4500LB Closed Die Forged Globe Valve
Description
Pressure Seal Forged Steel Globe Valve Technical Data Sheet
Product Name: Pressure Seal Forged Steel Globe Valve
Pressure Class: Class 4500LB
Nominal Size: 1/2″ ~ 4″ (DN15 ~ DN100)
Standard Materials: Carbon Steel / Alloy Steel / Stainless Steel
1. Product Overview
This valve utilizes a pressure self-tightening (pressure seal) design, suitable for high-temperature, high-pressure, and high-erosion applications. The unique pressure seal structure ensures that the sealing performance increases as the medium pressure inside the bonnet rises. It is primarily installed in power plant boiler systems (drain, blowdown, desuperheating water) and petrochemical pipelines for isolation or shut-off purposes.
2. Basic Technical Specifications
| Item | Technical Parameter |
|---|---|
| Nominal Size (DN/NPS) | DN15 ~ DN100 (1/2″ ~ 4″) |
| Pressure Class (Class) | 4500LB |
| Rated Pressure (PN) | 76.0 MPa (approx. 11,000 PSI) |
| Applicable Media | Water, Steam, Oil, Non-corrosive media |
| Connection Type | Butt Weld (BW), Socket Weld (SW) |
| Operation Type | Handwheel, Electric Actuator, Pneumatic Actuator |
3. Design Standards & Specifications
| Item | Standard Applied |
|---|---|
| Design & Manufacturing | ASME B16.34, JB/T 3595, ASME E101 |
| Face-to-Face / End-to-End | ASME B16.10, JB/T 3595 |
| Butt Weld Ends | ASME B16.25 |
| Socket Weld Ends | ASME B16.11 |
| Pressure-Temperature Ratings | ASME B16.34, JB/T 3595 |
| Inspection & Testing | API 598, JB/T 9092 |
4. Design Features
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Pressure Seal Design: Features a pressure self-tightening seal (Pressure Seal) structure. Sealing is achieved through a wedge-type seal ring between the bonnet and body. As internal pipeline pressure increases, the expansion force on the seal ring also increases, ensuring absolutely reliable sealing performance under extreme high-pressure conditions.
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Erosion-Resistant Seat: The disc and seat sealing surfaces are typically overlaid with Cobalt-based hardfacing alloy (e.g., Stellite) via plasma transferred arc welding. They are precision ground to offer high wear resistance and scratch resistance, effectively resisting erosion from high-temperature, high-velocity fluids.
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Stem Treatment: The stem surface undergoes anti-corrosion nitriding treatment or hard chrome plating to enhance surface hardness, wear resistance, and corrosion resistance, reducing friction at the packing and preventing external leakage.
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Body Structure: Constructed from one-piece forging, eliminating casting defects and providing a dense grain structure with high mechanical strength. The body bore is often designed with a Y-pattern or streamlined contour to minimize fluid resistance and prevent vortex erosion.
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Packing System: Packed with flexible graphite, reinforced internally with nickel wire or stainless steel wire, providing self-lubrication and excellent sealing without scratching the stem.
5. Main Component Materials
| Component | Carbon Steel (Normal Temp) | Alloy Steel (High Temp) | Stainless Steel (Corrosion Resistant) |
|---|---|---|---|
| Body | A105 | F22 / F91 / 12Cr1MoV | F304 / F316 |
| Bonnet / Yoke | A105 | F22 / 12Cr1MoV | F304 / F316 |
| Disc | A105 + Stellite Overlay | 25Cr2MoV + Stellite Overlay | F316 + Stellite Overlay |
| Seat | A105 + Stellite Overlay | 304 + Stellite Overlay | F316 + Stellite Overlay |
| Stem | 2Cr13 | 25Cr2MoV / 1Cr17Ni2 | F316 |
| Pressure Seal Ring | Flexible Graphite + Stainless Steel Strip / Inconel 718 | ||
| Packing | Flexible Graphite (with Nickel Wire reinforcement) | ||
| Yoke Sleeve/Nut | Aluminum Bronze / Ni-Resist Cast Iron | ||
| Gland / Bonnet Insert | F6a / 420 / 304 |
Note: Specific materials can be selected based on operating conditions and ASTM/ASME standards.
6. Dimensions & Connections (Reference)
The following are typical dimensions for manual operated, butt-weld end valves. Actual dimensions may vary by manufacturer.
| Nominal Size | inch (in) | 1/2″ | 3/4″ | 1″ | 1.5″ | 2″ | 3″ | 4″ |
|---|---|---|---|---|---|---|---|---|
| Nominal Size | DN (mm) | 15 | 20 | 25 | 40 | 50 | 80 | 100 |
| Length (L) | mm (approx) | ~230 | ~270 | ~300 | ~400 | ~450 | ~600 | ~700 |
| Height (H) | mm (approx) | ~250 | ~270 | ~300 | ~450 | ~500 | ~750 | ~900 |
| Handwheel Dia. | mm | 150 | 150 | 200 | 300 | 350 | 450 | 600 |
| Butt Weld OD | mm | Determined by Schedule No. (Commonly Sch160 or XXS) |
7. Pressure Testing (Class 4500LB)
| Test Item | Medium | Pressure (MPa) | Standard |
|---|---|---|---|
| Shell Hydrostatic Test | Water | 75.0 ~ 85.0 (1.5 x Rated Pressure) | API 598 |
| High Pressure Seat Test | Water/Air | 55.0 ~ 62.0 (1.1 x Rated Pressure) | API 598 |
| Backseat Test | – | As per standard | API 598 |
8. Ordering Information / Inquiries
To ensure the correct valve is selected for your application, please provide the following details when ordering:
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Model / Type: e.g., J61Y-4500LB (Manual, Butt Weld), J961Y-4500LB (Electric, Butt Weld).
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Size & Connection: Nominal size and specific welding end preparation details (Schedule No.).
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Service Conditions: Media type, Operating Pressure, Operating Temperature (to determine the correct material grade).
