TECHNICAL DATA SHEET
Product Name: 3/4-inch 2500LB Welded Bonnet Globe Valve
Model/Specification: 3/4″-2500LB-WELDED-GLOBE
Loại van: Welded Bonnet Globe Valve (Forged)
Connection Type: Socket Weld (SW) / Butt Weld (BW) / Threaded (NPT) User specified
- Basic Design Parameters
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Tham số
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Standard/Specification
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Kích cỡ
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3/4 inch (DN20)
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Pressure Class
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Class 2500 LB (PN420 / 6000 PSI)
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Vật liệu thân máy
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Forged Carbon Steel (A105) / Forged Stainless Steel (A182 F304/F316) / Alloy Steel (F22) User specified
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Manufacturing Process
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Close Die Forged Steel
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Design Standard
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API 602 / ASME B16.34 / BS 5352
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Bonnet Type
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Welded Bonnet (Threaded-in and strength-welded)
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End Connection Standard
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ASME B16.11 (SW) / ASME B16.25 (BW) / ASME B1.20.1 (NPT)
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Face to Face Standard
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ASME B16.10
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Test & Inspection Std.
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API 598
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- Technical Specifications
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Tham số
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Details
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Loại van
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Straight Pattern Globe Valve, Forged Construction
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Bonnet Type
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Welded Bonnet – Threaded-in and seal welded for zero leakage
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Stem Type
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Outside Screw and Yoke (OS&Y), Rising Stem
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Disc Type
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Parabolic / Needle-type Disc (for throttling)
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Seat Type
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Integral Seat (hardfaced optional)
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Applicable Media
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Steam, Water, Oil, Gas, Corrosive Fluids (depending on material)
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Phạm vi nhiệt độ
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-29°C to +550°C (depending on material)
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Flow Direction
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Flow under disc (standard)
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Hoạt động
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Handwheel (standard) / Gear / Actuator
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Backseat Design
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Standard (protects packing when fully open)
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- Material of Construction (Recommended – Carbon Steel A105)
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Part Name
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Vật liệu
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Standard/Grade
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Thân hình
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Forged Carbon Steel
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ASTM A105
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Bonnet
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Forged Carbon Steel
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ASTM A105
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Disc / Valve Plug
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Stainless Steel + Hardfacing
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13Cr / F304 + Stellite (optional)
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Seat Ring
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Integral Seat (Hardfaced optional)
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13Cr / F304
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Thân cây
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Stainless Steel
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ASTM A182 F6a (13Cr) / F304
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Gasket
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None (Welded Bonnet – no gasket)
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—
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Packing
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Flexible Graphite / PTFE
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Low sulfur graphite
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Stem Nut
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Aluminum Bronze
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C95400 / CuAl10Fe3
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Body Bolts/Nuts
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None (Welded Bonnet)
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—
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Handwheel
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Malleable Iron / Carbon Steel
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ASTM A197
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*For Stainless Steel version (A182 F304/F316): body/bonnet to SS, disc/stem to SS.*
- Main Dimensions & Connection Details
*Note: Dimensions for 3/4″ Class 2500 Welded Bonnet Globe Valve with Socket Weld Ends. Based on API 602 and industry standards .*
4.1 End-to-End Dimensions (Face-to-Face – Socket Weld)
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Kích cỡ
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Pressure Class
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L (mm)
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L (in)
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H (Open) mm
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H (Open) in
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W (Handwheel) mm
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Weight (kg)
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Weight (lbs)
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3/4″
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2500LB
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92
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3.62
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~171
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~6.73
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100
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~1.9
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~4.2
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Note: Welded bonnet version is slightly lighter than bolted bonnet (approx 0.2 kg less) .
4.2 End Preparation Details (Per ASME Standards)
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Connection Type
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Tiêu chuẩn
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Details
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Socket Weld (SW)
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ASME B16.11
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3/4″ Socket Weld, bore to match pipe schedule (Sch. 160 / XXS)
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Mối hàn đối đầu (BW)
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ASME B16.25
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Bevel: 37.5°, Root face: 1.6 mm
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Threaded (NPT)
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ASME B1.20.1
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3/4″ NPT Female
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4.3 Welded Bonnet Design Details
- Bonnet Attachment: Threaded-in to precise torque, then seal welded
- Weld Type: Full penetration strength weld
- Leakage Protection: Dual protection – threads + strength weld
- Gioăng: None (eliminates gasket leak path)
- Pressure-Temperature Rating (ASME B16.34 / Class 2500)
Material Group: Carbon Steel (ASTM A105)
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Temperature (°C)
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Working Pressure (bar)
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Working Pressure (psi)
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Ghi chú
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-29 to 38
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420
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6090
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Maximum Rating (Class 2500)
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100
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395
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5730
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200
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360
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5220
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300
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320
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4640
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400
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285
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4135
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425
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245
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3550
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Max for A105
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*For Stainless Steel (F304/F316): similar ratings up to 550°C with derating .*
- Test Pressure (API 598)
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Test Type
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Medium
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Pressure (bar)
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Pressure (psi)
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Acceptance Criteria
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Shell Test (Hydrostatic)
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Water
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630
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9135
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1.5 x 38°C Rating (no visible leakage)
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High-Pressure Seat Test
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Water
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462
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6700
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1.1 x 38°C Rating (Rate A/B per API 598)
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Low-Pressure Seat Test
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Air / N2
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5.5 – 7.0
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80 – 100
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Bubble-tight
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Welded Joint Test
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Water/Helium
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Full shell pressure
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—
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100% inspected, no leakage
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- Flow Characteristics (3/4″ – Class 2500)
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Tham số
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Value
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Flow Coefficient Cv (approx)
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~2.5 – 4.0 (typical for 3/4″ globe valve)
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Flow Coefficient Kv (approx)
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~2.2 – 3.5
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Flow Characteristic
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Linear / Equal Percentage (depending on trim)
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Seat Leakage Class
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Class IV (Metal Seat) per ANSI/FCI 70-2
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Loại lỗ khoan
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Full Bore / Reduced Bore (optional)
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- Welded Bonnet Advantages
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Feature
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Benefit
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No Gasket
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Eliminates potential leak path at body-bonnet joint
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Threaded + Welded
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Dual protection against leakage
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Compact Design
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Lighter than bolted bonnet (approx 0.2 kg less)
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High Integrity
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Suitable for high pressure, high temperature, and hazardous services
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Maintenance
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Non-repairable bonnet – but highly reliable
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Zero Fugitive Emissions
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Ideal for critical service applications
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- Features & Applications
- Key Features:
- Welded Bonnet Construction: Threaded-in and strength-welded bonnet eliminates gasket and provides zero leakage at body-bonnet joint .
- High Pressure Capability (2500LB): Designed for extreme high-pressure applications up to 420 bar (6000 PSI) .
- Forged Body Construction: Close die forged steel provides superior strength, uniform grain flow, and absence of porosity .
- Integral Seat: Machined directly into body for maximum strength and reliability .
- API 602 Design: Meets stringent industry standards for forged steel valves .
- Excellent Throttling Control: Globe valve design provides precise flow regulation .
- Backseat Design: Protects stem packing when valve is fully open .
- OS&Y Design: Rising stem provides visual indication of valve position .
- High Temperature Capability: Suitable for temperatures up to 550°C with appropriate materials .
- Compact & Lightweight: Welded bonnet design reduces weight compared to bolted bonnet .
- Multiple End Options: Available in socket weld, butt weld, or threaded connections .
- Fugitive Emission Control: Welded bonnet eliminates potential leak path, ideal for critical service .
- Main Applications:
- High-Pressure Steam Systems: Power plants, boiler systems .
- Refineries & Petrochemical: Hydrocarbon processing, high-pressure fluid control .
- Oil & Gas Production: Wellhead control, high-pressure gathering systems .
- Chemical Processing: Corrosive fluid handling (with SS materials) .
- High-Temperature Applications: Up to 550°C with alloy materials .
- Dịch vụ quan trọng: Where zero leakage and maximum reliability are required .
- Instrument Connections: Small bore high-pressure isolation .
- Comparison: Welded Bonnet vs. Bolted Bonnet (3/4″ Class 2500)
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Tham số
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Welded Bonnet
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Bolted Bonnet
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Weight
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1.9 kg
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2.1 kg
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Leak Path
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None (welded)
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Gasket (potential leak)
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Maintenance
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Non-repairable bonnet
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Repairable/removable
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Fugitive Emissions
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Zero
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Potential (gasket/packing)
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Cost
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Slightly lower
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Slightly higher
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Ứng dụng
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Critical service, high pressure
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General service
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- Ordering Information
Please specify when ordering:
- Valve size: 3/4″ (DN20)
- Pressure class: 2500LB
- Body material: A105 / F304 / F316 / F22
- Bonnet type: Welded Bonnet
- End connections: SW / BW / NPT
- Seat type: Metal (standard)
- Disc/seat hardfacing: Stellite (optional)
- Operation: Handwheel / Gear / Actuator
- Special requirements: NACE, oxygen cleaning, low temperature, etc.
*Disclaimer: The above data is prepared based on common industry standards (API 602, ASME B16.34, API 598) for welded bonnet globe valves . The welded bonnet design provides maximum integrity for high-pressure and critical service applications by eliminating the body-bonnet gasket. Specific dimensions, materials, and pressure ratings may vary by manufacturer. The final technical agreement and certified drawings shall prevail.*
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