Description

API 602 Forged Steel Flanged Globe Valve Technical Data Sheet

1. Product Overview

Product Type: Forged Steel Flanged Globe Valve
Operation: Manual (Handwheel Operated)
Connection Type: Flanged Ends (RF / RTJ)
Bonnet Type: Bolted Bonnet / Welded Bonnet (optional)
Design Standard: API 602 (ISO 15761, BS 5352, ASME B16.34)
Nominal Size: NPS 1/2″ ~ 2″ (DN15 ~ DN50)
Pressure Class: Class 150 ~ Class 2500 (PN20 ~ PN420)
Structure Type: OS&Y (Outside Screw and Yoke), Rising Stem
End Flanges: ASME B16.5 (RF / RTJ)
Face-to-Face Dimensions: ASME B16.10
Testing Standard: API 598 / API 6D
Pressure-Temperature Rating: ASME B16.34

2. Applicable Standards & Specifications

3. Main Technical Parameters

4. Material of Construction

4.1 Standard Material Combinations

4.2 Trim Options

5. Structural Features & Design Highlights

• Forged Construction: Valve body and bonnet are manufactured from forged steel materials (ASTM A105, A182 F22, F316L, etc.), providing superior strength and uniformity compared to castings .

• API 602 Compliant Design: Designed, manufactured, and tested in full compliance with API 602 specification, ensuring reliability in high-pressure and high-temperature applications .

• Bolted Bonnet Design: Standard configuration with bolted bonnet and spiral wound gasket (ASME B16.20) for controlled compression and leak-free performance . Optional welded bonnet or pressure-seal bonnet available for higher pressure classes .

• OS&Y (Outside Screw and Yoke) Rising Stem: Provides visual indication of valve position. Stem threads are outside the valve body, protected from media, ensuring smooth operation and long service life .

• Integral Backseat Design: When fully open, the stem seals against a backseat in the bonnet, allowing packing replacement while the valve is under pressure .

• Hardfaced Seating Surfaces: Disc and seat sealing surfaces are overlaid with Stellite or other hard alloys, precision ground and lapped to achieve bubble-tight shut-off (ISO 5208 Class VI) .

• Swivel Disc Design: The disc is designed to swivel, ensuring precise alignment with the seat and preventing galling during closure .

• Anti-Blowout Stem: Stem is designed with an integral collar to prevent blowout under pressure .

• Multiple Connection Options: Available with flanged (RF/RTJ), threaded (NPT), socket weld, or butt weld ends to suit various piping requirements .

• Low Emission Packing: Optional low-emission packing available to meet ISO 15848 requirements .

6. Dimensional Data

6.1 Face-to-Face Dimensions (L) – RF Flanged Ends (ASME B16.10)

6.2 Overall Dimensions (Approximate) – Class 150~600

6.3 Dimensional Data – Class 1500/2500 (Self-Seal Bonnet)

7. Installation, Operation & Maintenance Instructions

1. Pre-Installation Inspection: Remove protective covers. Clean valve interior to remove debris. Inspect flange faces and gasket surfaces for damage. Operate valve fully open and closed to ensure smooth stem movement .

2. Installation:

   • Ensure pipeline is clean and free from debris.

   • Install valve with flow direction matching arrow on body (typically flow under seat for globe valves).

   • Use appropriate gaskets (spiral wound for RF, ring joint for RTJ flanges).

   • Support piping adequately to avoid stress on valve flanges.

   • Tighten flange bolts evenly in crisscross pattern to recommended torque.

3. Operation:

   • Rotate handwheel clockwise to close, counter-clockwise to open.

   • Do not use pipe extensions or hammers on handwheel for additional leverage.

   • For throttling applications, avoid operating in high-pressure drop conditions that may cause erosion.

   • Stem backseat when fully open to protect packing .

4. Maintenance:

   • Periodic inspection of packing for leakage; adjust gland nuts evenly if slight leakage occurs.

   • For major repairs, depressurize valve before disassembly.

   • Replacement parts should be OEM-sourced to maintain API 602 compliance.

   • Lubricate stem threads periodically for smooth operation.

8. Ordering Information

When ordering API 602 Forged Steel Flanged Globe Valves, please specify:

1. Valve model / type

2. Nominal size (NPS / DN)

3. Pressure class (Class)

4. Body material

5. Trim material

6. Connection type (RF/RTJ flanged)

7. End-to-end dimension (if special required)

8. Applicable medium and operating temperature

9. Special requirements (NACE, low emission packing, etc.)

10. Quantity required

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Note: This technical data sheet is a general guideline for API 602 Forged Steel Flanged Globe Valves. For specific project requirements, including detailed material selection, pressure class, and dimensions, please refer to the approved manufacturer’s drawing and purchase order. Specifications are subject to change without notice.