features of the American standard stop valve

2026-06-18

The working principle and structural features of the American standard stop valve

The core principle of the American standard stop valve (Class pound-level stop valve) is the same as that of the domestic stop valve, both of which **use the valve disc to lift and close or open the medium**. However, the structure is designed according to ASME B16.10 and B16.34, making it more suitable for high-temperature, high-pressure, and harsh working conditions. I. Working Principle 1. Handwheel/actuator drives the stem up and down. 2. The lower end of the valve s

How often is the valve maintenance scheduled?

2026-06-18

How often is the valve maintenance scheduled?

The maintenance cycle of valves is not fixed and is influenced by various factors, including the type of valve, usage frequency, working environment, material, and the quality of maintenance. Here are some general guidelines for the maintenance cycle of valves: I. General Maintenance Cycle 1. Routine inspection and maintenance: For valves in general thermal systems, it is recommended to conduct a routine inspection and maintenance at least once a year. This includes checking the appearance of the valve, its sealing performance, operational flexibility, and whether the fasteners are loose. After the heating season ends, a comprehensive inspection of

Why are sealing devices required for gate valves and globe valves?

2026-06-18

Why are sealing devices required for gate valves and globe valves?

Four Core Reasons Why Gate & Globe Valves Must Be Equipped with a Back Seat 1. Isolate Medium Pressure to Protect Packing and Extend Service Life Gate and globe valves adopt **rising stem design**. When fully open, the conical/spherical surface on the stem shoulder seals tightly against the back seat in the bonnet, forming an independent metal seal that blocks the path from the valve body to the packing gland.

What should be noted during the installation and maintenance of stainless steel valves?

2026-06-18

What should be noted during the installation and maintenance of stainless steel valves?

I. Installation Precautions 1. Distinguish the flow direction and do not reverse it On the valve bodies of stop valves, check valves and throttle valves, there are flow direction arrows. They must be consistent with the direction of the medium flow. Gate valves and ball valves are generally bidirectional and usable in both directions, but those with guide holes should be noted for the correct direction. 2. Prohibit forceful kissing and forcibly twisting the pipe The stainless steel material is hard but brittle. If the flange is forcibly aligned, and the pipeline stress is too high, it is likely to cause the valve body to be pulled apart and the flange to deform, resulting in the failure of the seal.

 
 
 
Home
Products
Contact