Globe Valves — API 623 & API 602

What is a Globe Valve?

In a globe valve a disc moves perpendicular to a seat set inside a spherical body, and flow turns through the body around the seat. The stroke is short and the disc position controls flow closely, so globe valves are used for throttling and frequent operation. The cost is higher pressure drop than a gate valve. Typical uses are steam control, bypass, drain and vent lines, and feedwater regulation. Y-pattern and angle bodies reduce pressure drop.

Key features

• API 623 bolted bonnet cast steel globe valves NPS 2–24
• API 602 forged globe valves NPS ¼–4 including Class 800
• Plug, needle or ball-type disc; T, Y and angle patterns
• Hard-faced seats for steam and high-temperature service
• Pressure-seal bonnet for high classes on request

Specification

Applications

• Steam and condensate control
• Boiler feedwater and drain lines
• Bypass lines around control valves
• Fuel oil and gas regulation
• Vents and sampling points

Globe valve vs gate valve

A gate valve is for isolation: fully open it has a straight bore and low pressure drop, but it cannot throttle. A globe valve guides flow through a seat and gives close flow control with a short stroke, at the cost of higher pressure drop. Choose globe valves for throttling, frequent operation and steam service; gate valves for isolation in larger lines.