API 602 Forged Valve Manufacturer | ZECO Valvetriple eccentric butterfly valve

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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.
ItemApplicable Specification
Wall thicknessAPI 602
Pressure – temperature ratingsASME B16.34
General valve designAPI 602 & B16.34
End to End dimensionsASME B16.10
Flange designASME B16.5
Thread designASME B1.20.1
Butt Weld designASME B16.25
Socket Weld designASME 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 NumberDisc SurfacesSeat SurfacesStem Material
113Cr13CrASTM A182 F6a
218Cr-8Ni18Cr-8NiASTM A182 F304
325Cr-20Ni25Cr-20NiF310
5HF(Co-Cr A)HF(Co-Cr A)ASTM A182 F6a
813CrHF(Co-Cr A)ASTM A182 F6a
9MonelMonelMonel
1018Cr-8Ni-Mo18Cr-8Ni-MoASTM A182 F316
1218Cr-8Ni-MoHF(Co-Cr A)ASTM A182 F316
13Alloy 20Alloy 20Alloy 20
15HF(Co-Cr A)HF(Co-Cr A)ASTM A182 F304
16HF(Co-Cr A)HF(Co-Cr A)ASTM A182 F316

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