Descrizione
Y Type Bellows Sealed Globe Valve, DN200, PN25, RF End
IL Y Type Bellows Sealed Globe Valve, DN200 (8 Inch), PN25, RF Flanged End is a high-performance industrial isolation and throttling valve designed for zero stem leakage, low pressure loss, E long service life. Combining a Y-pattern body design with a multi-ply stainless steel bellows seal, this valve provides excellent flow characteristics while completely preventing external leakage from the valve stem.
Compared with conventional globe valves, the Y Pattern Bellows Sealed Globe Valve features a streamlined flow path with a reduced flow angle, resulting in significantly lower pressure drop and improved flow efficiency. This makes it an excellent choice for steam pipelines, thermal oil systems, condensate recovery, petrochemical plants, power stations, and other high-temperature industrial applications.
Manufactured according to DIN 3356, EN 13709, EN 1092-1, EN 12266-1, E ASME B16.34 (available upon request), STV Valves supplies reliable bellows sealed globe valves that comply with international quality standards and project specifications.
What Is a Y Type Bellows Sealed Globe Valve?
UN Y Type Bellows Sealed Globe Valve is an advanced globe valve featuring:
- UN 45° Y-pattern body that reduces flow resistance.
- UN welded stainless steel bellows that eliminates stem leakage.
- UN graphite secondary packing for additional operational safety.
- UN precision-machined disc and seat for accurate throttling and tight shut-off.
The Y-pattern design provides smoother fluid flow than standard globe valves while maintaining excellent regulation capability.
Why Choose a Y Pattern Bellows Sealed Globe Valve?
Many industrial systems require both reliable shut-off and precise flow control. Traditional globe valves often create higher pressure losses, while conventional stem packing may require periodic maintenance.
A Y-pattern bellows sealed design solves both issues.
Key Advantages
- Zero stem leakage
- Excellent fugitive emission control
- Lower pressure drop than standard globe valves
- Smooth fluid flow
- Accurate throttling
- Long bellows fatigue life
- Reduced maintenance
- Extended valve service life
- Improved plant safety
- Environmentally friendly operation
Product Specifications
| Item | Specifica |
|---|---|
| nome del prodotto | Y Type Bellows Sealed Globe Valve |
| Tipo di valvola | Y Pattern Bellows Sealed Globe Valve |
| Nominal Size | DN200 (8 Inch) |
| Valutazione della pressione | PN25 |
| Body Material | Carbon Steel (GS-C25 / WCB Standard) |
| Optional Materials | CF8, CF8M, WC6, WC9, Duplex Stainless Steel, Super Duplex |
| Bellows Material | Multi-layer SS316L Stainless Steel |
| Stem Material | Acciaio inossidabile |
| Disc Material | Stainless Steel with Stellite Facing (Optional) |
| Seat Material | Integral Seat / Stellite Hard Facing |
| Imballaggio | Flexible Graphite Secondary Seal |
| Termina connessione | RF Flanged End |
| Flange Standard | EN 1092-1 PN25 |
| Norma di progettazione | DIN 3356 / EN 13709 |
| Inspection Standard | EN 12266-1 / API 598 |
| Temperature Range | -29°C to 425°C (Material Dependent) |
| Operazione | Handwheel (Gear, Pneumatic & Electric Optional) |
How Does the Bellows Seal Work?
Unlike conventional packed valves, the bellows seal creates a fully welded metallic barrier between the process fluid and the external environment.
During valve operation:
- The stem moves vertically.
- The welded bellows expands and contracts without exposing the process media.
- The process fluid remains completely enclosed.
- Flexible graphite packing serves as a secondary emergency seal.
This dual sealing system greatly improves reliability and minimizes maintenance.
Main Features
Y Pattern Body Design
Compared with standard globe valves, the Y-pattern body offers:
- Reduced pressure loss
- Improved flow coefficient (Cv)
- Lower operating torque
- Better energy efficiency
- Reduced turbulence
These advantages make the valve particularly suitable for steam and thermal fluid systems.
Zero Fugitive Emissions
The stainless steel bellows prevents leakage around the valve stem, helping industrial plants comply with increasingly strict environmental regulations.
Precision Flow Control
The globe valve design provides:
- Accurate throttling
- Stable pressure regulation
- Reliable shut-off
- Smooth operation
Long Bellows Service Life
The multi-layer stainless steel bellows is designed for thousands of operating cycles while maintaining reliable sealing performance.
Secondary Safety Packing
Flexible graphite packing provides an additional sealing barrier, ensuring continued protection even under demanding operating conditions.
Typical Applications
Steam Distribution Systems
Widely used in:
- Main steam pipelines
- Boiler outlets
- Steam headers
- Steam distribution networks
Sistemi ad olio termico
Ideal for:
- Heat transfer oil
- High-temperature circulation systems
- Industrial heating equipment
Petrochemical Plants
Suitable for:
- Hydrocarbon processing
- Refinery utilities
- Solvent systems
- Process pipelines
Chemical Processing
Excellent for:
- Organic chemicals
- Industrial solvents
- Process liquids
- High-temperature chemical service
Power Generation
Common applications include:
- Boiler feed systems
- Turbine auxiliary piping
- Condensate recovery
- Heat recovery systems
Industrial Utility Pipelines
Installed in:
- District heating
- Industrial steam networks
- Hot water systems
- Process utility services
Optional Configurations
STV Valves offers a wide range of customized options:
- Electric Actuator
- Pneumatic Actuator
- Gear Operator
- Position Indicator
- Locking Device
- Stellite Trim
- Progettazione antincendio
- Low Emission Packing
- ISO 15848 Fugitive Emission Design
- NACE MR0175 Compliance
- EN 10204 3.1 / 3.2 Material Certificates
- Third-Party Inspection (SGS, BV, DNV, TÜV)
Inspection & Quality Control
Every valve is inspected before shipment.
Testing includes:
- Hydrostatic Shell Test
- Seat Leakage Test
- Bellows Leak Test
- Air Pressure Test
- Backseat Test
- Dimensional Inspection
- Material Verification (PMI)
- Functional Operation Test
- Final Visual Inspection
Inspection is carried out according to EN 12266-1, API598, and customer project specifications.
Why Choose STV Valves?
STV Valves specializes in manufacturing industrial valves for steam, petrochemical, oil & gas, power generation, marine, chemical processing, mining, and water treatment industries.
Our Product Range
- Bellows Sealed Globe Valves
- Y Pattern Globe Valves
- Gate Valves
- Valvole a sfera
- Controlla le valvole
- Butterfly Valves
- Valvole a saracinesca a coltello
- Y Strainers
- Basket Strainers
Available Materials
- ASTM A216 WCB
- GS-C25
- ASTM A351 CF8 / CF8M
- ASTM A217 WC6 / WC9
- Duplex Stainless Steel
- Super Duplex Stainless Steel
- Titanio
- Hastelloy C276
- Monel
- Inconel
With advanced CNC machining, strict quality control, and extensive export experience, STV Valves provides reliable valve solutions that comply with API, ASME, DIN, EN, and ISO standards.
Visit www.stvvalves.com to request a quotation or technical support.
Frequently Asked Questions (FAQ)
What is the advantage of a Y pattern globe valve?
A Y pattern globe valve reduces pressure loss compared with a conventional globe valve while maintaining excellent throttling performance, making it ideal for high-flow steam and thermal oil systems.
Why choose a bellows sealed valve?
The welded stainless steel bellows prevents stem leakage, reduces maintenance, improves safety, and minimizes fugitive emissions.
Is the DN200 PN25 valve suitable for steam?
Yes. It is specifically designed for medium-pressure steam, condensate, thermal oil, and other high-temperature industrial services.
Can this valve be automated?
Yes. It is available with electric, pneumatic, or gear-operated actuators.
Which standards does this valve comply with?
It can be manufactured according to DIN 3356, EN 13709, EN 1092-1, EN 12266-1, ASME B16.34, and project-specific requirements.
Why This Valve Is the Right Choice
IL Y Type Bellows Sealed Globe Valve, DN200, PN25, RF End combines a low-resistance Y-pattern body with advanced bellows sealing technology to provide excellent flow efficiency, zero stem leakage, precise throttling, and long-term reliability. It is an ideal solution for industrial facilities seeking higher energy efficiency, environmental compliance, and dependable performance in demanding service conditions.
