3/4″-2500LB-RTJ*SW Welded Bonnet Globe Valve
Description
Technical Data Sheet
Product: Welded Bonnet Globe Valve
Model / Size: 3/4″ – 2500LB – RTJ × SW (Mixed Ends)
1. Product Description
This valve features a fully welded body-to-bonnet connection, eliminating external leakage paths associated with traditional bolted bonnet designs. It is designed for high-temperature, ultra-high-pressure, toxic, flammable, and explosive services.
The valve is supplied with mixed end connections: one end is RTJ flange, the other end is socket weld, allowing installation between a flanged component and a pipe requiring socket weld termination. The disc and seat are hardfaced with Stellite for wear resistance and reliable shut-off.
2. Basic Parameters
| Item | Parameter |
|---|---|
| Nominal Size | 3/4 inch (DN 20) |
| Pressure Class | Class 2500LB (equivalent to PN 420 bar) |
| End Connections | RTJ (Ring-Type Joint) on one end, SW (Socket Weld) on the other end |
| Body-Bonnet Connection | Welded bonnet |
| Structure Type | Outside Screw & Yoke (OS&Y), Globe pattern |
3. Design Standards
| Item | Standard |
|---|---|
| Design & Manufacture | API 602 (Compact steel gate, globe, and check valves) or ASME B16.34 |
| Pressure-Temperature Rating | ASME B16.34 |
| Flange Dimensions (RTJ) | ASME B16.5 |
| Socket Weld Dimensions | ASME B16.11 |
| Face-to-Face Dimensions | ASME B16.10 (applicable end-to-end length) |
| Inspection & Testing | API 598 (or ISO 5208) |
| Non-Destructive Examination | 100% RT or UT of body-bonnet weld per ASME code |
4. Bill of Materials (Typical Configuration)
| Part Name | Material (Typical Options) | Remarks |
|---|---|---|
| Body | A105 / A182 F316 / F22 (Cr-Mo) | Selected based on service conditions |
| Disc | A105 + hardfacing / F316 + hardfacing | Stellite 6 or 21 hardfacing |
| Seat | Integral body seat with hardfacing | Stellite 6 overlay |
| Stem | A182 F6a (13Cr) / F316 / F304 | Precipitation hardened or austenitic SS |
| Bonnet | Same material as body | Welded connection |
| Packing | Flexible graphite with anti-extrusion rings | Low-emission packing system |
| Handwheel / Stem Nut | Carbon steel / Copper alloy |
5. Dimensions & Weight (Reference)
| Item | Value |
|---|---|
| Face-to-Face (L) | Approx. 140 mm (end-to-end, based on ASME B16.10 short pattern for 2500LB) |
| RTJ Flange End | 1/2″ RTJ flange per ASME B16.5 (ring groove dimensions for 3/4″ valve) |
| SW End | Socket weld per ASME B16.11, socket depth approx. 10 mm |
| Handwheel Diameter (W) | Approx. 150 mm |
| Overall Height (H) | Approx. 280 mm |
| Approx. Weight | 14 ~ 18 kg (depending on material) |
Note: Dimensions and weights are typical values and may vary by manufacturer.
6. Operating Conditions
| Item | Parameter |
|---|---|
| Suitable Media | High-pressure steam, thermal oil, hydrogen, hydrocarbons, corrosive fluids |
| Temperature Range (Carbon Steel) | -29°C ~ 425°C |
| Temperature Range (Alloy Steel) | -29°C ~ 538°C (e.g., F22) |
| Temperature Range (Stainless Steel) | -196°C ~ 538°C |
| Max. Allowable Pressure | Approx. 42.0 MPa (420 bar) at ambient temperature (38°C) |
7. Testing & Inspection
-
Shell Strength Test: 1.5 times rated pressure (hydrostatic); hold time per API 598.
-
High-Pressure Seat Test: 1.1 times rated pressure; no visible leakage.
-
Low-Pressure Pneumatic Test: 0.6 MPa compressed air; seat and packing leakage within allowable limits.
-
Body-Bonnet Weld Examination: 100% radiographic testing (RT) or ultrasonic testing (UT) per ASME Section VIII or equivalent.
-
Operational Test: Full stroke cycling under rated differential pressure to verify smooth operation.
8. Features & Benefits
-
Zero External Leakage: Full-penetration welded bonnet eliminates flange gasket leakage paths.
-
Ultra-High Pressure Capability: Class 2500 rating provides safety and reliability for extreme pressure systems.
-
Mixed End Configuration: RTJ flange on one end for high-pressure flange connections; socket weld on the other end for direct pipe welding, simplifying piping layouts.
-
Wear & Erosion Resistance: Disc and seat hardfaced with cobalt-based Stellite alloy for extended service life.
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Fugitive Emission Compliance: Packing system can meet ISO 15848 or TA-Luft low-emission requirements.
9. Important Notes
-
Flow direction: Refer to the arrow marked on the body. If no arrow is present, confirm directionality with the manufacturer before installation.
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RTJ flange: Requires the appropriate solid metal ring gasket (e.g., R18 for 1/2″ flange) and must be torqued to the specified value.
-
Socket weld end: Follow the approved Welding Procedure Specification (WPS) to avoid excessive weld stress that may affect valve performance.
-
Installation orientation: Typically installed vertically with handwheel upward unless otherwise specified.
If you need additional details (e.g., NACE MR0175, specific test requirements, or material certifications), please let me know and I can expand the data sheet accordingly.
