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ZECO Valve provides forged steel API 602 forged valves in sizes 4″ and smaller for natural gas and petroleum industries, as well as power plant services. Pressure designation: includes Class 150, Class 300, Class 600, Class 800, Class 900 and Class 1500. Size range: 1/4″(DN 8) ~ 4″(DN 100).
Table of Contents
- What is API 602 Standard?
- Product Overview of API 602 Forged Valve
- Design of API 602 Forged Valve
- Trim Material Selection of API 602 Forged Valve
What is API 602 Standard?
This International Standard specifies the requirements for a series of compact steel gate, globe and check valves for petroleum and natural gas industry applications.
It is applicable to valves of
- nominal sizes DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 and 100,
- corresponding to nominal pipe sizes NPS ¼, ⅜, ½, ¾, 1, 1¼, 1½, 2, 2½, 3 and 4,
and to pressure designations of Class 150, Class 300, Class 600, Class 800 and Class 1500.
Product Overview of API 602 Forged Valve
- Design Standards: API 602, ISO 15761, BS5351;
- End Connections: Butt Welding(BW)-ASME B16.25, Socket Welding(SW)-ASME B16.11, Threaded-ASME B1.20.1;
- Hydraulic and Air Test: API 598;
- Pressure & Ratings: ASME B16.34.
| Item | Applicable Specification |
| Wall thickness | API 602 |
| Pressure – temperature ratings | ASME B16.34 |
| General valve design | API 602 & B16.34 |
| End to End dimensions | ASME B16.10 |
| Flange design | ASME B16.5 |
| Thread design | ASME B1.20.1 |
| Butt Weld design | ASME B16.25 |
| Socket Weld design | ASME B16.11 |
Design of API 602 Forged Valve
- Bolted bonnet, welded bonnet, pressure sealed bonnet;
- Fully guided one-piece solid wedge to reduce wear on seating surfaces;
- Effective back seating design and packing mechanism to ensure a tight stem seal; outside screw and yoke(OS&Y) with rising stem;
- Tee-head stem design to prevent the stem from becoming disengaged from the wedge while the valve is in service.
- Half grooved/ recessed body-bonnet joint design to accommodate spiral wound stainless steel gasket for tight body-bonnet sealing.
- Hard-faced surfaces of both seating rings and the wedge provide excellent wear resistance.
Trim Material Selection of API 602 Forged Valve
| Trim Number | Disc Surfaces | Seat Surfaces | Stem Material |
| 1 | 13Cr | 13Cr | ASTM A182 F6a |
| 2 | 18Cr-8Ni | 18Cr-8Ni | ASTM A182 F304 |
| 3 | 25Cr-20Ni | 25Cr-20Ni | F310 |
| 5 | HF(Co-Cr A) | HF(Co-Cr A) | ASTM A182 F6a |
| 8 | 13Cr | HF(Co-Cr A) | ASTM A182 F6a |
| 9 | Monel | Monel | Monel |
| 10 | 18Cr-8Ni-Mo | 18Cr-8Ni-Mo | ASTM A182 F316 |
| 12 | 18Cr-8Ni-Mo | HF(Co-Cr A) | ASTM A182 F316 |
| 13 | Alloy 20 | Alloy 20 | Alloy 20 |
| 15 | HF(Co-Cr A) | HF(Co-Cr A) | ASTM A182 F304 |
| 16 | HF(Co-Cr A) | HF(Co-Cr A) | ASTM A182 F316 |
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