Forged Steel Globe Valve Technical Data Sheet

(API 602, Socket Weld Ends)

1. Product Overview

Product Type: Forged Steel Globe Valve
Design Standard: API 602 (ISO 15761, BS 5352, ASME B16.34)
Connection Type: Socket Weld Ends (SW) per ASME B16.11
Operation: Manual (Handwheel Operated)
Bonnet Type: Bolted Bonnet / Welded Bonnet (optional)
Structure Type: OS&Y (Outside Screw and Yoke), Rising Stem
Nominal Size: NPS 1/2″ ~ 2″ (DN15 ~ DN50)
Pressure Class: Class 150 ~ Class 2500 (PN20 ~ PN420)
End Preparation: Socket weld ends per ASME B16.11
Face-to-Face Dimensions: ASME B16.10 / API 602
Testing Standard: API 598 / ISO 15761
Pressure-Temperature Rating: ASME B16.34

2. Applicable Standards & Specifications

3. Main Technical Parameters

4. Material of Construction

4.1 Standard Material Combinations by Temperature/Pressure Class

4.2 Trim Options (Per API 602)

5. Structural Features & Design Highlights

5.1 Forged Construction

• Superior Material Properties: Body and bonnet are manufactured from forged steel (ASTM A105, A182 F22, F316L, etc.), providing superior strength, uniformity, and reliability compared to castings .

• Grain Structure: Forging process aligns grain structure for enhanced mechanical properties and pressure retention .

• Non-Destructive Testing: 100% material traceability and optional NDT (UT, MT, PT) available .

5.2 API 602 Compliant Design

• Compact Design: Designed to API 602 requirements with optimized wall thickness and compact face-to-face dimensions .

• Pressure Class Coverage: Full compliance for Class 150 through Class 2500 .

• End-to-End Dimensions: Meets API 602 short pattern or ASME B16.10 long pattern as specified .

5.3 Socket Weld End Connections (ASME B16.11)

• Socket Dimensions: Precision machined socket weld ends per ASME B16.11 for reliable pipe insertion and welding .

• Socket Depth: Standard socket depth accommodates proper pipe insertion with expansion gap .

• Wall Thickness: Socket dimensions match pressure class requirements .

• Material Compatibility: End material matches body material for weld compatibility .

• Socket Weld Features:

  • Socket bore diameter per ASME B16.11

  • Minimum 1/16″ (1.6 mm) expansion gap at bottom of socket

  • Fillet weld at pipe-socket junction

5.4 Bonnet Design Options

5.5 Stem and Disc Features

• OS&Y Rising Stem: Outside screw and yoke design with rising stem provides visual position indication; stem threads are outside the valve body, protected from media .

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

• Backseat Design: Integral backseat in bonnet allows packing replacement under pressure when valve is fully open .

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

• Plug-Type Disc: Provides better throttling characteristics and improved sealing .

5.6 Seating Surfaces

• Integral Seat: Seat is integral to body for maximum strength and reliability .

• Hardfacing: Seating surfaces can be overlaid with Stellite or other hard alloys (per trim specification) .

• Precision Ground: Seats and discs are precision ground and lapped to achieve bubble-tight shut-off .

5.7 Packing and Sealing

• Packing Material: Flexible graphite or PTFE rings with anti-extrusion rings .

• Live-Loaded Option: Belleville springs available to maintain constant packing stress and compensate for thermal cycling .

• Low Emission Packing: Optional packing sets meet ISO 15848 and TA-Luft requirements .

6. Dimensional Data

6.1 Socket Weld End Dimensions (Per ASME B16.11)

6.2 Face-to-Face Dimensions (L) – API 602 Short Pattern / ASME B16.10

Note: Dimensions are for reference. Long pattern per ASME B16.10 also available.

6.3 Overall Dimensions (Approximate) – Bolted Bonnet Design

Note: Dimensions vary by manufacturer and pressure class. For welded bonnet designs, height may be reduced.

7. Testing & Inspection (Per API 598 / API 602)

Optional Tests:

• NDT (Non-Destructive Testing): UT, MT, PT on body/bonnet

• PMI (Positive Material Identification)

• Hydrostatic test with traceable chart recorder

• Low emission test per ISO 15848

• Fire-safe test per API 607

8. Installation, Operation & Maintenance Instructions

8.1 Pre-Installation

• Remove protective covers from socket weld ends .

• Clean valve interior to remove any debris, oil, or preservatives .

• Verify pressure class, material, and trim match service requirements .

• Check handwheel operation (full open/close) to ensure smooth stem movement .

• Inspect socket weld ends for damage .

8.2 Installation (Socket Weld Connections)

• Socket Weld Preparation:

  • Clean socket bore and pipe end thoroughly; remove oil, grease, and moisture .

  • Ensure pipe end is cut square and deburred .

• Pipe Insertion:

  • Insert pipe fully into socket (bottom contact) .

  • Withdraw pipe approximately 1/16″ (1.6 mm) to provide expansion gap at bottom of socket .

  • This gap prevents stress concentration during thermal expansion .

• Tack Welding:

  • Tack weld in at least two places to hold pipe in position .

  • Verify pipe position and expansion gap maintained .

• Welding:

  • Valve should be in fully open position during welding to protect seat and disc from heat damage .

  • Use qualified welding procedure (WPS) and welders .

  • Apply fillet weld around pipe-socket junction .

  • Weld size per code requirements (typically 1.25 x pipe wall thickness) .

  • Maintain proper interpass temperature .

• Post-Weld Heat Treatment (PWHT) :

  • Required for certain materials and thicknesses per code .

  • PWHT should be performed with valve in fully open position .

• System Cleanliness:

  • After welding, purge lines to remove weld slag and debris before commissioning .

8.3 Operation

• Handwheel Rotation: Turn handwheel clockwise to close, counter-clockwise to open .

• Position Indication: Rising stem provides visual indication of valve position (stem up = valve open) .

• Operating Torque: Do not use excessive force or pipe extensions on handwheel .

• Throttling Service: Globe valves are suitable for throttling; avoid operating in high-pressure drop conditions that may cause erosion .

• Backseat: When valve is fully open, stem backseat engages to protect packing .

8.4 Maintenance

• Periodic Inspection:

  • Check packing for leakage; if slight leakage occurs, evenly tighten gland nuts .

  • Lubricate stem threads periodically for smooth operation .

• Packing Replacement:

  • Valve can be repacked under pressure when fully open (backseat engaged) .

  • Remove old packing, clean stuffing box, install new packing rings .

  • Replace gland follower and tighten evenly .

• Major Repair:

  • Depressurize valve and allow to cool before disassembly .

  • Remove bonnet bolts and lift bonnet/stem assembly .

  • Inspect seat and disc for damage; lap or machine as required .

  • Replace gasket with new spiral wound gasket .

  • Reassemble and torque bonnet bolts to specification .

  • Retest valve per API 598 before returning to service .

9. Ordering Information

When ordering API 602 Forged Steel Globe Valves with Socket Weld Ends, please specify:

1. Valve Type: Forged Steel Globe Valve, API 602

2. Nominal Size: NPS ___ (DN ___)

3. Pressure Class: Class ___ (150/300/600/800/900/1500/2500)

4. Body Material: ASTM A105 / A350 LF2 / A182 F304 / F316 / F11 / F22

5. Trim Material: Trim ___ (1/2/3/4/5/8/12/13) per API 600/602

6. Connection Type: Socket Weld Ends (SW) per ASME B16.11

7. Bonnet Type: Bolted Bonnet / Welded Bonnet

8. Disc Type: Plug-type / Conventional

9. Flow Direction: Flow under seat / Flow over seat

10. Face-to-Face Standard: API 602 Short Pattern / ASME B16.10 Long Pattern

11. Special Requirements:

    • NACE MR0175 / ISO 15156 compliance

    • NDT (UT/MT/PT) requirements

    • PMI testing

    • Low emission packing (ISO 15848 / TA-Luft)

    • Special welding procedures / PWHT requirements

    • Extended stem or special configuration

    • Positive Material Identification (PMI) report

12. Quantity Required: ___ units

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