Forged Steel Bellows Sealed Valves

Forged Steel Bellows Sealed Valves

  • Body: A105N, LF2, F11, F22, F5, F91, F304, F304L, F304H, F316, F316L, F316H, F321, F347H, F347, F51, F53, F55
  • Sizes: 1/2″ – 4″
  • Design and Manufacturing Standards: API602, ASME B16.34, ASME B16.10
  • Pressure Class: 150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB
  • Quality/Product Certifications: ISO9001, ISO14001, ISO18001, ISO15848, CE
  • Bore: Full Bore, Reduced Bore
  • Connection Types: RF, FM, RTJ, M
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Premium Forged Steel Bellows Sealed Valve by CLDG

The forged steel bellows sealed valve is a high-performance industrial valve engineered for applications requiring zero stem leakage and maximum environmental protection. It is widely utilized in critical systems handling hazardous, toxic, flammable, or expensive fluids, preventing emissions and ensuring operational safety. This valve design is particularly suited for industries where even minimal leakage can have significant consequences, such as in chemical processing, petrochemicals, power generation, and pharmaceuticals. Its robust construction and innovative sealing mechanism set it apart from conventional valve designs.

Its key features include:

  • Bellows Sealing Mechanism

  • Robust Forged Body Construction

  • Secondary Stem Sealing

  • Optimized Flow Path Design

Key Design Features

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Bellows Sealing Mechanism

The core of this valve's design is a hermetically sealed metal bellows that acts as a flexible, pressure-containing barrier between the fluid and the atmosphere. This eliminates the dynamic stem packing typically found in traditional valves, which is a common source of leakage.
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Robust Forged Body Construction

The valve body and bonnet are precision-forged from high-quality steel (e.g., carbon steel, stainless steel, alloy steel). Forging provides a denser, more uniform grain structure compared to casting, resulting in superior mechanical properties, higher pressure resistance, and enhanced resistance to fatigue and thermal shock. This construction ensures exceptional structural integrity and reliability, even in demanding service conditions.
防尘防水密封性强

Secondary Stem Sealing

As an added layer of safety, the valve typically incorporates a secondary conventional packing (e.g., graphite packing) above the bellows. This backup seal provides an additional barrier against leakage in the unlikely event of bellows failure, ensuring continuous containment and preventing emissions. This dual-seal approach offers unparalleled safety and environmental protection.
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Optimized Flow Path Design

The internal flow path is designed for minimal pressure drop and reduced turbulence, contributing to energy efficiency and smooth fluid flow.

Testing and Certification

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Leakage Testing

Every bellows sealed valve undergoes rigorous helium mass spectrometry leak testing to ensure zero external leakage, conforming to international standards like ISO 15848-1.

 

Cycle Testing

Bellows are subjected to extensive cycle testing to verify their operational lifespan and integrity under design conditions.

Pressure Testing

Hydrostatic and pneumatic shell and seat tests are performed in accordance with industry standards (e.g., API 598, EN 12266-1) to confirm pressure containment capabilities.

Material Traceability

All critical components are fully traceable, with material certificates available to ensure compliance with specified standards.

Application Areas

Forged steel bellows sealed valves are indispensable in industries where fugitive emissions are unacceptable, including:

Chemical and Petrochemical Plants: Handling aggressive, corrosive, or toxic chemicals.
Oil and Gas: Preventing hydrocarbon emissions in sensitive areas.
Power Generation: Steam and condensate systems where steam purity and energy efficiency are critical.
Pharmaceuticals: Maintaining sterile environments and preventing cross-contamination.
Thermal Oil Systems: High-temperature applications where conventional packing would degrade rapidly.

Structural Design of Forged Steel Bellows Sealed Valves

Body Disc Stem Be Bonnet Bolt Stem Gland Clan Nut Flat Hand
ASTM-A10F+A276-410+A276-410 SS304 ASTM-A105+A193-B7 Graphite A193-B7 A276-420 #35 A194-2H A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A350-LF2+A276-410+A276-410 SS304 A350-LF2 A320-L7 Graphite A320-L7 A276-420 #35 A194-7 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F11+A276-410+A276-410 SS304 A182-F11 A193-B16 Graphite A193-B16 A276-420 #35 A194-7 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F22+A276-410+A276-410 SS304 A182-F22 A193-B16 Graphite A193-B16 A276-420 #35 A194-7 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F5+A276-410+A276-410 SS304 A182-F5 A193-B16 Graphite A193-B16 A276-420 #35 A194-7 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F91+A276-410+A276-410 SS304 A182-F91 A193-B16 Graphite A193-B16 A276-420 #35 A194-7 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F304+A182-F304+A182-F304 SS304 A182-F304+A193-B8 Graphite A193-B8 A182-F304+A182-F304 A194-8 A194-8 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F304+A182-F304+A182-F304 SS304 A182-F304+A193-B8 Graphite A193-B8 A182-F304+A182-F304 A194-8 A194-8 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F304+A182-F304+A182-F304 SS304 A182-F304+A193-B8 Graphite A193-B8 A182-F304+A182-F304 A194-8 A194-8 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F316+A182-F316+A182-F316 SS316 A182-F316+A193-B8M Graphite A193-B8M A182-F316+A182-F316 A194-8M A194-8M A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F316+A182-F316+A182-F316 SS316 A182-F316+A193-B8M Graphite A193-B8M A182-F316+A182-F316 A194-8M A194-8M A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F316+A182-F316+A182-F316 SS316 A182-F316+A193-B8M Graphite A193-B8M A182-F316+A182-F316 A194-8M A194-8M A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F321+A182-F321+A182-F321 SS304 A182-F321+A193-B8 Graphite A193-B8 A182-F304+A182-F304 A194-8 A194-8 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F347+A182-F347+A182-F347 SS304 A182-F347+A193-B8 Graphite A193-B8 A182-F347+A182-F347 A194-8 A194-8 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F347+A182-F347+A182-F347 SS304 A182-F347+A193-B8 Graphite A193-B8 A182-F347+A182-F347 A194-8 A194-8 A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F51+A182-F51+ A182-F51 SS316 A182-F51+ A193-B8M Graphite A193-B8M A182-F51+A182-F51 A194-8M A194-8M A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F53+A182-F53 A182-F53 SS316 A182-F53 A193-B8M Graphite A193-B8M A182-F53 A182-F53 A194-8M A194-8M A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8
A182-F55+A182-F55 A182-F55 SS316 A182-F55 A193-B8M Graphite A193-B8M A182-F55 A182-F55 A194-8M A194-8M A276-410 A194-2H KTH330-8 A276-410 A194-2H KTH330-8

Structural Design of Forged Steel Bellows Sealed Valves

Size L H W Φd D1 D2 D3 T f n-Φ
150LB 1/2" 108 213 87 10.5 34.9 60.3 90 9.6 2 4-15.9
3/4" 117 221 87 13 42.9 69.9 100 11.2 2 4-15.9
1" 127 242 105 17 50.8 79.4 110 12.7 2 4-15.9
1-1/4" 140 249 146 23 63.5 88.9 115 14.3 2 4-15.9
1-1/2" 165 320 146 29 73 98.4 125 15.9 2 4-15.9
2" 178 365 160 36 92.1 120.7 150 17.5 2 4-19
300LB 1/2" 140 213 87 10.5 34.9 66.7 95 12.7 2 4-15.9
3/4" 152 221 87 13 42.9 82.6 115 14.3 2 4-19
1" 165 242 105 17 50.8 88.9 125 15.9 2 4-19
1-1/4" 178 249 146 23 63.5 98.4 135 17.5 2 4-19
1-1/2" 190 320 146 29 73 114.3 155 19.1 2 4-22.225
2" 216 365 160 36 92.1 127 165 20.7 2 8-19
600LB 1/2" 165 213 87 10.5 34.9 66.7 95 14.3 7 4-15.9
3/4" 190 221 87 13 42.9 82.6 115 15.9 7 4-19
1" 216 242 105 17 50.8 88.9 125 17.5 7 4-19
1-1/4" 229 249 146 23 63.5 98.4 135 20.7 7 4-19
1-1/2" 241 320 146 29 73 114.3 155 22.3 7 4-22.225
2" 292 365 160 36 92.1 127 165 25.4 7 8-19

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