Bellow Seal Globe Valve

Technical Data:

• Nominal Size: ½” to 24″
• Pressure Class: Class 150 to Class 2500
• Temperature Range: -196°C to +550°C
• Design Standards: API 602, API 623, ASME B16.34, DIN 3356
• Face to Face: ASME B16.10
• End Connections: Flanged / Butt Weld / Socket Weld / Threaded
• Inspection and Testing: API 598, Hydrostatic Test, Seat Leak Test, Bellows Integrity Test

Construction Materials and Valve Components:

Valve Body and Pressure Retaining Components:

• ASTM A216 WCB
• ASTM A352 LCB / LCC
• ASTM A105
• ASTM A351 CF8 / CF8M
• ASTM A182 F304
• ASTM A182 F316
• ASTM A182 F316L
• ASTM A890 F51 / F53 / F55

Internal Valve Components:

• Disc: ASTM A182 F316 / F316L / F11 / F22
• Stem: ASTM A182 F316 / F316L
• Seat Ring: Stainless Steel with Stellite Overlay
• Bellows: Multi-ply Stainless Steel SS316Ti / SS321 (Inconel 625 on request)

Stem Sealing System:

• Primary Seal: Welded Metallic Bellows
• Secondary Packing: Flexible Graphite
• Gasket: Spiral Wound Stainless Steel with Graphite Filler
• Backseat: Integral Backseat Design to Minimize Stem Leakage

Operating Principle of  Bellow Seal Globe Valves:

The Bellow Seal Globe Valve is designed to regulate the flow and ensure effective shut-off where minimum external leakage should be achieved. The bellows made of steel provide complete isolation between the media in the pipeline and the environment.

The design of the bellow seal globe valve allows accurate throttling but also ensures tight shut-off. There is a backup sealing arrangement in the form of the graphite packing which guarantees effective functioning at high temperatures and pressures. The valve can be used with steam, hydrogen, chemicals, hot oil, and other process media.

Material Grades and Available Options of Bellow Seal Globe Valves:

Standard Materials:

Component	Material	Grade	Typical Application
Body	Carbon Steel	ASTM A216 WCB	Steam and utility service
Body	Forged Carbon Steel	ASTM A105	High pressure steam applications
Body	Stainless Steel	ASTM A351 CF8M	Corrosive chemical processing
Body	Forged Stainless Steel	ASTM A182 F316 / F316L	High temperature corrosive service
Disc	Stainless Steel	ASTM A182 F316 / F316L	Flow regulation and sealing
Stem	Stainless Steel	ASTM A182 F316 / F316L	Corrosion resistance and long service life
Seat Ring	Stainless Steel with Stellite Overlay	Hard Faced	Wear resistance and tight shut-off

Additional Material Options (On Request):

• Duplex Stainless Steel ASTM A890 F51 for offshore applications
• Super Duplex ASTM A890 F53 / F55 for chloride service
• Alloy Steel ASTM A182 F11 / F22 for high temperature steam service
• Hastelloy C276 for aggressive chemical applications
• Inconel 625 for hydrogen and elevated temperature service
• Alloy 20 for acid handling systems

Additional Performance Information:

Parameter	Details
Valve Type	Forged Steel Bellow Seal Globe Valve
Operation	Manual / Electric / Pneumatic / Gear Operated
Design Feature	Welded Metallic Bellows with Secondary Graphite Packing
Flow Characteristics	Precise Throttling and Tight Shut-off
Leakage Control	Stem Leakage Prevention and Fugitive Emission Control
Temperature Capability	Suitable from -196°C to +550°C
Service Media	Steam, Hydrogen, Thermal Oil, Chemicals, Gas, Condensate

Available End Connection Options:

• Flanged as per ASME B16.5
• Butt Weld as per ASME B16.25
• Socket Weld as per ASME B16.11
• Threaded Ends as per ASME B1.20.1

Typical Industrial Applications:

• Steam generating systems: Isolation and flow control in high-temperature steam lines
• Petrochemical plants: Managing hazardous and highly volatile process fluids
• Oil refineries: process Isolation minimizing fugitive emissions
• Hydrogen generating plants: Tight process isolation for hydrogen service
• Chemical processing plants: Corrosive and poisonous process fluids management
• Power plants: Steam distribution and boiler auxiliary systems
• Fertilizer plants: Ammonia and chemical process fluids management
• Gas plants: Isolation of compressed process gases
• Specialty chemical plants: Precise throttling and shut-off of process fluids