The bellows globe valve is a type of bellows-sealed valve, belonging to the category of non-forced sealing valves. Its main structure includes a valve body, valve cover, valve stem, bellows sealing element, and a drive mechanism such as a handwheel or electric motor. The valve stem passes through the valve body and connects to the bellows sealing element; the valve's opening and closing are achieved through the rotational movement of the drive mechanism.
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bellows globe valve Technical parameters
Caliber: DN15~DN300
Working Pressure: PN16~PN40
Body, bonnet: Stainless Steel, Carbon Steel
Connection forms: Flange, Butt Welding
Filler: Graphite, PTFE
Pressure temperature level: −20°C ~ 350°C
| Item | Description |
|---|---|
| Structural formation | BB–BG–OS & Y |
| Driving manner | Hand-operated / Pneumatic |
| Design standard | DIN3356 |
| Face-to-face length | DIN3203 |
| Flange ends | DIN2543–2545 |
| Test & inspection | DIN3230 |
bellows globe valve Performance Specification
| Nominal Pressure (MPa) | Shell Test Pressure (MPa) | Sealing Test Pressure (MPa) | Suitable Temperature (°C) | Suitable Medium |
|---|---|---|---|---|
| 1.6 | 2.4 | 1.76 | −20°C ~ 350°C | Water, steam, oil |
| 2.5 | 3.75 | 2.75 | −20°C ~ 350°C | Water, steam, oil |
| 4.0 | 6.0 | 4.0 | −20°C ~ 350°C | Water, steam, oil |
Drawings for a bellows globe valve customized for a Saudi customer.
bellows globe valve Main Parts Materials
| No. | Part Name | Material | No. | Part Name | Material |
|---|---|---|---|---|---|
| 1 | Body | GS-C25, CF8, CF3 | 9 | Nut | Brass alloy ZQA19-4 |
| 2 | Disc | 2Cr13, F304, F316 | 10 | Handwheel | Carbon steel |
| 3 | Pin | F304, F316 | 11 | Bonnet Cap | 25# carbon steel |
| 4 | Bellows Assembly | F304, F316L | 12 | Oil Cup | Brass |
| 5 | Bonnet (Cover) | GS-C25, CF8, CF3 | 13 | Hex Nut | ASTM A193 2H, A193-8, A193-8M |
| 6 | Packing | Flexible graphite, PTFE | 14 | Double-headed Bolt | ASTM A193 B7, A193-8, A193-B8M |
| 7 | Gland | 25#, F304, F316 | 15 | Gasket | Flexible graphite + stainless steel, or PTFE |
| 8 | Guide Piece | 25#, F304, F316 | 16 | Stem | 2Cr13, F304, F316 |
bellows globe valve Features and Advantages
- Excellent Sealing: The bellows globe valve uses a bellows as the sealing element, providing excellent sealing performance. The bellows fits tightly against the valve seat under compression, effectively preventing fluid leakage.
- Corrosion Resistance: The bellows in bellows globe valves are typically made of corrosion-resistant materials, such as stainless steel. This allows the valve to operate stably for extended periods in corrosive media.
- Long Service Life: Due to the good elasticity and wear resistance of the bellows, bellows globe valves have a relatively long service life.
- Automatic Control: Bellows globe valves can be automatically controlled using electric or pneumatic methods, improving the efficiency and safety of pipeline control.
Bellows globe valve applications:
- Chemical industry: Controlling the flow of corrosive media such as acids, alkalis, and organic solvents, such as in sulfuric acid production units and chlor-alkali plants.
- Oil and gas industry: Media cutoff and regulation in oil refineries, offshore platforms, and long-distance pipelines.
- Power industry: Critical control valves for boiler feedwater, steam systems, and nuclear power plant cooling water pipelines.
- Pharmaceuticals and food industry: Zero-contamination control of sterile media (such as water for injection and milk).
- Environmental engineering: Media isolation in wastewater treatment and exhaust gas emission systems.
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