A globe valve is a linear motion valve used to stop, start, and regulate the fluid flow. The globe valve disk can be removed entirely from the flow path, or it can completely close the flow path. During opening and closing of globe valve, disc moves perpendicularly to the seat.
This movement creates the annular space between the disk and seat ring that gradually close as the valve closed. This characteristic provides the globe valve good throttling ability required for regulating the flow.
Leakage from globe valve seat is less as compared to the gate valve, mainly due to right angle contact between the disk and seat ring, which allows tighter seal between seat the disk.
Globe valves can be arranged in a such a way that the disk closes against the flow or in the same direction of flow.
When the disk closes in the direction of flow, the kinetic energy of the fluid helps closing but obstructs opening. This characteristic is preferable when a quick-acting stop is required.
When the disk closes against the direction of flow, the kinetic energy of the fluid obstructs closing but helps to open the valve. This characteristic is preferable when quick-acting start is required.
Globe Valves are used in the systems where flow control is required and leak tightness is also important.
1 It used in high-point vents and low-point drains when leak tightness and safety are major concerns. Otherwise, you can use gate valve for drain and vent.
2 It can be used in Feed-water, chemical, air, lube oil and almost all services where pressure drop is not an issue
3 This valve is also used as an automatic control valve, but in that case, the stem of the valve is a smooth stem rather than threaded and are opened and closed by lifting action of an actuator assembly.