Valves are always an essential component in various piping systems. They control the flow of media within pipelines and equipment, and regulate the flow rate. So, how do you choose the right stainless steel valve for a piping system?

I. Consider the application requirements

There are many types of piping valves, categorized by structural features, application, actuation method, pressure capacity, nominal diameter, etc. For ease of selection, the most common classification method customers refer to is by the valve's application. Pipeline valves can be classified by application into shut-off valves, throttling valves, distribution valves, check valves, safety valves, and special-purpose stainless steel valves.

II. Consider the working conditions

Valves have a wide range of applications. Under various working conditions, the pressure on the valve sealing surface varies; some operate under vacuum, while others operate under ultra-high pressure. Often, the sealing surface also experiences compression and shear forces. Ambient temperatures also vary greatly, ranging from -270 degrees Celsius to as high as 800 degrees Celsius. For valves used in pipeline systems in the chemical industry, the corrosiveness of the medium must also be considered. From non-corrosive fluids to various strong acids and alkalis, and the wear and tear caused by media particles, valves are specifically designed for these applications.

III. Consider the Media

Valves can be used in various pipeline systems and for controlling various media, most commonly fluids, but also solids and gases. Therefore, considering the media is an important factor when selecting valves.

Stainless steel valves used in different applications and operating environments have different structures and materials. For example, valves for pipeline systems operating at temperatures above 300℃ are typically made of high-temperature resistant steel.

Three prerequisites for choosing stainless steel valves, and three things to note after installation

Stainless steel valves have many applications. Compared to pneumatic ball valves and electric butterfly valves, which are mainly used to regulate and control fluid flow, stainless steel valves can also be used for controlling fluids such as steam and air. So, how should they be installed?

I. Pre-installation Inspection

Incorrect or non-standard installation will definitely affect the performance. The first thing we need to do is to conduct a pre-installation inspection, because valves may be damaged by impacts during transportation, so necessary inspections are very important. The main inspection items include verifying that the model is correct, checking for damage or misalignment of the valve and valve stem, checking and removing debris from inside the valve, and ensuring that the rope is tied to the flange when lifting the valve.

II. Installation Precautions

Because ceramic valves and other valves made of brittle materials are easily damaged and cracked under pressure due to their low strength, stainless steel valves are often preferred. However, to reduce the pressure on the valve and extend its service life, a suitable gap should still be left during installation, ensuring that the valve flange and the pipe flange are parallel. Before spot welding or electric welding, all closing parts of the stainless steel valve must be fully opened.

III. Pipeline Cleaning

In practical applications of stainless steel valves, not all pipe connections are of the same diameter. Smaller valves are more prone to clogging by foreign objects and debris, so timely cleaning after installation is essential.

Furthermore, care must be taken when filling stainless steel valves with sealing material to avoid introducing debris into the pipeline. Thorough pipeline cleaning afterwards is also crucial; otherwise, residue buildup can prevent the valve from functioning properly.

If you would like to find out more about valves or purchase other products, please contact us at fluid@weitengroup.com, wwww.weitengroup.com.