A globe valve uses a linear motion for moving a disc (closure member) into or out of the seating surface. Globe Valves form a globular shaped cavity around the port region and hence the name. The disc can be of various shape and moves perpendicular to the globe valve seat. This disc movement helps in the valve opening and closure. Globe valves in general are used for pipes of size 8 inches or less. In this article, we will explore the globe valve types, parts, working principle, function, symbol, application, advantages, and disadvantages.
Types of Globe Valve
Three types of globe valves are available for industrial use.
Tee Pattern (T-Type) Globe valves possess the lowest flow coefficient and a higher pressure drop. In severe throttling services, such globe valves can be used. If the pressure drop is not a concern and throttling is required, the Tee type globe valve will be a good choice.
Wye Pattern Globe valves can be cracked open for long periods without severe erosion. They offer very low resistance to flow. For start-up operations, Y-type globe valves are extensively used.
Angle Pattern Globe valves turn the fluid flow in a perpendicular direction without the use of an elbow. For pulsating flow services, angle type globe valves are used because of their capability of handling the slugging effect.
Advantages of Globe Valve
The main advantages of globe valves can be summarized as follows:
- Good sealing capability
- Moderate to good throttling capability
- Shorter stroke
- Provide a wide range of capabilities as available in tee, Wye, and angle body styles.
- Machining and resurfacing of the seats are easy.
- The globe valve can be used as a stop-check valve by modifying the design slightly.