Below Sealed Globe Valve

Corrosion
Resistant

Leak Tight
Sealing

Automated
Operation

Low Maintenance
Long Life

Bellows Sealed Globe Valve is a linear-motion valve designed for reliable flow isolation and regulation in industrial piping systems where minimizing stem leakage and fugitive emissions is important. Unlike a conventional packed globe valve, the valve uses a metal bellows assembly as the primary stem sealing barrier, separating the process fluid from the external atmosphere. The valve combines the throttling capability of a globe valve with a bellows-based stem sealing arrangement. It is commonly considered for applications involving steam, thermal oil, hazardous chemicals, toxic fluids, hydrocarbons and other process media where conventional packing leakage needs to be minimized.

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Product Specifications and Overview

ALIS Valves offers Below Sealed Globe Valves for industrial applications requiring precise flow regulation, reliable shut-off and effective stem sealing. These valves are designed with a below-seal arrangement that helps isolate the stem from the process fluid, depending on the valve design, reducing the risk of external leakage and supporting safer operation. The globe valve design allows controlled throttling of fluid flow, making it suitable for applications where regulating flow and maintaining process conditions are important.

Below Sealed Globe Valves are used in chemical processing plants, power generation facilities, oil and gas installations, refineries, water treatment plants and other industrial process systems. They can be selected for compatible liquid, gas or steam applications according to the specified valve design and service conditions. Important selection factors include valve size, pressure rating, operating temperature, flow rate, process media, body material, trim material, end connection and sealing requirements. Choosing the appropriate valve configuration helps support dependable performance, efficient flow control and safe operation within the intended industrial system.

Size Range

DN15 to DN400 (1/2" to 16")

Pressure Rating

Class 150 / 300 / 600 / 900 / 1500

Nominal Pressure

PN10 / PN16 / PN25 / PN40

Body Materials

WCB, LCB, CF8, CF8M, CF3, CF3M and others

Bellows Material

SS304 / SS316 / SS316L / SS316Ti

Disc Material

SS / alloy steel / hard-faced trim

Seat Type

Metal Seat / Hard-Faced Seat

End Connection

Flanged / Butt Weld / Socket Weld

Installation

Horizontal / Vertical piping as permitted by design

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Industries Served

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Applications

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Frequently Ask Questions

How do you select the correct valve size for a Bellows Sealed Globe Valve?

Valve size is selected based on flow rate, pressure drop, media properties and required flow capacity (Cv).

Bellows Sealed Globe Valve vs Gate Valve — which is suitable for throttling?

A Globe Valve is generally more suitable for throttling because of its flow-control design.

Can an electric actuator be used with a Bellows Sealed Globe Valve?

Yes. Electric actuators can provide remote or automated operation when correctly sized.

What standards apply to Bellows Sealed Globe Valves?

Commonly referenced standards include ASME B16.34, EN 13709, BS 1873, API 598 and ISO 5208, depending on the valve and project requirements.

What is ASME B16.34 for valves?

ASME B16.34 specifies requirements related to valve design, pressure-temperature ratings, materials, dimensions and testing.

What is BS 1873 and where is it used for Globe Valves?

BS 1873 is a British Standard for steel globe and globe stop/check valves, commonly used in petroleum, petrochemical and related industries.

What is the difference between a Bellows Sealed Globe Valve and a Bellows Sealed Gate Valve?

Globe valves can provide throttling and isolation, while gate valves are primarily designed for full-open or full-closed isolation.

Can a pneumatic actuator be fitted to a Bellows Sealed Globe Valve?

Yes. Pneumatic actuators can be selected based on required thrust, stroke and operating conditions.

How can cavitation be prevented in a Bellows Sealed Globe Valve?

Proper sizing, suitable trim, controlled pressure drop and anti-cavitation designs can help reduce cavitation.

What is ISO 5208 valve leakage testing?

ISO 5208 defines pressure-testing procedures and leakage-rate criteria for metallic industrial valves.

What is API 598 valve testing?

API 598 specifies inspection and pressure-testing requirements for applicable industrial valves, including shell and closure tests.