Close Die-Forged Bellow Seal Globe Valve
Description
Technical Data Sheet
Forged Steel Bellows Seal Globe Valve
Product: Forged Steel Bellows Seal Globe Valve
Valve Type: Straight Pattern Globe Valve with Bellows Seal
Model: WJ41H / WJ61H Series (Flanged / Socket Weld)
Body Material: Forged Steel (ASTM A105 / A182 F304 / F316)
Standard: API 602 / BS 5352 / MSS-SP-117
1. Product Description
A Forged Steel Bellows Seal Globe Valve is a specialized isolation valve designed for zero leakage of hazardous or valuable media. Unlike conventional globe valves that rely solely on gland packing, this valve incorporates a metal bellows as the primary stem seal. The bellows is welded to the stem and bonnet, creating a hermetic barrier between the process fluid and the atmosphere .
This design eliminates fugitive emissions and is ideal for high-temperature, high-pressure applications in power plants, chemical processing, and steam systems . A secondary graphite packing provides backup sealing in case of bellows failure, ensuring double safety .
2. Design & Inspection Standards
| Item | Standard / Code | Remarks |
|---|---|---|
| Design & Manufacturing | API 602 / BS 5352 / MSS-SP-117 | For forged steel valves – compact design |
| Face-to-Face Dimension | ASME B16.10 | |
| Flange Dimensions | ASME B16.5 (Class 150-1500) | RF (Raised Face) or RTJ |
| Socket Weld Ends | ASME B16.11 | For WJ61H series |
| Threaded Ends | ANSI/ASME B1.20.1 (NPT) | Optional |
| Butt Weld Ends | ASME B16.25 | Optional |
| Inspection & Testing | API 598 / BS EN 12266-1 | Shell and seat tests |
3. Technical Parameters
| Item | Technical Parameter | Remarks |
|---|---|---|
| Valve Type | Straight Pattern Bellows Seal Globe Valve | Bolted Bonnet (BB) or Welded Bonnet (WB) |
| Size Range | DN15 (1/2″) ~ DN50 (2″) (Standard forged range) | Larger sizes up to DN400 available in cast versions |
| Pressure Class | Class 150 LB to Class 1500 LB / PN16to PN160 | Most common: Class 800 LB (API 602 standard) |
| Connection Type | Flanged (ASME B16.5) / Socket Weld (ASME B16.11) / Threaded (NPT) | |
| Operation | Handwheel (Rising Stem) | OS&Y (Outside Screw and Yoke) design |
| Bonnet Type | Bolted Bonnet (BB) or Welded Bonnet (WB) | Welded bonnet for higher pressure integrity |
| Stem Design | OS&Y (Outside Screw & Yoke) with Rising Stem | Stem rises when opening, lowers when closing |
| Temperature Range | -29°C ~ +425°C (Carbon Steel) / -59°C ~ +540°C (Stainless Steel) | Depending on body material |
| Applicable Media | Steam, Water, Oil, Gas, Thermal Oil, Toxic or Hazardous Fluids | Ideal for fugitive emission control |
| Flow Direction | Under the Seat (Standard) | Flow enters below the disc for positive shut-off |
| Shell Test Pressure | 1.5 x Rated Pressure | Per API 598 |
| High-Pressure Seat Test | 1.1 x Rated Pressure | Per API 598 |
| Bellows Test Pressure | 1.1 x Rated Pressure | Independent bellows integrity test |
| Leakage Rate | Zero leakage (Rate A) | Bellows ensures zero fugitive emissions |
4. Key Design Features
Dual Sealing Mechanism:
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Primary Seal: Stainless steel bellows (SS304/SS316L) welded to stem and bonnet, creating a hermetic barrier
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Secondary Seal: Graphite gland packing provides backup sealing if bellows fails
Zero Leakage Performance:
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Eliminates fugitive emissions of hazardous or valuable media
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Meets international environmental standards for emission control
Extended Service Life:
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Bellows withstands millions of cycles without fatigue
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Eliminates stem seal maintenance associated with conventional packing
Forged Construction:
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Superior strength and integrity compared to cast valves
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Suitable for high-pressure applications
Hardfaced Seating Surfaces:
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Disc and seat faces overlaid with Stellite (Co-Cr alloy) for wear resistance
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Ensures tight shut-off even after extended service
Backseat Design:
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Provides additional seal when valve fully open
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Allows packing replacement under pressure (for bolted bonnet designs)
Self-Draining Design:
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Available with 45-degree angle pattern for complete drainage
Live-Loaded Packing (Optional):
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Belleville washers maintain constant packing pressure
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Compensates for thermal cycling and packing wear
5. Material Specifications (Typical Configurations)
*Reference per API 602 and MSS-SP-117 *
| Part Name | Carbon Steel Grade | Stainless Steel Grade (304) | Stainless Steel Grade (316) |
|---|---|---|---|
| Body | ASTM A105 | ASTM A182 F304 | ASTM A182 F316 |
| Bonnet | ASTM A105 | ASTM A182 F304 | ASTM A182 F316 |
| Disc / Valve Plug | A105 + STL (Stellite) | F304 + STL | F316 + STL |
| Stem | A182 F6a (13% Cr) / 420 SS | A182 F304 | A182 F316 |
| Bellows | SS321 / SS316L | SS321 / SS316L | SS316L |
| Seat Ring | A105 + STL (Integral) | F304 + STL (Integral) | F316 + STL (Integral) |
| Gasket (Body-Bonnet) | 304 + Flexible Graphite | 304 + Flexible Graphite | 316 + Flexible Graphite |
| Bolting (Studs) | A193 B7 | A193 B8 | A193 B8M |
| Nuts | A194 2H | A194 8 | A194 8M |
| Packing | Flexible Graphite | Flexible Graphite | Flexible Graphite |
| Gland / Packing Follower | A105 / 420 SS | F304 | F316 |
| Yoke / Handwheel | Carbon Steel / Ductile Iron | Stainless Steel | Stainless Steel |
6. Dimensional Data (Class 800 / PN140 – API 602)
*Reference dimensions based on API 602 and MSS-SP-117 for forged steel valves . Dimensions may vary by manufacturer.*
Socket Weld / Threaded Ends (NPT)
| Size (NPS) | Size (DN) | L (Length) mm | d (Bore – Full Port) mm | d (Bore – Reduced Port) mm | H (Open) mm | W (Handwheel) mm | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 79 | 15 | 9.5 | 209 | 100 | 2.6 |
| 3/4″ | 20 | 92 | 20 | 12.5 | 209 | 100 | 2.7 |
| 1″ | 25 | 111 | 25 | 16.0 | 232 | 125 | 5.0 |
| 1-1/4″ | 32 | 120 | 32 | 22.5 | 266 | 160 | 7.6 |
| 1-1/2″ | 40 | 152 | 38 | 28.5 | 300 | 160 | 9.4 |
| 2″ | 50 | 172 | 51 | 38.0 | 321 | 180 | 11.8 |
Flanged Ends (Class 150 – ASME B16.5)
| Size (NPS) | Size (DN) | L (Face-to-Face) mm | D (Flange O.D.) mm | Bolt Circle (C) mm | No. of Holes | Hole Dia (mm) | H (Open) mm |
|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 108 | 89 | 60.5 | 4 | 16 | 195 |
| 3/4″ | 20 | 117 | 98 | 69.9 | 4 | 16 | 197 |
| 1″ | 25 | 127 | 108 | 79.2 | 4 | 16 | 207 |
| 1-1/2″ | 40 | 165 | 127 | 98.6 | 4 | 16 | 230 |
| 2″ | 50 | 178 | 152 | 120.7 | 4 | 19 | 233 |
Flanged Ends (Class 300 – ASME B16.5)
| Size (NPS) | Size (DN) | L (Face-to-Face) mm | D (Flange O.D.) mm | Bolt Circle (C) mm | No. of Holes | Hole Dia (mm) | H (Open) mm |
|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 140 | 95 | 66.5 | 4 | 16 | 195 |
| 3/4″ | 20 | 152 | 117 | 82.6 | 4 | 19 | 197 |
| 1″ | 25 | 165 | 124 | 89.0 | 4 | 19 | 207 |
| 1-1/2″ | 40 | 190 | 156 | 114.3 | 4 | 22.5 | 230 |
| 2″ | 50 | 216 | 165 | 127.0 | 8 | 19 | 233 |
Flanged Ends (PN16 / PN25 / PN40 – EN 1092)
Reference dimensions
| Size (DN) | L (PN16) mm | L (PN25) mm | L (PN40) mm | D (Flange) mm | Bolt Circle (C) mm | No. of Holes | H (Open) mm |
|---|---|---|---|---|---|---|---|
| 15 | 130 | 130 | 130 | 95 | 65 | 4 | 197 |
| 20 | 150 | 150 | 150 | 105 | 75 | 4 | 197 |
| 25 | 160 | 160 | 160 | 115 | 85 | 4 | 205 |
| 32 | 180 | 180 | 180 | 140 | 100 | 4 | 208 |
| 40 | 200 | 200 | 200 | 150 | 110 | 4 | 230 |
| 50 | 230 | 230 | 230 | 165 | 125 | 4 | 233 |
7. Applications
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Power Plants: Boiler feedwater, steam systems, turbine drains, and high-pressure isolation
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Chemical Processing: Toxic, hazardous, or aggressive chemicals requiring zero leakage
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Petrochemical Refineries: Hydrocarbon services with strict emission control requirements
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Pharmaceutical Industry: Sterile applications where contamination prevention is critical
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Marine & Offshore: Steam systems and hazardous fluid handling
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Thermal Oil Systems: High-temperature heat transfer fluids
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LNG & Cryogenic Services: Special low-temperature designs available down to -196°C
8. Industry Terminology
| Term | Definition |
|---|---|
| Bellows Seal | A flexible metal bellows welded to the stem and bonnet, creating a hermetic barrier that prevents fugitive emissions . |
| Double Seal Design | Redundant sealing system using a primary metal bellows and secondary graphite packing for backup safety . |
| OS&Y (Outside Screw & Yoke) | Stem threads are positioned outside the valve body, preventing corrosion from process media . |
| BB (Bolted Bonnet) | Bonnet secured with studs and nuts, allowing maintenance access . |
| WB (Welded Bonnet) | Bonnet welded to body for higher pressure integrity, non-repairable design . |
| Stellite Hardfacing | Cobalt-chromium alloy overlay on sealing surfaces for wear resistance and extended service life . |
| Live-Loaded Packing | Belleville springs maintain constant compression on packing, compensating for thermal cycling . |
Important Notes:
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Bellows Life Expectancy: Typically rated for 10,000+ cycles under normal operating conditions .
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Temperature Limits:
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Standard Carbon Steel: -29°C to +425°C
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Stainless Steel (304/316): -59°C to +540°C
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Special Alloys: Up to 600°C available
-
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Pressure Class: Forged steel valves are commonly rated to Class 800 per API 602, with higher classes available .
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Bellows Material: Typically SS321 or SS316L for corrosion resistance .
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Optional Features available:
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Pneumatic or electric actuator for automation
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Position indicators and limit switches
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Locking device for handwheel
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Extended bonnet for cryogenic service
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NACE MR0175 compliance for sour service
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Third-party inspection and certification (TÜV, DNV, Lloyd’s)
-
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Certified dimensional drawings should be requested for final installation planning.
