Types of Check Valves and Their Application Areas in Detail

Check valves play a vital role in industrial and civil fluid systems, and there are many types of valves with different applications.

In terms of structure type, common check valves are divided into two categories: swing-opening and lift-type. Rotary check valve is subdivided into single, double and multi-valve rotary. Among them, the single-valve rotary structure is relatively simple, suitable for small and medium-diameter pipelines and low-flow rate fluid system, such as common water supply and drainage pipelines, can effectively prevent water hammer phenomenon on the equipment damage. While the double and multi-valve swing check valve can cope with greater flow and pressure changes, usually used in large flow of industrial pipelines, such as chemical production in the liquid transportation pipeline.

Lift check valves are divided into two types: vertical and horizontal. Vertical lift check valve is suitable for vertical pipeline, especially in the hot water supply and other media from the bottom to the top of the flow of the system, such as thermal system, can effectively prevent the backflow of hot water. Horizontal lift check valve is suitable for horizontal pipeline, commonly used in large oil and gas pipeline branch connections to ensure the normal flow of media in the main pipeline.

Material-wise, there are different types of check valves such as cast iron, cast steel and stainless steel. Cast iron check valves have lower cost and are usually used in building water supply and drainage systems that do not require high corrosivity. Cast steel and stainless steel check valves can withstand higher pressures and temperatures, and has excellent corrosion resistance, so in the chemical industry, electric power and other industries, the nature of the medium requires strict occasions widely used.

Despite the variety of check valves, their core function has always been to prevent the backflow of fluids and ensure stable system operation. Different types of check valves are designed to better adapt to a variety of complex working conditions and media environment.