A Globe valve is a linear motion valve and is primarily designed to stop, start and regulate flow. The disk of a Globe valve can be totally removed from the flow path or it can completely close the flow path.

GET ADVANTAGES AND DISADVANTAGES OF GLOBE VALVES INFORMATION

Advantages and disadvantages of Globe valves

ADVANTAGES

• Good shutoff capability
• Moderate to good throttling capability
• Shorter stroke (compared to a gate valve)
• Available in tee, wye, and angle patterns, each offering unique capabilities
• Easy to machine or resurface the seats
• With the disc not attached to the stem, the valve can be used as a stop-check valve

DISADVANTAGES

• Higher pressure drop (compared to a gate valve)
• Requires greater force or a larger actuator to seat the valve (with pressure under the seat)
• Throttling flow under the seat and shutoff flow over the seat

Flow direction of Globe Valves

For applications with low temperatures, Globe valves are normally installed so that the pressure is under the disc. This contributes to an easy operation and helps protect the packing.

For applications with high-temperature steam service, Globe valves are installed so that the pressure is above the disk. Otherwise, the stem will contract upon cooling and tend to lift the disk off the seat.

Typical Applications of Globe valves

The following are some of the typical applications of Globe valves..

• Cooling water systems where flow needs to be regulated
• Fuel oil system where flow is regulated and leak tightness is of importance
• High-point vents and low-point drains when leak tightness and safety are major considerations
• Feedwater, chemical feed, condenser air extraction, and extraction drain systems
• Boiler vents and drains, main steam vents and drains, and heater drains
• Turbine seals and drains
• Turbine lube oil system and others