Valve Standard Reference
API 602
AmericanGate, Globe, and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries
API 602 covers compact forged steel gate, globe, and check valves in sizes NPS 1½ and smaller for petroleum and natural gas service.
Overview — API 602
API 602 covers compact forged steel gate, globe, and check valves in sizes NPS 1½ and smaller for petroleum and natural gas service. Unlike API 600 which governs cast steel large-bore gate valves, API 602 addresses the small bore segment where forged construction is standard and compact face-to-face dimensions save weight and cost. API 602 valves are ubiquitous in instrument root valve, bypass, sample valve, and small utility applications.
Scope
Applies to forged and bar-stock carbon steel, alloy steel, and stainless steel gate, globe, angle, and check valves NPS 1½ (DN 40) and smaller in pressure classes 800, 1500, and 2500. Threaded, socket weld, and butt-weld end connections. Covers both integral and flanged bonnets.
Applicable Valve Types
Gate Valves — small bore, NPS ½ to 1½
Globe Valves — small bore, NPS ½ to 1½
Check Valves — piston and swing type, small bore
Applicable Pressure Classes
Key Requirements — API 602
Forged or bar-stock steel body — no cast steel for small-bore API 602 service
Reduced face-to-face dimensions compared to ASME B16.10 (compact design)
Class 800 (PN 138) suitable for most utility and instrument root valve applications
Class 1500 and 2500 available for high-pressure gas service
Blowout-proof stem design required
Integral body seat or renewable seat ring options
Packing gland accessible without removing valve from line
Testing Requirements — API 602
Shell test: 1.5× cold working pressure
Seat leakage test: 1.1× cold working pressure
Back seat test per API 598
Documentation Required for API 602 Compliance
Material Test Reports (MTR) — 3.1 certification
Pressure test certificate
Dimensional inspection report
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