API 602 Valve Size Reference and Dimensions Guide

Introduction
API 602 is the international standard for compact forged steel gate, globe, and check valves, commonly used in oil & gas pipelines, chemical plants, and high-pressure applications. These valves are designed for small-bore piping systems, providing durability, reliability, and resistance to high pressure and temperature.

This guide provides a comprehensive API 602 valve size chart with NPS/DN conversion, pressure classes, and key notes for valve selection.

Scope of API 602

Valve Types: Gate valves, globe valves, and check valves.
Size Range: NPS 1/4" – 4" (DN 6 – DN 100).
Pressure Ratings: Class 150, 300, 600, 800, 900, 1500 (some designs up to 2500).
Materials: Forged carbon steel (A105), low alloy steel (F11, F22), stainless steel (F304, F316), and special alloys.
End Connections: Threaded (NPT), Socket Weld (SW), Butt Weld (BW), Flanged.

API 602 Valve Size Reference Table

NPS (inch)	DN (mm)	Typical Pressure Class	Common End Connections	Applications
1/4"	DN 6	Class 150 – 1500	SW / NPT	Instrument lines, sampling
3/8"	DN 10	Class 150 – 1500	SW / NPT	Control piping
1/2"	DN 15	Class 150 – 2500	SW / NPT / BW	Chemical process piping
3/4"	DN 20	Class 150 – 2500	SW / NPT / BW	Steam, oil lines
1"	DN 25	Class 150 – 2500	SW / BW / Flanged	Refinery & chemical plants
1 1/4"	DN 32	Class 150 – 2500	SW / BW / Flanged	High-pressure piping
1 1/2"	DN 40	Class 150 – 2500	SW / BW / Flanged	Process control
2"	DN 50	Class 150 – 2500	SW / BW / Flanged	Oil & gas pipelines
2 1/2"	DN 65	Class 150 – 1500	BW / Flanged	Utility lines
3"	DN 80	Class 150 – 1500	BW / Flanged	Small bore pipeline isolation
4"	DN 100	Class 150 – 1500	BW / Flanged	Maximum size under API 602

Why Use API 602 Valves?

Compact Design: Saves space in tight piping systems.
High Pressure Resistance: Suitable for Class 2500 service.
Forged Steel Strength: Superior to cast steel for small sizes.
Versatile Connections: Available in threaded, socket weld, butt weld, and flanged ends.
Industry Applications: Oil & gas, petrochemical, power plants, refineries, steam service, and chemical processing.

Installation Notes

Always flush the pipeline before valve installation to prevent seat damage.
For socket weld ends, follow correct welding procedures to avoid overheating seals.
Tighten flange bolts in a crisscross pattern for even sealing.
Ensure stem packing is properly compressed to prevent leakage.
Conduct hydrostatic and seat leak tests before commissioning.

Conclusion
API 602 valves are the industry standard for small-bore, high-pressure service. By understanding the size range, pressure ratings, and installation guidelines, engineers and plant operators can select the right valve for safe and reliable operation.

Keywords: API 602 valve size chart, API 602 gate valve dimensions, forged steel valve sizes, compact valve standard, API 602 globe valve reference, industrial valve selection guide.

Meta Description: API 602 valve size chart and dimensions for gate, globe, and check valves. Covers NPS 1/4" to 4" (DN 6–100) with pressure classes up to 2500.

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