API 602 Forged Valve Manufacturer

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).

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