Bellows Seal Globe Valve-DN100 PN25 RF
Description
TECHNICAL DATA SHEET
BELLOWS SEAL GLOBE VALVE – WCB BODY
DN100 PN25 · RAISED FACE FLANGED ENDS
1. GENERAL DESCRIPTION
Heavy-duty globe valve featuring a metallic bellows seal as the primary stem sealing element, backed by a conventional stuffing box (secondary packing). The rising stem (outside screw and yoke – OS&Y) design provides visual position indication. This construction guarantees zero emissions to atmosphere and is ideal for steam, thermal oil, and other industrial fluids where fugitive emission control is critical. The valve body, bonnet, and main pressure-boundary parts are manufactured from ASTM A216 WCB (1.0619) carbon steel.
2. DESIGN STANDARDS
| Parameter | Standard / Specification |
|---|---|
| Valve design & manufacture | EN 13709 / ASME B16.34 |
| Bellows design | EN 1491 / AD 2000 Merkblatt A11 |
| Face-to-face dimension | EN 558-1, Series 1 (350 mm) |
| Flange connection | EN 1092-1 Type B1, PN25 RF |
| Pressure testing & inspection | EN 12266-1 Category A |
| Marking | EN 19 |
3. MATERIALS OF CONSTRUCTION
| Component | Material |
|---|---|
| Body | ASTM A216 WCB (1.0619) / Carbon steel |
| Bonnet | ASTM A216 WCB / Carbon steel |
| Disc | AISI 420 (13Cr) stainless steel, seating face Stellite® overlaid |
| Seat ring | AISI 420 (13Cr) + Stellite® faced, threaded-in & renewable |
| Stem | ASTM A276 SS410 / SS304 |
| Stem nut (yoke bush) | ASTM B148 C95800 (Ni-Al bronze) |
| Bellows | Multi-ply AISI 316L (1.4404) or AISI 321 |
| Secondary packing set | Pure graphite / PTFE braided |
| Body-bonnet gasket | Spiral wound SS304 + Graphite |
| Bonnet gasket | Stainless steel reinforced graphite (fire-safe) |
| Bolting | ASTM A193 B7 / A194 2H (carbon steel, heavy hex) |
| Handwheel | Ductile iron, epoxy coated |
4. PRESSURE – TEMPERATURE RATINGS
Based on EN 1092-1, material group 1EO (WCB / 1.0619), PN25
| Temperature (°C) | Max. working pressure (bar) |
|---|---|
| -10 to 50 | 25.0 |
| 100 | 24.2 |
| 150 | 22.6 |
| 200 | 21.1 |
| 250 | 19.4 |
| 300 | 17.5 |
| 350 | 15.8 |
Intermediate values should be determined in accordance with EN 1092-1. Bellows life is influenced by the combined effect of pressure, temperature, stroke and cycle frequency.
5. TESTING & INSPECTION
| Test type | Test medium | Test pressure | Acceptance criteria |
|---|---|---|---|
| Shell (body) test | Water | 37.5 bar (1.5×PN) | No visible leakage or deformation |
| Seat test | Water | 27.5 bar (1.1×PN) | Rate A – zero leakage per EN 12266-1 |
| Bellows tightness test | Air / Helium | 6 bar (pneumatic) | Max. leak rate: < 1×10⁻³ mbar·l/s (helium) |
| Secondary packing test | Water | Static pressure | No visible leakage during shell test |
Standard NDE includes visual, dimensional checks, and pressure tests. PMI, dye penetrant, and helium leak detection are performed as standard on bellows components.
6. DIMENSIONS & APPROXIMATE WEIGHTS
| Symbol | Description | Value |
|---|---|---|
| DN | Nominal size | 100 mm |
| PN | Pressure class | 25 bar |
| L | Face-to-face (EN 558-1 Ser.1) | 350 mm |
| H | Centre line to handwheel top | ~660 mm |
| H1 | Centre line to bonnet top | ~420 mm |
| ØW | Handwheel diameter | ~355 mm |
| D | Flange outer diameter | 235 mm |
| K | Bolt circle diameter | 190 mm |
| n × d | Bolt holes | 8 × Ø22 mm |
| Weight | (approximate) | 95 kg |
Flange facing: Raised Face (RF), EN 1092-1 Form B1.
7. OPERATION
-
Standard: Rising stem (OS&Y) handwheel – multi-turn, with position indicator.
-
Optional: ISO 5210 mounting pad for electric actuator, bevel gear operator, chain wheel, or locking device.
8. FEATURES & BENEFITS
-
Metallic bellows seal – 100% emission-free primary seal; no fugitive emissions.
-
Back-up stuffing box – ensures continued plant operation in the rare event of bellows failure.
-
WCB carbon steel body – cost-effective for non-corrosive applications; suitable for saturated steam, superheated water, thermal oil, and hydrocarbon services up to 350°C.
-
Fire-safe design option – API 607 / ISO 10497 available with graphite secondary packing and metal gaskets.
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Blow-out proof stem – anti-ejection shoulder for operational safety.
-
Stellite® hardfaced seating surfaces – excellent resistance to wear, galling and erosion, ensuring long service life.
-
Renewable seat ring – simplifies maintenance and reduces life-cycle costs.
9. OPTIONS & VARIATIONS
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Body/bonnet in CF8 (SS304), CF8M (SS316), CF3M (SS316L) or special alloys
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Extended bonnet for high/low temperature insulation
-
NACE MR0175 / ISO 15156 for sour service
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Electric or pneumatic actuator with integrated smart positioner
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Limit switches, 4–20 mA position transmitters
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Full material certification to EN 10204 3.1 / 3.2
10. ORDERING INFORMATION
Bellows Seal Globe Valve, OS&Y, WCB Carbon Steel Body, DN100, PN25, Raised Face Flanged Ends, Handwheel Operated, Stellited Seat, Multi-ply Bellows, EN 1092-1 Flanges.
This technical data sheet supersedes previous editions specifying CF8/CF8M body. Certified general arrangement drawings, bellows life-cycle calculations and material certificates are available on request.
