Descrizione

DIN Bellows Sealed Globe Valve,PN64,DN125,RF End

IL DIN Bellows Sealed Globe Valve, PN64, DN125 (5 Inch), RF Flanged End is a premium industrial isolation and throttling valve designed for zero stem leakage, excellent flow control, E long service life. Featuring a multi-ply stainless steel bellows seal and a DIN-compliant flanged design, this valve is widely used in high-pressure steam systems, thermal oil pipelines, petrochemical plants, refineries, power stations, chemical processing facilities, and district heating networks.

Unlike conventional globe valves, the DIN Bellows Sealed Globe Valve utilizes a hermetically welded metal bellows that completely isolates the process fluid from the atmosphere. This advanced sealing technology virtually eliminates fugitive emissions, reduces maintenance requirements, and significantly improves plant safety.

Manufactured according to DIN 3356, EN 13709, EN 1092-1, EN 12266-1, ISO 15848, E ASME B16.34 (optional), STV Valves provides reliable bellows sealed globe valves for demanding industrial applications worldwide.

What Is a DIN Bellows Sealed Globe Valve?

UN DIN Bellows Sealed Globe Valve is a linear-motion valve designed for both flow regulation E tight shut-off while preventing leakage around the valve stem.

Instead of relying solely on conventional stem packing, the valve incorporates a precision-welded stainless steel bellows assembly between the stem and bonnet.

This design provides:

• Zero external stem leakage
• Lower fugitive emissions
• Longer maintenance intervals
• Improved operational safety
• Reliable sealing throughout the valve’s service life

Why Choose a Bellows Sealed Globe Valve?

Industrial plants handling high-temperature steam, hot oil, hazardous chemicals, or valuable process fluids require dependable sealing performance.

The bellows seal technology offers significant advantages over conventional packed valves.

Key Benefits

• Virtually zero stem leakage
• Excellent environmental protection
• Reliable shut-off performance
• Accurate throttling capability
• Long bellows fatigue life
• Reduced maintenance costs
• Lower lifecycle cost
• High operational safety
• Suitable for continuous industrial service

Product Specifications

Working Principle

The valve combines a traditional globe valve mechanism with a welded soffietto assembly.

During operation:

1. The handwheel rotates the valve stem.
2. The stainless steel bellows expands and contracts together with the stem.
3. The process media remain completely enclosed inside the valve body.
4. Flexible graphite packing serves as a secondary emergency seal.
5. The valve provides accurate flow regulation and dependable shut-off.

This dual sealing system greatly improves reliability and environmental performance.

Main Features

Zero Fugitive Emissions

The welded bellows completely isolates the process fluid from the surrounding atmosphere, making the valve suitable for environmentally sensitive applications.

Excellent Flow Regulation

The globe valve design provides:

• Stable pressure control
• Accurate throttling
• Smooth operation
• Reliable shut-off
• Long service life

DIN Standard Flanged Connection

The RF flanged design offers:

• Easy installation
• Secure gasket sealing
• Convenient maintenance
• Compatibility with EN 1092-1 piping systems

Stainless Steel Multi-Layer Bellows

The precision-formed bellows provides:

• Excellent fatigue resistance
• Long operating life
• Corrosion resistance
• Maintenance-free sealing performance

Secondary Graphite Packing

Flexible graphite packing acts as an additional safety seal, ensuring reliable operation even after extended service.

Typical Applications

Steam Systems

Ideal for:

• Main steam pipelines
• Boiler systems
• Steam distribution
• Condensate recovery

Sistemi ad olio termico

Suitable for:

• Heat transfer oil
• Industrial heating equipment
• High-temperature process piping

Petrochemical Industry

Used in:

• Refinery process systems
• Hydrocarbon pipelines
• Utility services
• Process control applications

Chemical Processing

Excellent for:

• Corrosive process media
• Organic chemicals
• Industrial solvents
• High-temperature fluids

Power Generation

Installed in:

• Boiler feed systems
• Turbine auxiliary pipelines
• Condensate systems
• District heating plants

Industrial Utility Networks

Commonly used for:

• Hot water systems
• Industrial steam distribution
• Utility piping
• Process services

Optional Configurations

STV Valves offers a complete range of customization options:

• Electric Actuator
• Pneumatic Actuator
• Gear Operator
• Position Indicator
• Locking Device
• Stellite Trim
• Progettazione antincendio
• ISO 15848 Low Emission Design
• Cryogenic Extension Bonnet
• NACE MR0175 Compliance
• EN 10204 3.1 / 3.2 Material Certification
• Third-Party Inspection (SGS, BV, DNV, TÜV)

Inspection & Quality Assurance

Every DIN Bellows Sealed Globe Valve undergoes comprehensive inspection before shipment.

Testing includes:

• Hydrostatic Shell Test
• Seat Leakage Test
• Bellows Leak Test
• Air Leakage Test
• Backseat Test
• Positive Material Identification (PMI)
• Dimensional Inspection
• Functional Operation Test
• Final Visual Inspection

Testing is carried out according to EN 12266-1, API598, and customer project specifications.

Why Choose STV Valves?

STV Valves is a trusted manufacturer of industrial valves serving customers in power generation, petrochemical, oil & gas, marine, chemical processing, mining, district heating, and water treatment industries.

Our Product Range

• DIN Bellows Sealed Globe Valves
• Bellows Seal Globe Valves
• Gate Valves
• Valvole a sfera
• Controlla le valvole
• Butterfly Valves
• Valvole a saracinesca a coltello
• Y Strainers
• Basket Strainers

Available Materials

• GS-C25
• ASTM A216 WCB
• ASTM A351 CF8 / CF8M
• ASTM A217 WC6 / WC9
• Duplex Stainless Steel
• Super Duplex Stainless Steel
• Titanio
• Hastelloy C276
• Monel
• Inconel

With advanced CNC machining centers, strict quality management, and extensive export experience, STV Valves manufactures industrial valves that comply with DIN, EN, API, ASME, ISO, and customer-specific standards.

Visit www.stvvalves.com to request a quotation, technical documentation, or customized engineering support.

Frequently Asked Questions (FAQ)

What is the main advantage of a bellows sealed globe valve?

The welded stainless steel bellows prevents stem leakage, significantly reducing fugitive emissions while extending valve service life and lowering maintenance costs.

Why choose a PN64 globe valve?

A PN64 pressure rating is suitable for medium- to high-pressure industrial systems, including steam, thermal oil, and chemical process pipelines.

Is the DN125 valve suitable for steam service?

Yes. The DN125 PN64 bellows sealed globe valve is commonly used in high-pressure steam distribution, boiler systems, and condensate recovery applications.

Can this valve be automated?

Yes. It is available with electric, pneumatic, or gear-operated actuators to support automated process control.

Which standards does this valve comply with?

The valve can be manufactured according to DIN 3356, EN 13709, EN 1092-1, EN 12266-1, ISO 15848, and customer-specific project requirements.

Why This DIN Bellows Sealed Globe Valve Is the Best Choice

IL DIN Bellows Sealed Globe Valve, PN64, DN125, RF End combines proven bellows sealing technology with a robust DIN-standard design to deliver zero stem leakage, precise flow regulation, exceptional reliability, and extended service life. It is an ideal solution for industrial facilities that require safe operation, environmental compliance, and dependable performance in steam, thermal oil, and demanding process applications.