API 602 Close Die Forged Globe Valves

Description

API 602 Open Die Forged Globe Valves

Technical Data Sheet

1. Product Overview

This series of API 602 Open Die Forged Globe Valves features body and bonnet manufactured from solid forged steel using the open-die forging process. The forging ensures continuous grain flow, dense structure, and complete absence of casting defects, delivering excellent high-strength and impact resistance. Designed in strict accordance with API 602, these valves are suitable for severe service conditions in refineries, petrochemical, chemical, power generation, and oil & gas production applications, including high pressure, high temperature, or cryogenic environments. They are used for shut-off or throttling of pipeline media. The valves are available with bolted bonnet, welded bonnet, or pressure seal bonnet configurations to meet Class 150 through Class 1500 pressure ratings.

2. Design Features & Benefits

Open-Die Forged Body: Body and bonnet are formed from premium steel ingots via open-die forging, ensuring high material integrity and reliable mechanical properties.
Compact Construction: Outside Screw and Yoke (OS&Y) design positions stem threads outside the pressure boundary, protected from process media and allowing easy lubrication.
Blowout-Proof Stem: A stem shoulder prevents the stem from being ejected even under abnormal pressure conditions.
Replaceable Seat: The body seat can be integrally hardfaced or fitted with a replaceable seat ring for convenient field maintenance.
Reliable Sealing: Conical or spherical disc faces mate with flat or tapered seats, ensuring tight shut-off. Bonnet joint utilizes graphite/metallic spiral wound gaskets.
Low Operating Torque: Precision trapezoidal stem threads, with optional rolling element thrust bearings, provide ease of handwheel operation.
Multiple End Connections: Available with Flanged (RF/RTJ), Threaded (NPT/BSPT), Socket Weld (SW), and Butt Weld (BW) end connections.
Full Compliance: Capable of supplying EN 10204 Type 3.1 material certificates, API 607/6FA fire-safe certification, NACE MR0175 sour service, etc.
3. Technical Parameters

Item Specification Range
Nominal Diameter DN8 – DN50 (1/4″ – 2″)
Pressure Class Class 150 / 300 / 600 / 800 / 1500
Connection Type Flanged (RF/RTJ), Threaded NPT/BSPT, Socket Weld SW, Butt Weld BW
Operating Temperature Range -51°C to 425°C (-60°F to 797°F), dependent on body material & pressure
Low-temp down to -101°C (-150°F); high-temp up to 540°C (1004°F)
Body/Bonnet Material A105, LF2, F304, F316, F11, F22, F51, F53, etc.
Disc/Seat Sealing Face 13Cr / Stellite (STL) / Hardfacing (HF), etc.
Stem Material A276 410, A276 304, A276 316, A564 630 (17-4PH), Monel, etc.
Packing Flexible Graphite Rings (standard), PTFE (optional)
Operation Handwheel direct, Gearbox, Electric Actuator, Pneumatic Actuator
Design Standard API 602, ASME B16.34
End Connection Standards Flanges: ASME B16.5; Weld Ends: ASME B16.25; Threaded: ASME B1.20.1
Testing Standard API 598 (Zero Leakage)
Pressure-Temperature Basis ASME B16.34
4. Bill of Materials (Typical Configuration Class 800)

No. Component Standard Material Optional Material
1 Body ASTM A105 LF2, F316, F11, F22, F51
2 Bonnet ASTM A105 Same as above
3 Disc ASTM A105 + STL face F316 + STL face
4 Stem ASTM A276 410 A276 316, 17-4PH
5 Seat Ring ASTM A105 + STL face Integral hardfaced or same as body
6 Bonnet Gasket Flexible Graphite + SS316 Spiral Wound Graphite composite
7 Packing Flexible Graphite Rings PTFE-impregnated Graphite
8 Gland ASTM A276 410 A276 316
9 Stem Nut High-strength Copper Alloy (ASTM B148 C95200) Ductile Iron (lubricated)
10 Handwheel Malleable Iron / Carbon Steel Stainless Steel
5. Bonnet Styles

In accordance with API 602, the following bonnet configurations are available:

Bolted Bonnet: For Class 150/300/600. Ease of maintenance.
Welded Bonnet: For Class 800/1500. Eliminates external leak path; suitable for high pressure, toxic, or flammable media.
Pressure Seal Bonnet: Optional for Class 600 and above in larger sizes. Self-sealing under system pressure.
6. Dimensions & Weights (Example: Class 800 Flanged/Socket Weld/Threaded Globe Valves)

DN NPS End Type Face-to-Face L (mm) Center to Top H (mm) Handwheel Dia. Ø (mm) Approx. Weight (kg)
8 1/4″ Threaded/SW 73 140 75 0.8
10 3/8″ Threaded/SW 82 150 80 1.1
15 1/2″ Threaded/SW 88 165 90 1.5
20 3/4″ Threaded/SW 98 175 100 2.0
25 1″ Threaded/SW/Flanged 114 (Flgd) / 108 195 115 3.0
32 1-1/4″ Threaded/SW/Flanged 121 / 117 210 125 4.0
40 1-1/2″ Threaded/SW/Flanged 133 / 127 235 140 5.5
50 2″ Threaded/SW/Flanged 152 / 140 270 160 8.0
*Note: Flanged end face-to-face dimensions are per ASME B16.10 (long or short pattern available). SW/Threaded end dimensions conform to API 602. Height (H) is approximate for direct handwheel operation; gearbox or actuator will add to the height.*

7. Applicable Standards

Item Standard
Valve Design API 602, ASME B16.34
Flange Ends ASME B16.5
Butt Weld Ends ASME B16.25
Socket Weld & Threaded Ends ASME B16.11 / ASME B1.20.1
Inspection & Testing API 598
Pressure-Temperature Ratings ASME B16.34
Materials Respective ASTM standards
Fire Safe (Optional) API 607 / API 6FA
Sour Service (Optional) NACE MR0175 / ISO 15156
8. Installation & Maintenance Instructions

Verify that the valve nameplate pressure, temperature, and materials are compatible with the process pipeline before installation.
Standard globe valves are designed for “low inlet, high outlet” flow direction. Install with the flow arrow on the body aligned with the line media direction.
For flanged connections, tighten bolts evenly and diagonally to avoid undue stress.
If the packing gland leaks, the nuts can be evenly tightened while the line is under pressure. Do not over-compress. To replace packing, the pipeline must be depressurized.
Welded bonnet valves have no body-bonnet gasket leakage point. When the seat is worn, refurbish through the bonnet access port (if provided) or replace trim entirely. After repair, pressure test per API 598.
9. Ordering Information

Please provide the following parameters for accurate selection:

Nominal diameter and pressure class (e.g., DN25 Class 800)
Body/Bonnet material (e.g., A105, F316)
Connection type and standard (Flanged/Threaded/SW/BW)
Seat and disc sealing face material (13Cr/STL/HF)
Bonnet style (Bolted/Welded/Pressure Seal)
Operation type and actuator requirements
Media type, operating temperature, and pressure
Special certification requirements (e.g., NACE, API 607, EN 10204 3.1, PED, etc.)
Ordering Example: GFV-A602-CL800-DN25-A105-TRI-STL-BOLT-HW
Denotes an API 602 Open Die Forged Globe Valve, Class 800, DN25, A105 body, 13Cr trim, Bolted Bonnet, Handwheel operated.