Introduction
Globe valves, sometimes referred to as stop valves or plug valves, are manually operated valves used to regulate or stop the flow of a liquid or gas. The flow of the liquid or gas is controlled by a disk, plug or globe which is moved with a hand wheel or lever. Globe valves are commonly found in many applications such as water and gas services, HVAC systems, boiler systems, and instrumentation. The purpose of the valves is to cut off, regulate, and control the flow of liquids and gas.
There are five common types of globe valves that are used in different applications. These are the Angle, Y-Pattern, Corrosive-Resistant, Non-Rising Stem, and Corrosion Resistant Globe Valves. Most manufacturers offer a wide range of standard sizes, materials, and styles in globe valves to meet all industrial requirements. The specifications of the globe valves are determined by the application, as each application may require different performance characteristics.
In general, globe valves are characterized by having a conical shape and the ability to be opened quickly and accurately. The design of a globe valve makes it ideal for use in processes that involve rapid changes in flow, as well as pumps, tanks, and vessels where tight shutoff is required.
Angle Globe Valves
Angle Globe valves have an angle body which helps to reduce turbulence when the valve is in the open position. This makes them suitable for applications where high pressures and temperatures are present. They have a disk that is angled 90 degrees with respect to the flow and generally require an actuator for manual operation.
Y-Pattern Globe Valves
Y-Pattern Globe valves are often referred to as three-way or multi-port valves. These valves are used when the flow has to be divided into several different channels. Furthermore, they can be used for manual operation or automated applications.
Corrosion Resistant Globe Valves
Corrosion resistant valves are designed to resist corrosion from chemical or environmental sources. These valves are typically made from a variety of materials including stainless steel, brass, or nickel as well as various elastomers depending on the application.
Non-Rising Stem Globe Valves
Non-Rising stem valves are typically used in applications where the pressure rating of a valve is high. This allows the valve to remain tightly shut while the pressure within a system remains high. Additionally, this type of valve can be used in applications that involve confined spaces.
Corrosion Resistant Globe Valves
Corrosion resistant valves are designed to resist corrosion from chemical or environmental sources. These valves are typically made from a variety of materials including stainless steel, brass, or nickel as well as various elastomers depending on the application.
Conclusion
Globe valves are available in a variety of sizes, materials, and styles to meet all industrial requirements. Each type of globe valve is suited for certain applications, depending on the type of flow, pressure rating, and environmental conditions of the process. The primary concern when selecting the type of valve is to make sure that the valve will function properly and provide the intended performance in the application.
