Descrizione

High-Performance Bellows Seal Globe Valve for Zero Leakage Industrial Applications

IL ANSI Bellows Seal Globe Valve, Class 300LB, ASTM A216 WCB, 3 Inch, RF End is a premium industrial valve designed for zero stem leakage, accurate flow regulation, E long-term operational reliability. Featuring a welded stainless steel bellows seal, this valve eliminates fugitive emissions while providing superior sealing performance compared to conventional packed globe valvole.

Manufactured from ASTM A216 WCB carbon steel and engineered according to BS 1873, ASME B16.34, ASME B16.5, E API598, this valve is widely used in steam systems, thermal oil plants, refineries, petrochemical facilities, power stations, chemical processing plants, LNG terminals, and industrial utility pipelines.

At STV Valves, we manufacture high-quality Bellows Seal Globe Valves for customers worldwide, offering customized materials, pressure classes, trim options, and actuator solutions.

Why Choose a Bellows Seal Globe Valve?

Industrial facilities handling steam, thermal oil, toxic gases, hazardous chemicals, or expensive process fluids cannot tolerate stem leakage. Conventional globe valves rely solely on graphite packing around the valve stem, which gradually wears during repeated operation.

UN Bellows Seal Globe Valve incorporates a precision-welded stainless steel bellows that creates a permanent pressure barrier between the process fluid and the atmosphere. This significantly reduces maintenance, improves environmental protection, and extends valve service life.

Key Benefits

• Near-zero stem leakage
• Excellent fugitive emission control
• Long bellows fatigue life
• Accurate throttling performance
• Reliable shut-off capability
• Lower maintenance costs
• Improved plant safety
• Extended valve service life

Product Specifications

What Is a Bellows Seal Globe Valve?

A Bellows Seal Globe Valve is designed to prevent leakage around the valve stem by replacing the traditional packing-only seal with a welded metal bellows.

During operation:

1. The handwheel rotates the valve stem.
2. The stainless steel bellows expands or contracts together with the stem.
3. The process fluid remains completely isolated inside the valve body.
4. Graphite packing acts as an additional backup seal.
5. The globe valve provides excellent throttling and shut-off performance.

This dual sealing structure makes bellows seal valves the preferred choice for hazardous and environmentally sensitive applications.

Main Features

Zero Fugitive Emissions

The welded bellows completely isolates the process medium from the atmosphere, minimizing environmental pollution and complying with strict emission regulations.

Precision Flow Regulation

Unlike gate valves, globe valves are specifically designed for throttling applications.

Advantages include:

• Stable flow control
• Accurate regulation
• Excellent sealing
• Low vibration
• Smooth operation

High-Strength WCB Body

ASTM A216 WCB carbon steel provides:

• Excellent pressure resistance
• High mechanical strength
• Good weldability
• Outstanding durability
• Cost-effective performance

Multi-Layer Stainless Steel Bellows

The precision-formed SS316L bellows offers:

• High fatigue resistance
• Long operating life
• Excellent corrosion resistance
• Reliable sealing under repeated cycling

Secondary Packing Protection

In addition to the bellows, graphite packing provides an extra sealing layer, ensuring maximum operational safety even under demanding conditions.

Advantages Compared with Standard Globe Valves

Although bellows seal valves have a higher initial cost, they significantly reduce maintenance expenses and environmental risks over the valve’s lifetime.

Typical Applications

Steam Systems

Ideal for:

• Boiler systems
• Steam distribution
• Condensate recovery
• Turbine auxiliary piping

Petrochemical Industry

Suitable for:

• Hydrocarbon processing
• Solvent handling
• Refinery utilities
• Process pipelines

Chemical Processing

Widely used for:

• Corrosive liquids
• Toxic chemicals
• Organic solvents
• Process control systems

Sistemi ad olio termico

Provides reliable shut-off and flow regulation in high-temperature heat transfer applications.

LNG & Industrial Gas

Excellent for controlling natural gas, nitrogen, hydrogen, and other industrial gases where leakage control is essential.

Power Generation

Used in:

• Feedwater systems
• Steam pipelines
• Cooling systems
• Auxiliary process lines

Available Options

STV Valves offers customized configurations including:

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

Quality Assurance & Inspection

Every valve manufactured by STV Valves undergoes comprehensive quality inspection before shipment.

Testing includes:

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

All inspections comply with API598, ASME B16.34, and customer project specifications.

Why Choose STV Valves?

STV Valves is an experienced industrial valve manufacturer serving customers in the oil & gas, petrochemical, power generation, chemical, marine, mining, and water treatment industries.

Our Main Products

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

Available Materials

• ASTM A216 WCB
• ASTM A351 CF8 / CF8M
• ASTM A352LCB
• ASTM A217 WC6 / WC9
• Duplex Stainless Steel
• Super Duplex Stainless Steel
• Titanio
• Hastelloy C276
• Monel
• Inconel

Our products are exported worldwide and manufactured according to API, ASME, DIN, EN, ISO, and customer-specific standards.

For technical support or a customized quotation, visit www.stvvalves.com.

Frequently Asked Questions (FAQ)

What is the purpose of a bellows seal?

A bellows seal prevents leakage around the valve stem by creating a welded metal barrier between the process fluid and the atmosphere, reducing fugitive emissions and improving safety.

Why choose a WCB bellows seal globe valve?

ASTM A216 WCB offers excellent strength, durability, and cost-effective performance for steam, oil, gas, and general industrial services.

Can this valve be used for throttling?

Yes. Globe valves are specifically designed for precise flow regulation and shut-off, making them ideal for control applications.

What industries commonly use bellows seal globe valves?

Power generation, petrochemical, chemical processing, refineries, pharmaceutical plants, LNG terminals, district heating, and industrial steam systems.

Which international standards does the valve meet?

This valve can be manufactured to BS 1873, ASME B16.34, ASME B16.5, ASME B16.10, API598, ISO 15848, and customer project requirements.

Why This Product Is Ideal for Industrial Projects

IL ANSI Bellows Seal Globe Valve, Class 300LB, WCB, 3 Inch, RF End combines robust carbon steel construction with advanced bellows sealing technology to deliver zero stem leakage, precise flow control, and exceptional operational reliability. It is an ideal solution for industries that prioritize environmental protection, process safety, and long service life.

Whether installed in a power plant, refinery, chemical facility, or steam distribution network, this valve provides dependable performance while reducing maintenance costs and helping facilities comply with increasingly strict environmental regulations.