Question 1

What does API 602 cover and why is it different from API 600?

Accepted Answer

API 602 (Compact Gate Valves — Extended Body, Flanged, Threaded, Socket Welding, and Butt Welding Ends) covers compact forged steel gate valves in NPS ½ to 4 with wall ratings of Class 800 to Class 2500. API 600 covers full-bodied cast steel gate valves in NPS 2 and larger. The key difference is the construction method: API 602 valves are forged — the body is formed from solid forged bar or billet steel, which eliminates casting porosity and produces a denser, stronger grain structure. This makes API 602 forged valves the preferred specification for small-bore, high-pressure, and high-temperature applications where the superior mechanical properties of forged steel matter. API 602 forged valves in socket weld and threaded ends are the standard for NPS ½ to 1½ instrument root valves, sample connections, and block valves on process piping where API 600 cast steel valves are too large.

Question 2

What body materials are available for API 602 forged steel valves?

Accepted Answer

API 602 forged steel valves are available in: ASTM A105N (carbon steel, normalized) — the standard material for general-purpose hydrocarbon, water, steam, and process piping service at temperatures up to 425 °C; ASTM A182 F316 (forged 316 stainless steel) — for corrosive service, sea water, and process fluids requiring austenitic stainless steel; ASTM A182 F11 (1¼Cr-½Mo alloy steel) — for high-temperature service above 425 °C where carbon steel A105N reaches its temperature limit; and ASTM A182 F22 (2¼Cr-1Mo) — for hydrogen service and very high-temperature refinery applications. The 'N' suffix on A105N indicates the normalized heat treatment condition — required by most Saudi Aramco SAEP-347 Annex 4 material numbers for carbon steel forged valves.

Question 3

What end connections are available for API 602 forged valves and when is each used?

Accepted Answer

API 602 forged valves are available in socket weld (SW), threaded (NPT or BSPP), and butt weld (BW) end connections. Socket weld (Class 3000 and 6000) is the most common end connection for process piping NPS ½ to 2 in oil and gas applications — the valve bore is stepped to accept the pipe end, which is then fillet-welded. Threaded (Class 2000, 3000, 6000) is used for instrument root valves, sample connections, and utility piping where welding is not practical. Butt weld ends are used when the valve is integrated into welded piping systems at NPS 2 to 4. The ASME B16.11 pressure-temperature ratings for socket weld and threaded fittings use Class 2000/3000/6000 designations (not ASME flange Classes 150/300/600) — Class 6000 socket weld is approximately equivalent to ASME Class 1500 flanged pressure rating.

Question 4

Does SAEP-347 Annex 4 include API 602 forged steel valve material numbers?

Accepted Answer

Yes. SAEP-347 Annex 4 includes material numbers for API 602 forged steel gate valves in ASTM A105N (carbon steel normalized) at Class 800 through 2500, covering socket weld and threaded end connections in NPS ½ to 4. These are among the highest-volume material numbers in the Annex 4 list because small-bore instrument root valves, block valves, and gauge root valves appear on every process unit in Saudi Aramco's facilities. Gulf Union Ozone stocks API 602 A105N forged gate valves in Jeddah across the full SAEP-347 Annex 4 range — submit your material number and quantity for stock confirmation and pricing.

السمة	API 602	API 600
البناء	مطروق	مصبوب
نطاق الحجم	NPS ½ – 4	NPS 2 – 24+
نوع التوصيل	SW, NPT, BW, RF	RF, RTJ flanged
مادة الجسم	A105N, A182	A216 WCB, A351
الاستخدام الشائع	صمامات جذر، أجهزة	عزل الخط الرئيسي

صمامات فولاذية مطروقة API 602 في المملكة العربية السعودية — صمامات بوابة وكروية وفحص صغيرة الحجم

API 602 مقابل API 600 — مطروق مقابل مصبوب، صغير الحجم مقابل كبير الحجم

مخزون صمامات مطروقة API 602 — نطاق المواصفات الكامل

الأسئلة الأكثر شيوعاً — صمامات الفولاذ المطروق API 602

اطلب عرض سعر لصمامات مطروقة API 602 — A105N، مخزون في جدة