Question 1

What is a globe valve and when should I use it?

Accepted Answer

A globe valve uses a spherical or plug-shaped disc that moves perpendicularly to the seat to start or stop flow. Globe valves are the best choice for throttling and flow regulation applications because the disc movement is perpendicular to the seat, allowing precise flow control. They are ideal for applications requiring frequent operation, fine flow adjustment, or where bubble-tight sealing is critical.

Question 2

What is the difference between API 600 and API 602 globe valves?

Accepted Answer

API 600 covers steel globe valves (Bolted Bonnet) for general service. API 602 covers compact globe valves (wedge disc, needle, or cage) typically for smaller sizes and higher pressures. API 602 valves are usually limited to NPS 1/2 to 4 and Class 800 to 2500.

Question 3

What materials are available for globe valves?

Accepted Answer

Carbon Steel WCB/A216, Stainless Steel SS304/SS316/SS316L, Chrome Moly WC6/WC9, and Nickel Aluminium Bronze C95800 (NAB) for seawater service. Trim materials include SS316, Stellite 6, and Monel for seat and stem.

Question 4

Can globe valves be used for steam service?

Accepted Answer

Yes. Globe valves are excellent for steam service. The pressure seal or bolted bonnet design handles high-temperature steam effectively. For saturated steam, Carbon Steel WCB is standard. For superheated steam, Chrome Moly (WC6/WC9) is preferred.

Parameter	Specification
Standard	API 600 / API 602 / BS 1873 / ASME B16.34
Design	Outside Screw & Yoke (OS&Y), Bolted Bonnet, Pressure Seal Bonnet
Body Materials	A216 WCB, A352 LCB, A217 WC6, WC9, CF8M (SS316), C95800 (NAB)
Trim Materials	SS316, SS316L, Stellite 6, Monel, Alloy 6
End Connections	Flanged RF/RTJ (ASME B16.5), Butt Weld, Socket Weld, Threaded
Certifications	API 600 Monogram, CE/PED, SABER, IBR, EN 10204 3.1

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